WO2010140291A1

WO2010140291A1 - Information processing device

Info

Publication number: WO2010140291A1
Application number: PCT/JP2010/002565
Authority: WO
Inventors: 吉坂主旬
Original assignee: 日本電気株式会社
Priority date: 2009-06-02
Filing date: 2010-04-08
Publication date: 2010-12-09

Abstract

An information processing device (100) obtains (101), based on image information that indicates an image that includes a character-color domain and a background-color domain, character-size information that indicates the size of characters, which is indicated by the character-color domain of the image. The information processing device (100) also obtains (102) character-color information that indicates above-mentioned character-color, and background-color information that indicates above-mentioned background-color. The information processing device also obtains (103) a readability parameter, which has a value that becomes greater, as the possibility of a viewer of above-mentioned image being able to read above-mentioned character becomes higher, based on the obtained character-size information, and the obtained character-color and background-color information. Furthermore, the information processing device outputs (103) readability-deciding information that indicates whether the obtained readability parameter is greater than a predetermined standard value.

Description

Information processing device

The present invention relates to an information processing apparatus that estimates whether or not a viewer of an image can read characters in the image.

In general, an image viewer can read a character represented by a character color region in an image including a character color region colored in a character color and a background color region colored in a background color other than the character color. Is known to have a strong correlation with the contrast ratio based on the brightness of the character color and the brightness of the background color.

Therefore, W3C (World Wide Web Consortium) is a method for calculating the contrast ratio in WCAG (Web Contents Accessibility Guidelines) version 1.0 and version 2.0 (Non-patent Document 1), and the viewer of the image changes the text. It defines a reference value (reference value) for the contrast ratio set so that it can be read sufficiently. Further, it is known that the visual specification differs for each viewer due to the individual characteristics or age of the viewer. Therefore, in WCAG, the reference value is changed according to the visual characteristics of the viewer.

By the way, an information processing apparatus that estimates whether or not a viewer of an image can read characters in the image based on such rules is known (Non-Patent Document 2). Further, as one of this type of information processing apparatus, the information processing apparatuses described in Patent Document 1 and Patent Document 2 are based on the character color and the background color, and readability parameters (for example, the difference in brightness between the character color and the background color). ) Is calculated. Then, the information processing apparatus estimates whether or not the image viewer can read the characters in the image by determining whether or not the calculated readability parameter is larger than the reference value.

JP 2005-260404 A JP 2003-209704 A

By the way, the larger the size of the character in the image, the higher the possibility that the viewer of the image can read the character. However, the information processing apparatus estimates whether or not the image viewer can read the characters in the image based only on the character color and the background color. Therefore, the information processing apparatus has a problem that the same estimation is performed even if the character size is different unless the combination of the character color and the background color is changed.
That is, according to the information processing apparatus, there is a problem in that it is impossible to estimate with high accuracy whether or not an image viewer can read characters in the image.

For this reason, the object of the present invention is to solve the above-mentioned problem that “the viewer of the image may not be able to estimate with high accuracy whether or not the characters in the image can be read”. It is an object of the present invention to provide an information processing apparatus capable of performing the above.

In order to achieve such an object, an information processing apparatus according to an aspect of the present invention provides:
Based on image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color, the size of the character represented by the character color region in the image Character size information acquisition means for acquiring character size information representing
Color information acquisition means for acquiring character color information representing the character color and background color information representing the background color based on the image information;
Based on the acquired character size information and the acquired character color information and background color information, the readability has a value that increases as the possibility that the viewer of the image can read the character increases. Readability determination information output means for acquiring a parameter and outputting readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value;
Is provided.

In addition, an information processing method according to another aspect of the present invention includes:
Based on image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color, the size of the character represented by the character color region in the image Get character size information that represents
Based on the image information, obtain character color information representing the character color and background color information representing the background color,
Based on the acquired character size information and the acquired character color information and background color information, the readability has a value that increases as the possibility that the viewer of the image can read the character increases. This is a method of acquiring a parameter and outputting readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value.

Moreover, the program which is the other form of this invention is:
In the information processing device,
Based on image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color, the size of the character represented by the character color region in the image Character size information acquisition means for acquiring character size information representing
Color information acquisition means for acquiring character color information representing the character color and background color information representing the background color based on the image information;
Based on the acquired character size information and the acquired character color information and background color information, the readability has a value that increases as the possibility that the viewer of the image can read the character increases. Readability determination information output means for acquiring a parameter and outputting readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value;
It is a program for realizing.

The present invention is configured as described above, so that it can be estimated with high accuracy whether or not the viewer of the image can read the characters in the image.

It is a block diagram showing the outline of the function of the information processing apparatus which concerns on 1st Embodiment of this invention. It is an example of the image used as the object of a process. FIG. 3 is a diagram showing an image binarized into white and black based on a gray gradation value of 128 for the image shown in FIG. 2. FIG. 3 is a diagram showing an image binarized into white and black based on a gray gradation value 192 for the image shown in FIG. 2. It is the figure which showed the image which reversed the black-and-white image shown in FIG. 3 in black and white. FIG. 5 is a diagram illustrating an image obtained by reversing the binary image illustrated in FIG. 4 in black and white. It is the example which showed the binarized image and the coordinate of the black dot extracted from the binarized image. It is the figure which showed the rectangular area extracted from the image shown in FIG. It is the figure which showed the rectangular area extracted from the image shown in FIG. It is the figure which showed the rectangular area extracted from the image shown in FIG. It is the figure which showed the rectangular area extracted from the image shown in FIG. It is the figure which showed the rectangular area extracted from the image shown in FIG. FIG. 13 is a diagram showing a result of integrating the rectangular areas shown in FIGS. 9 to 12; It is the figure which showed the character background combination information containing the coordinate of a rectangular area, character color, background color, and the size of a character. It is the figure which showed the contrast determination result information containing the coordinate of a rectangular area, a character color, a background color, the size of a character, and a determination result. It is the figure which showed the image which superimposed the rectangle showing a rectangular area, and the determination result on the image used as a process target. It is an example of the image used as the object of a process. It is the figure which showed the rectangular area extracted from the image shown in FIG. 17 by the information processing apparatus which concerns on 2nd Embodiment of this invention. It is the figure which showed the square rectangular area produced | generated from the rectangular area shown in FIG. It is the figure which showed the result of having integrated the rectangular area based on the square rectangular area shown in FIG. It is explanatory drawing which showed notionally the rectangular area before integration, and the rectangular area after integration, when the information processing apparatus which concerns on 2nd Embodiment of this invention integrates a rectangular area. It is the figure which showed the image which superimposed the rectangle showing a rectangular area, and the determination result on the image used as a process target. It is the figure which showed the rectangular area integrated based on the square rectangular area shown in FIG. 19 by the information processing apparatus which concerns on 3rd Embodiment of this invention. It is explanatory drawing which showed notionally the rectangular area before integration, and the rectangular area after integration, when the information processing apparatus which concerns on 3rd Embodiment of this invention integrates a rectangular area. It is an image displayed by the information processor concerning a 4th embodiment of the present invention, and is an image showing the judgment result of contrast ratio with respect to each of a plurality of combinations of character color and background color. It is a block diagram showing the outline of the function of the information processing apparatus which concerns on 5th Embodiment of this invention.

Hereinafter, embodiments of an information processing apparatus, an information processing method, and a program according to the present invention will be described with reference to FIGS.

<First Embodiment>
(Constitution)
As shown in FIG. 1, the information processing apparatus 1 according to the first embodiment includes a central processing unit (CPU; Central Processing Unit), a storage device (memory and hard disk drive (HDD)), not shown. An input device and an output device are provided.

The output device has a display. The output device displays an image made up of characters, graphics, and the like on the display based on the image information output from the CPU. The input device has a keyboard and a mouse. The information processing apparatus 1 is configured such that information based on user operations is input via a keyboard and a mouse.

FIG. 1 is a block diagram illustrating functions of the information processing apparatus 1 configured as described above. This function is realized by the CPU of the information processing apparatus 1 executing a predetermined program stored in the storage device.
The functions of the information processing apparatus 1 are a character background recognition unit (character size information acquisition unit, color information acquisition unit) 11, a contrast determination unit (part of readability determination information output unit) 12, and a determination result output unit (readability). A part of determination information output means) 13.

The character background recognition unit 11 receives image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color.

Here, the image information may be information (image file) according to a bitmap format or a GIF format, or information (for example, HTML (HyperText Markup Language) based on an image drawn on the display. And information expressed in a language such as JavaScript (registered trademark). Moreover, the information memorize | stored in VRAM (Video RAM) with which the information processing apparatus 1 is provided may be sufficient.

Based on the received image information, the character background recognition unit 11 is a region including a character color region representing a character, and is arranged so that each side is in contact with the boundary between the character color region and the background color region. Identify a rectangular area (rectangular area).

The character background recognition unit 11 acquires, for each specified rectangular area, character color information representing the character color in the rectangular area and background color information representing the background color in the rectangular area. Furthermore, the character background recognition unit 11 acquires character size information representing the size of the character in the rectangular area based on the size of the rectangular area for each specified rectangular area. In this example, the character background recognition unit 11 includes the length (height) in the vertical direction (Y-axis direction) of the rectangular area and the length (width) in the horizontal direction (X-axis direction) of the rectangular area. Then, information representing the larger length is acquired as character size information.

Specifically, the character background recognition unit 11 sets a value representing a color included in the image represented by the received image information as a first value (in this example, a value representing black) and a second value (in this example). , A value representing white) is performed. And the character background recognition part 11 specifies the area | region colored in the color which 1st value represents as a character color area | region. On the other hand, the character background recognition unit 11 identifies an area colored in the color represented by the second value as the background color area. Next, the character background recognition unit 11 identifies a rectangular area based on the identified character color area.

Then, the character background recognition unit 11 extracts a set of rectangular areas that satisfy a predetermined set condition from the specified rectangular areas. Here, the set condition is that any one of the rectangular areas constituting each set and at least one of the other rectangular areas constituting the set are adjacent to each other in either the vertical direction or the horizontal direction. It is a condition of being. Then, for each set of extracted rectangular areas, the character background recognizing unit 11 includes all of the rectangular areas constituting the set instead of the rectangular areas constituting the set, and each side includes the rectangular area. A rectangular area including any of the sides is specified.

Further, the character background recognizing unit 11 uses, as character color information of the rectangular area, information representing a value obtained by averaging values representing colors in the character color area for each rectangular area in the image represented by the received image information. get. Similarly, the character background recognizing unit 11 uses, for each rectangular area in the image represented by the received image information, information representing a value obtained by averaging values representing colors in the background color area as background color information of the rectangular area. Get as.

The contrast determination unit 12 reads the readability parameter based on the character size information, the character color information, and the background color information acquired by the character background recognition unit 11 for each rectangular area specified by the character background recognition unit 11. To get.

The readability parameter has a value that increases as the viewer of the image represented by the image information received by the character background recognition unit 11 can read the characters in the image. In this example, the contrast determination unit 12 calculates a contrast ratio based on the relative luminance of the character color and the relative luminance of the background color, and acquires the calculated contrast ratio as a readability parameter. To do.

Then, the contrast determination unit 12 determines whether or not the acquired readability parameter is larger than a preset reference value. The contrast determination unit 12 increases the character size represented by the character size information acquired by the character background recognition unit 11 as a reference value for each rectangular area specified by the character background recognition unit 11. Use a smaller value.

The determination result output unit 13 is information indicating a result determined by the contrast determination unit 12 for each of the rectangular areas specified by the character background recognition unit 11 (that is, whether the readability parameter is larger than a reference value). Is displayed (output) on the display.

(Operation)
Next, the operation of the information processing apparatus 1 described above will be specifically described.
First, the character background recognition unit 11 receives image information. Next, the character background recognition unit 11 performs the binarization process on the received image information. In this example, the binarization process includes RGB values of each dot in the image represented by the image information (a value “R” representing red, a value “G” representing green, a value “B” representing blue, ) And the formula (0.299 × R + 0.587 × G + 0.114 × B), a value representing the gray gradation of the dot (pixel) is calculated.

In the binarization process, when the calculated value is less than a threshold value (for example, 128), the RGB value of the dot is set to R = G = B = 0 (that is, the RGB value representing black), If it is equal to or greater than the threshold, the RGB value of the dot is set to R = G = B = 255 (that is, the RGB value representing white). Thereby, an image (binarized image) having only RGB values representing black or RGB values representing white as RGB values is generated.

For example, when the above-described binarization process is performed on the image shown in FIG. 2, the image shown in FIG. 3 is obtained. Furthermore, not only the above-described binarization method but also the character background recognition unit 11 performs another binarization process. In the binarization process, three images are generated by using the R, G, and B values constituting the RGB values as values representing the gray gradation. Further, in the binarization process, as in the binarization process described above, the RGB value of each dot is set to an RGB value representing black or an RGB value representing white for each image. Thereby, a binarized image is generated.

Further, the character background recognition unit 11 generates a plurality of binarized images by using a plurality of values (for example, 128 and 192) as the threshold value. Thereby, the precision which detects a character from an image can be raised. For example, when the image shown in FIG. 2 is subjected to binarization processing using 192 as a threshold, the image shown in FIG. 4 is obtained.

Then, the character background recognizing unit 11 sets the RGB value of each dot to black for each of a plurality of binarized images generated by using a plurality of threshold values. On the other hand, if it is an RGB value representing black, it is converted to an RGB value representing white (that is, black and white are inverted). Thereby, a binarized image is generated. For example, the image shown in FIG. 5 is an image obtained by reversing the image shown in FIG. 3 in black and white, and the image shown in FIG. 6 is an image obtained by reversing the image shown in FIG. 4 in black and white.

In this way, the character background recognition unit 11 generates a plurality of binarized images based on the received image information.

Next, the character background recognition unit 11 specifies a rectangular area for each of the generated plurality of binarized images (extracts the rectangular area).

First, the character background recognizing unit 11 performs, for each binarized image, the position (XY coordinates (X, Y) of a dot (black dot) having an RGB value representing black, where X and Y are Information (coordinate information) representing (integer) is extracted. For example, in the case of the image shown in FIG. 7, the character background recognition unit 11 extracts the coordinate information of the black dots as shown in FIG.

Next, based on the extracted black dot coordinate information, the character background recognizing unit 11 identifies a black dot region adjacent in one of the vertical direction, the horizontal direction, and the diagonal direction as a character color region. . For example, when the first coordinate information is (X ₁ , Y ₁ ) and the second coordinate information is (X ₂ , Y ₂ ), X ₁ −1 ≦ X ₂ ≦ X ₁ +1, or Y When the relationship ₁ −1 ≦ Y ₂ ≦ Y ₁ +1 is satisfied, the black dot of the first coordinate information and the black dot of the second coordinate information are in the vertical direction, the horizontal direction, and the diagonal direction. Adjacent in either direction.

The character background recognition unit 11 identifies a rectangular area based on the identified character color area. In this example, character background recognition unit 11 of the coordinates of black dots included in a character color region, and the minimum value X _min of the X value (value of X-coordinate), and a maximum value X _max X value, The minimum value Y _min of the Y value (Y coordinate value) and the maximum value Y _max of the Y value are acquired as information for specifying the rectangular area. That is, the coordinates of the four vertices of the rectangular area are (X _min , Y _min ), (X _min , Y _max ), (X _max , Y _min ), and (X _max , Y _max ).

The character background recognition unit 11 stores the information for specifying each rectangular area and the coordinate information of the black dots included in the rectangular area in the storage device in association with each binarized image.

FIG. 8 shows the information for specifying each rectangular area acquired by the character background recognition unit 11 for the binarized image shown in FIG. 7 and the coordinate information of the black dots included in the rectangular area. Show.

The image shown in FIG. 9 shows a rectangular area extracted from the image shown in FIG. Further, the image shown in FIG. 10 shows a rectangular area extracted from the image shown in FIG. Similarly, the image shown in FIG. 11 shows a rectangular area extracted from the image shown in FIG. Similarly, the image shown in FIG. 12 shows a rectangular area extracted from the image shown in FIG.

Furthermore, the character background recognition unit 11 calculates the width and height of the specified rectangular area. Specifically, the character background recognition unit 11 determines the magnitude of the difference between the minimum X value X _min and the maximum X value X _max of the coordinates of the vertices of the rectangular area. Calculate as width. Similarly, the character background recognition unit 11 determines the difference between the minimum Y value Y _min and the maximum Y value Y _max among the coordinates of the vertices of the rectangular area. Calculate as

Then, the character background recognition unit 11 deletes information for specifying a rectangular area having a calculated width or height larger than 100 dots (pixels) from the storage device. Similarly, the character background recognition unit 11 erases information for specifying a rectangular area having a calculated width or height of 3 dots or less from the storage device.

Next, when the specified rectangular areas are adjacent to each binarized image, the character background recognition unit 11 integrates the rectangular areas into one rectangular area. Specifically, the character background recognition unit 11 extracts a set of rectangular areas that satisfy a predetermined set condition from the specified rectangular areas. Here, the set condition is that any one of the rectangular areas constituting each set and at least one of the other rectangular areas constituting the set are adjacent to each other in either the vertical direction or the horizontal direction. It is a condition of being.

Then, for each set of extracted rectangular areas, the character background recognizing unit 11 includes all of the rectangular areas constituting the set instead of the rectangular areas constituting the set, and each side has the rectangular area. A rectangular area including any of the sides is specified.

That is, the character background recognizing unit 11 has the minimum value X _min of the X value, the maximum value X _max of the X value, and the minimum value Y _{min of the} Y value among the coordinates of the vertices of each rectangular area constituting the set. And the maximum value Y _max of the Y values are acquired as the coordinates of the new rectangular area. At this time, the character background recognizing unit 11 acquires all the coordinate information of the black dots included in each rectangular area constituting the set as the coordinate information of the black dots included in the new rectangular area.

Then, the character background recognition unit 11 erases information for specifying each rectangular area constituting the set from the storage device and stores information for specifying a new rectangular area in the storage device.

Next, the character background recognition unit 11 integrates the rectangular areas specified for each binarized image. Specifically, the character background recognition unit 11 extracts a set of rectangular areas that satisfy a predetermined set condition from the rectangular areas specified for an arbitrary binary image. Here, the set condition includes a portion where any one of the rectangular areas constituting each set and at least one of the other rectangular areas constituting the set overlap each other (including a common area). This is the condition. Note that the rectangular areas constituting each set are rectangular areas specified for different binary images.

That is, the character background recognizing unit 11 has the minimum value X _min of the X value, the maximum value X _max of the X value, and the minimum value Y _{min of the} Y value among the coordinates of the vertices of each rectangular area constituting the set. And the maximum value Y _max of the Y values are acquired as the coordinates of the new rectangular area. At this time, the character background recognition unit 11 acquires all the coordinate information of the black dots included in each rectangular area constituting the above set, and newly sets the coordinate information from which the overlapping coordinate information of the acquired coordinate information is deleted. Obtained as coordinate information of black dots included in a rectangular area.

In this way, the character background recognition unit 11 identifies a rectangular area as shown in FIG. 13 based on the image shown in FIG.

Next, for each specified rectangular area, the character background recognition unit 11 calculates the RGB value of the image represented by the received image information at the coordinates of the black dots included in the rectangular area. Is obtained as character color information representing the character color (color information acquisition step).

Similarly, for each specified rectangular area, the character background recognizing unit 11 calculates the RGB value of the image represented by the received image information at the coordinates of the white dots included in the rectangular area. Is obtained as background color information representing the background color (color information obtaining step).

In addition, the character background recognition unit 11 calculates the width and height of the rectangular area for each specified rectangular area. Specifically, the character background recognition unit 11 determines the magnitude of the difference between the minimum X value X _min and the maximum X value X _max of the coordinates of the vertices of the rectangular area. Calculate as width. Similarly, the character background recognition unit 11 determines the difference between the minimum Y value Y _min and the maximum Y value Y _max among the coordinates of the vertices of the rectangular area. Calculate as

Then, the character background recognition unit 11 sets, for each of the specified rectangular areas, the larger value of the calculated width and height as a character representing the size of the character included in the rectangular area. Obtained as size information (character size information obtaining step).

Next, the character background recognition unit 11 associates information (vertex coordinate information) for identifying a rectangular area, the acquired character color information and background color information, and the acquired character size information. The background combination information is output to the contrast determination unit 12. FIG. 14 is a diagram showing an example of character background combination information.

Note that the character background recognition unit 11 may be configured to acquire the character background combination information using another method within a range in which similar character background combination information can be output.

Next, the contrast determination unit 12 receives the character background combination information output by the character background recognition unit 11. Then, the contrast determination unit 12 calculates the relative luminance L of the character color based on the character color information and the following equation (1) for each rectangular area included in the received character background combination information. Similarly, the contrast determination unit 12 calculates the relative luminance L of the background color for each rectangular area based on the background color information and the following equation (1). The contrast determination unit 12 may be configured to calculate the relative luminance using another formula different from the following formula (1).
L = 0.2125 × ((R / 255) ^2.2 ) + 0.7152 × ((G / 255) ^2.2 ) + 0.0722 × ((B / 255) ^2.2 )… (1)

Then, the contrast determination unit 12 calculates the contrast ratio based on the calculated relative luminance L of the character color, the calculated relative luminance L of the background color, and the following equation (2) for each rectangular area. R is calculated (readability determination information output step).
R = (L ₁ +0.05) / (L ₂ +0.05) (2)

Here, the value L ₁ is the larger value of the calculated relative luminance L of the character color and the calculated relative luminance L of the background color, and the value L ₂ is the calculated character color. It is the smaller value of the relative luminance L and the calculated relative luminance L of the background color.

The contrast determination unit 12 determines whether or not the calculated contrast ratio R is greater than a preset reference value. Here, when the size of the character represented by the character size information is less than 18 pixels, the contrast determination unit 12 uses the first value (4.5 in this example) as the reference value, and the character size information When the size of the character represented by is 18 pixels or more, the second value (3 in this example) smaller than the first value is used as the reference value. The contrast determination unit 12 may use 7 as the first value and 4.5 as the second value.

That is, the contrast determination unit 12 increases the character size represented by the character size information acquired by the character background recognition unit 11 as a reference value for each of the rectangular areas specified by the character background recognition unit 11. A smaller value is used.

Then, the contrast determination unit 12 adds the information indicating the determination result (that is, information indicating whether the contrast ratio R is larger than the reference value, the determination result) to the received character background combination information. The determination result information is output to the determination result output unit 13. FIG. 15 is a diagram illustrating an example of contrast determination result information. “True” represents that the contrast ratio R is larger than the reference value, and “false” represents that the contrast ratio R is smaller than the reference value.

Next, the determination result output unit 13 receives the contrast determination result information output by the contrast determination unit 12. And the determination result output part 13 displays the received contrast determination result information (readability determination information) on a display (readability determination information output process).

As described above, according to the first embodiment of the information processing apparatus of the present invention, the information processing apparatus 1 provides the readability determination information based on the character size in addition to the character color and the background color. Output. That is, the information processing apparatus 1 estimates whether or not the image viewer can read the characters in the image based on the character color, the background color, and the character size. As a result, according to the information processing apparatus 1, it is possible to estimate with high accuracy whether or not the viewer of the image can read the characters in the image.

Furthermore, according to the first embodiment, the information processing apparatus 1 determines that the larger the character size, the smaller the contrast ratio (readability parameter), the smaller the reference value. That is, according to the information processing apparatus 1, it is possible to estimate with high accuracy whether or not a viewer of an image can read characters in the image.

Note that the information processing apparatus 1 uses “◯” instead of “true” and “x” instead of “false” as information indicating whether or not the contrast ratio R is larger than the reference value. Also good. Further, the information processing apparatus 1 may be configured to calculate the ratio of the number of rectangular areas determined that the contrast ratio R is larger than the reference value with respect to the total number of rectangular areas, and to output the calculated ratio. Good.

The determination result output unit 13 associates the identified rectangular area with information indicating whether the contrast ratio R calculated for the rectangular area is larger than the reference value, and recognizes the character background. It may be configured to display together with the image represented by the image information received by the unit 11.

In this case, the determination result output unit 13 draws a rectangle representing a rectangular area based on the contrast determination result information output by the contrast determination unit 12. Further, based on the contrast determination result information, the determination result output unit 13 draws the information indicating whether or not the contrast ratio R is larger than the reference value (in this example, “◯” or “×”). Draw near the rectangle. For example, when the image information representing the image shown in FIG. 2 is received by the character background recognition unit 11, the determination result output unit 13 displays the image shown in FIG. 16 on the display.

According to this, the user of the information processing apparatus 1 can easily recognize, for each character in the image, whether or not it is highly likely that the viewer of the image can read the character. That is, the convenience of the user of the information processing apparatus 1 can be improved.

Note that the determination result output unit 13 uses information such as an arrow or a bracket and / or changes color to indicate whether the contrast ratio R is greater than a reference value, and the information. It may be configured to show the relationship with the rectangular area that is the target of the above. Furthermore, the determination result output unit 13 may use symbols or characters other than “◯” and “x” as information indicating whether or not the contrast ratio R is larger than the reference value. Further, the determination result output unit 13 is configured to indicate whether or not the contrast ratio R is larger than the reference value by the color of the rectangular line representing the rectangular area, the type of the line, and / or the thickness of the line. May be.

Second Embodiment
Next, an information processing apparatus according to the second embodiment of the present invention will be described. The information processing apparatus according to the second embodiment includes a plurality of information processing apparatuses arranged in a straight line along a predetermined alignment direction (vertical direction or horizontal direction) with respect to the information processing apparatus according to the first embodiment. The difference is that readability determination information is output for each region including characters (characters constituting a row or a column). Accordingly, the following description will focus on such differences.

The character background recognition unit 11 of the information processing apparatus 1 according to the second embodiment specifies a rectangular area by the same processing as the character background recognition unit 11 according to the first embodiment. For example, the character background recognition unit 11 specifies a rectangular area as shown in FIG. 18 based on the image shown in FIG.

Then, the character background recognition unit 11 generates a square rectangular area for each of the specified rectangular areas. The square rectangular area is a square area having a value obtained by dividing the sum of the height of the rectangular area and the width of the rectangular area by 2 as the length of one side and centering on the same position as the center of the rectangular area. For example, the character background recognition unit 11 generates a square rectangular area as shown in FIG. 19 based on the rectangular area shown in FIG.

Next, the character background recognition unit 11 extracts a set of square rectangular areas that satisfy a predetermined set condition from the plurality of generated square rectangular areas. Here, the set conditions include the following first condition to fourth condition for any one of the square rectangular areas constituting each set and at least one of the other square rectangular areas constituting the set. It is a condition that either of the above is true.

The first condition is that one square rectangular area and the other square rectangular area have portions that overlap each other (including a common area).
The second condition is a condition that one square rectangular area includes the whole of the other square rectangular area.

The third condition is that one side of one square rectangular area is adjacent to at least a part of one side of the other square rectangular area.
The fourth condition is that the distance in the alignment direction between the two square rectangular areas is equal to or less than a predetermined threshold distance, and at least part of the range of the two square rectangular areas in the direction orthogonal to the alignment direction is common. It is a condition of being. Here, the threshold distance is a value obtained by multiplying a value obtained by averaging the lengths of the sides of both square rectangular areas by a preset value (in this example, ¼).

Then, for each set of extracted square rectangular areas, the character background recognizing unit 11 replaces each square rectangular area constituting the set with all the rectangular areas that are the basis of the square rectangular areas constituting the set. And a rectangular area in which each side includes any one of the rectangular areas. For example, the character background recognition unit 11 specifies the rectangular area shown in FIG. 20 based on the square rectangular area shown in FIG. FIG. 21 is an explanatory diagram conceptually showing a rectangular area constituting the set and a newly specified rectangular area.

That is, the character background recognizing unit 11 determines the minimum X value X _min and the maximum X value X _max of the coordinates of the vertices of the rectangular area that is the basis of each square rectangular area constituting the set. , Y value minimum value Y _min and Y value maximum value Y _max are acquired as coordinates of a new rectangular area. At this time, the character background recognition unit 11 acquires all of the black dots included in the rectangular area that is the basis of each square rectangular area constituting the set, and deletes the overlapping coordinate information from the acquired coordinate information. The obtained coordinate information is acquired as the coordinate information of the black dots included in the new rectangular area.

Then, the character background recognition unit 11 deletes information for specifying the rectangular area that is the basis of each square rectangular area constituting the set from the storage device, and also specifies information for specifying a new rectangular area. Store in a storage device.

In this way, the character background recognition unit 11 identifies a character-containing region including a plurality of character color regions representing a plurality of characters arranged in a straight line along the alignment direction as a rectangular area. Here, the character-containing region has a predetermined distance in the alignment direction between an arbitrary character color region included in the character-containing region and any other character color region included in the character-containing region. It is set to be equal to or less than the threshold distance. That is, when an area in which a row or a column is constituted by a plurality of characters exists in the image, a rectangular area including a plurality of characters constituting the row or column is generated.

Therefore, the rectangular area specified by the character background recognition unit 11 is an area that includes all of the character color areas that represent a plurality of characters arranged in a straight line along the alignment direction, and each side has their side. This is a rectangular area arranged so as to be in contact with the boundary between the character color area and the background color area.

Then, the character background recognition unit 11 calculates the width and height of the rectangular area for each specified rectangular area. Next, the character background recognizing unit 11 determines, for each of the specified rectangular areas, the length of the rectangular area in the direction perpendicular to the alignment direction with respect to the rectangular area out of the calculated width and height (that is, If the alignment direction is the horizontal direction, the height of the rectangular area, and if the alignment direction is the vertical direction, the width of the rectangular area), the character size that represents the size of the characters included in the rectangular area Obtain as information.

That is, the character background recognition unit 11 acquires, as character size information, representative character size information representing a representative value representing the size of a plurality of characters included in the specified rectangular area. Can be said. Further, it can be said that the character background recognizing unit 11 uses the size of the character having the maximum size among the plurality of characters as the representative value.

Then, the contrast determination unit 12 calculates the contrast ratio R for each of the rectangular areas specified as the character-containing areas, as in the first embodiment, and the calculated contrast ratio R is larger than the reference value. It is determined whether or not.

Then, the contrast determination unit 12 outputs contrast determination result information including information indicating the determination result to the determination result output unit 13. Next, the determination result output unit 13 displays the contrast determination result information output by the contrast determination unit 12 on the display.

As described above, according to the second embodiment of the information processing apparatus according to the present invention, the same operations and effects as those of the first embodiment can be achieved.
Furthermore, according to the second embodiment, when a plurality of characters are arranged side by side, the sizes of the plurality of characters are different from each other (for example, the plurality of characters are “ka” or “Ao”). In some cases, the size of a plurality of characters can be handled as the same size (the same font size).

In this case, the determination result output unit 13 draws a rectangle representing a rectangular area based on the contrast determination result information output by the contrast determination unit 12. Further, based on the contrast determination result information, the determination result output unit 13 draws the information indicating whether or not the contrast ratio R is larger than the reference value (in this example, “◯” or “×”). Draw near the rectangle. For example, when the image information representing the image shown in FIG. 2 is received by the character background recognition unit 11, the determination result output unit 13 displays the image shown in FIG. 22 on the display.

<Third Embodiment>
Next, an information processing apparatus according to the third embodiment of the present invention will be described. The information processing apparatus according to the third embodiment has the smallest size among a plurality of characters arranged in a straight line along the alignment direction with respect to the information processing apparatus according to the second embodiment. The difference is that character size information representing the size of the character is acquired. Accordingly, the following description will focus on such differences.

The character background recognition unit 11 of the information processing apparatus 1 according to the third embodiment specifies a rectangular area by the same process as the character background recognition unit 11 according to the second embodiment. For example, the character background recognition unit 11 specifies a rectangular area as shown in FIG. 18 based on the image shown in FIG.

And the character background recognition part 11 produces | generates a square rectangular area with respect to each of the specified rectangular area similarly to the said 2nd Embodiment. For example, the character background recognition unit 11 generates a square rectangular area as shown in FIG. 19 based on the rectangular area shown in FIG.

Next, as in the second embodiment, the character background recognition unit 11 extracts a set of square rectangular areas that satisfy a predetermined set condition from the plurality of generated square rectangular areas.

Then, for each set of extracted square rectangular areas, the character background recognizing unit 11 replaces each square rectangular area that constitutes the set with one rectangular area that is the basis of the square rectangular area that constitutes the set. Identify the rectangular area that contains the part. For example, the character background recognition unit 11 identifies the rectangular area shown in FIG. 23 based on the square rectangular area shown in FIG. FIG. 24 is an explanatory diagram conceptually showing a rectangular area constituting the set and a newly specified rectangular area.

That is, the character background recognizing unit 11 determines the minimum X value X _min and the maximum X value X _max of the coordinates of the vertices of the rectangular area that is the basis of each square rectangular area constituting the set. , Y value minimum value Y _min and Y value maximum value Y _max are acquired. Then, the character background recognizing unit 11 calculates the difference (that is, the width of the virtual rectangular area) between the minimum value X _min of the acquired X value and the maximum value X _max of the acquired X value. Further, the character background recognizing unit 11 calculates a difference (that is, the height of the virtual rectangular area) between the minimum value Y _min of the acquired Y value and the maximum value Y _max of the acquired Y value.

When the calculated height of the virtual rectangular area is smaller than the calculated width of the virtual rectangular area (that is, the characters in the virtual rectangular area are arranged in the horizontal direction), the character background recognizing unit 11 The minimum value Y _min of the Y value and the maximum value Y _max of the Y value among the coordinates of the vertices of the rectangular area having the minimum height among the rectangular areas that form the square rectangular areas constituting The minimum X value X _min and the maximum X value X _max of the coordinates of the vertices of all the rectangular areas that are the basis of each square rectangular area constituting the set are acquired as the coordinates of the new rectangular area. To do.

On the other hand, when the calculated height of the virtual rectangular area is larger than the calculated width of the virtual rectangular area (that is, the characters in the virtual rectangular area are arranged in the vertical direction), each square constituting the above set the maximum value X _max of the minimum value X _min and X values of X values of the vertexes of the rectangle area coordinates with a minimum width of the rectangular area is the basis of the rectangular area, each square constituting the set The minimum Y value Y _min and the maximum Y value Y _max of the coordinates of the vertices of all the rectangular areas that are the basis of the rectangular area are acquired as the coordinates of the new rectangular area.

That is, the character background recognition unit 11 represents the length of the character having the minimum length in the direction orthogonal to the alignment direction among the plurality of characters arranged in a straight line along the alignment direction. Information is acquired as character size information.

At this time, the character background recognition unit 11 acquires coordinate information of the black dots included in the new rectangular area among the black dots included in the rectangular area that is the basis of each square rectangular area constituting the set. The coordinate information obtained by deleting the overlapping coordinate information in the acquired coordinate information is acquired as the coordinate information of the black dots included in the new rectangular area.

That is, the character background recognition unit 11 acquires, as character size information, representative character size information representing a representative value representing the size of a plurality of characters included in the specified rectangular area. Can be said. Furthermore, it can be said that the character background recognition unit 11 uses the size of the character having the smallest size among the plurality of characters as the representative value.

<Fourth embodiment>
Next, an information processing apparatus according to the fourth embodiment of the present invention will be described. The information processing apparatus according to the fourth embodiment has a plurality of character color information representing an arbitrary character color and background color information representing an arbitrary background color with respect to the information processing apparatus according to the first embodiment. The difference is that information indicating whether the contrast ratio R is larger than the reference value is output for each combination. Accordingly, the following description will focus on such differences.

The contrast determination unit 12 according to the fourth embodiment includes a plurality of combinations of character color information representing an arbitrary character color and background color information representing an arbitrary background color (in this example, each of the character color and the background color). The contrast ratio R is calculated for a combination of 32 values of RGB values changed by 32).

Furthermore, the contrast determination unit 12 calculates the above for each rectangular area specified by the character background recognition unit 11 from the reference value determined according to the character size information acquired for the rectangular area. It is determined whether the contrast ratio R is large.

Then, the determination result output unit 13 causes the display to display information indicating whether the contrast ratio R is larger than the reference value for each of the plurality of combinations. For example, for each combination, the determination result output unit 13 “has a sufficient contrast ratio without changing the character size”, “has a sufficient contrast ratio when the character size is changed”, or , Information indicating that “a sufficient contrast ratio cannot be obtained even if the character size is changed” is output.

In this example, as shown in FIG. 25, the determination result output unit 13 draws “−” as information indicating that the contrast ratio is insufficient, and the contrast ratio is sufficient if the character size is changed. “Δ” is drawn as information indicating that the Note that the determination result output unit 13 may use other symbols or the like.

As described above, the fourth embodiment of the information processing apparatus according to the present invention can provide the same operations and effects as the first embodiment.
Furthermore, according to the said 4th Embodiment, the user of the information processing apparatus 1 may be able to read a character by the viewer of an image by using any combination as a combination of a character color and a background color. Whether it is sufficiently high can be easily recognized. That is, the convenience of the user of the information processing apparatus 1 can be improved.

<Fifth Embodiment>
Next, an information processing apparatus according to the fifth embodiment of the present invention will be described with reference to FIG.
An information processing apparatus 100 according to the fifth embodiment includes a character size information acquisition unit (character size information acquisition unit) 101, a color information acquisition unit (color information acquisition unit) 102, and a readability determination information output unit (readability determination information output). Means) 103.

The character size information acquisition unit 101 uses the image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color. Character size information indicating the size of the character represented by the character color area is acquired.

The color information acquisition unit 102 acquires character color information representing the character color and background color information representing the background color based on the image information.

The readability determination information output unit 103 reads the image based on the character size information acquired by the character size information acquisition unit 101 and the character color information and background color information acquired by the color information acquisition unit 102. Obtains a readability parameter having a value that increases as the likelihood of reading the character increases. Furthermore, the readability determination information output unit 103 outputs readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value.

According to this, the information processing apparatus 100 outputs the readability determination information based on the character size in addition to the character color and the background color. That is, the information processing apparatus 100 estimates whether or not a viewer of an image can read characters in the image based on the character color, background color, and character size. As a result, according to the information processing apparatus 100, it is possible to estimate with high accuracy whether or not the viewer of the image can read the characters in the image.

In this case, it is preferable that the readability determination information output unit is configured to use a value that decreases as the character size represented by the acquired character size information increases as the reference value.

According to this, the information processing apparatus determines that the smaller the readability parameter, the smaller the character size, the smaller the reference value. That is, according to the information processing apparatus, it is possible to estimate with high accuracy whether or not a viewer of an image can read characters in the image.

In this case, the character size information acquisition means is a region including a character color region representing the character, and a rectangular shape arranged so that each side is in contact with the boundary between the character color region and the background color region. It is preferable that the character size information indicating the size of the character is acquired based on the size of the region.

In this case, the character size information acquisition means performs a plurality of characters on a character-containing region including a plurality of character color regions representing a plurality of characters arranged in a straight line along a predetermined alignment direction. Representative character size information representing a representative value representing the size of the character size information is acquired as the character size information,
The readability determination information output means is preferably configured to output the readability determination information for the character-containing region.

Incidentally, when a plurality of characters are arranged side by side, the sizes of the plurality of characters may be different from each other (for example, the plurality of characters may be “ka” or “Ao”). Even in such a case, according to the above configuration, the size of a plurality of characters can be handled as the same size (the same font size).

In this case, the character-containing region has a distance in the alignment direction between an arbitrary character color region included in the character-containing region and any other character color region included in the character-containing region. It is preferable to set the distance to be equal to or less than a predetermined threshold distance.

In this case, it is preferable that the character size information obtaining unit is configured to use the size of the character having the maximum size among the plurality of characters as the representative value.

In this case, the character size information acquisition means is an area including all of the character color areas representing the plurality of characters, and is arranged so that each side is in contact with the boundary between the character color area and the background color area It is preferable that information representing the length of the rectangular region formed in a direction orthogonal to the alignment direction is acquired as the representative character size information.

In another aspect of the information processing apparatus,
It is preferable that the character size information acquisition unit is configured to use, as the representative value, a character size having a minimum size among the plurality of characters.

In this case, the character size information acquisition unit acquires, as the representative character size information, information representing the length of the character having the minimum length in the direction orthogonal to the alignment direction among the plurality of characters. It is preferable to be configured as described above.

In this case, the color information acquisition means acquires information representing a value obtained by averaging values representing colors in the character color area as the character color information, and averages values representing colors in the background color area. It is preferable that information representing a value is acquired as the background color information.

In this case, the information processing apparatus
Performing binarization processing for converting a value representing a color included in the image into one of a first value and a second value, and converting the region colored by the color represented by the first value into the character color region It is preferable that the region colored in the color represented by the second value is used as the background color region.

In this case, it is preferable that the readability determination information output means is configured to output by displaying the readability determination information.

In this case, it is preferable that the readability determination information output unit is configured to display the readability determination information together with the image in association with the character color region that is the basis of the readability determination information. .

According to this, the user of the information processing apparatus can easily recognize, for each character in the image, whether or not it is highly likely that the viewer of the image can read the character. That is, the convenience of the user of the information processing apparatus can be improved.

In this case, the readability determination information output unit acquires the readability parameter for each of a plurality of combinations of character color information representing an arbitrary character color and background color information representing an arbitrary background color. It is preferable that the readability determination information indicating whether or not the acquired readability parameter is larger than the reference value determined according to the acquired character size information is output.

According to this, it is determined whether or not the user of the information processing apparatus has a sufficiently high possibility that the viewer of the image can read the character by using any combination as the combination of the character color and the background color. It can be easily recognized. That is, the convenience of the user of the information processing apparatus can be improved.

In this case, the readability determination information output unit is configured to calculate a contrast ratio based on the relative luminance of the character color and the relative luminance of the background color, and acquire the calculated contrast ratio as the readability parameter. It is preferred that

In this case, the information processing method is
It is preferable that the reference value is configured to use a value that decreases as the size of the character represented by the acquired character size information increases.

In this case, the information processing method is
Based on the size of a rectangular region that is a region including a character color region representing the character and is arranged so that each side is in contact with the boundary between the character color region and the background color region. It is preferable to be configured to acquire character size information indicating the size.

In this case, the information processing method is
For character-containing areas including a plurality of character color areas representing a plurality of characters arranged in a straight line, representative character size information representing a representative value representing the size of the plurality of characters is displayed as the character size. As information,
It is preferable that the readability determination information for the character-containing region is output.

In this case, the character size information acquisition means is a representative representing the size of the plurality of characters with respect to a character-containing region including a plurality of character color regions representing a plurality of characters arranged in a straight line. Configured to obtain representative character size information representing a value as the character size information,
The readability determination information output means is preferably configured to output the readability determination information for the character-containing region.

Even the invention of the information processing method or program having the above-described configuration can achieve the above-described object of the present invention because it has the same operation as the information processing apparatus.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

In addition, in each said embodiment, each function of the information processing apparatus 1 was implement | achieved when CPU performed a program (software), However, You may implement | achieve by hardware, such as a circuit.

In each of the above embodiments, the program is stored in the storage device, but may be stored in a computer-readable recording medium. For example, the recording medium is a portable medium such as a flexible disk, an optical disk, a magneto-optical disk, and a semiconductor memory.

Further, as another modified example of the above-described embodiment, any combination of the above-described embodiments and modified examples may be employed.

The present invention enjoys the benefit of the priority claim based on the patent application of Japanese Patent Application No. 2009-132858 filed on June 2, 2009 in Japan, and was disclosed in that patent application. The entire contents are intended to be included herein.

The present invention is applicable to an information processing apparatus that estimates whether or not a viewer of an image can read characters in the image.

DESCRIPTION OF SYMBOLS 1 Information processing apparatus 11 Character background recognition part 12 Contrast determination part 13 Determination result output part 100 Information processing apparatus 101 Character size information acquisition part 102 Color information acquisition part 103 Readability determination information output part

Claims

Based on image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color, the size of the character represented by the character color region in the image Character size information acquisition means for acquiring character size information representing
Color information acquisition means for acquiring character color information representing the character color and background color information representing the background color based on the image information;
Based on the acquired character size information and the acquired character color information and background color information, the readability has a value that increases as the possibility that the viewer of the image can read the character increases. Readability determination information output means for acquiring a parameter and outputting readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value;
An information processing apparatus comprising:
The information processing apparatus according to claim 1,
The readability determination information output unit is an information processing apparatus configured to use, as the reference value, a value that decreases as the size of the character represented by the acquired character size information increases.
The information processing apparatus according to claim 1 or 2,
The character size information acquisition means is a region including a character color region representing the character and a size of a rectangular region arranged so that each side is in contact with a boundary between the character color region and the background color region. An information processing apparatus configured to acquire character size information representing the size of the character based on the size.
An information processing apparatus according to any one of claims 1 to 3,
The character size information acquisition unit is configured to determine the size of the plurality of characters with respect to a character-containing region including a plurality of character color regions representing a plurality of characters arranged in a straight line along a predetermined alignment direction. Representative character size information representing a representative value representing the character size information is acquired as the character size information,
The information processing apparatus configured to output the readability determination information for the character-containing region.
The information processing apparatus according to claim 4,
The distance in the alignment direction between any character color region included in the character-containing region and any other character color region included in the character-containing region is a predetermined threshold value. An information processing apparatus set to be less than or equal to the distance.
The information processing apparatus according to claim 4 or 5,
The information processing apparatus configured to use the character size having the maximum size among the plurality of characters as the representative value.
The information processing apparatus according to claim 6,
The character size information acquisition means is an area that includes all of the character color areas representing the plurality of characters and is arranged so that each side is in contact with the boundary between the character color area and the background color area An information processing apparatus configured to acquire, as the representative character size information, information representing the length of the region in a direction orthogonal to the alignment direction.
The information processing apparatus according to claim 4 or 5,
The information processing apparatus configured to use, as the representative value, a character size having a minimum size among the plurality of characters.
The information processing apparatus according to claim 8,
The character size information acquisition unit is configured to acquire, as the representative character size information, information representing the length of a character having a minimum length in a direction orthogonal to the alignment direction among the plurality of characters. Information processing apparatus.
An information processing apparatus according to any one of claims 1 to 9,
The color information acquisition means acquires information representing a value obtained by averaging values representing colors in the character color area as the character color information, and represents a value obtained by averaging values representing colors in the background color area. An information processing apparatus configured to acquire information as the background color information.
An information processing apparatus according to any one of claims 1 to 10,
Performing binarization processing for converting a value representing a color included in the image into one of a first value and a second value, and converting an area colored by the color represented by the first value into the character color area And an information processing apparatus configured to use, as the background color area, an area colored in the color represented by the second value.
An information processing apparatus according to any one of claims 1 to 11,
The readability determination information output unit is an information processing apparatus configured to display and output the readability determination information.
An information processing apparatus according to claim 12,
The readability determination information output unit is an information processing apparatus configured to display the readability determination information together with the image in association with the character color region that is the basis of the readability determination information.
An information processing apparatus according to any one of claims 1 to 13,
The readability determination information output means acquires the readability parameter for each of a plurality of combinations of character color information representing an arbitrary character color and background color information representing an arbitrary background color, and the acquisition An information processing apparatus configured to output readability determination information indicating whether the readability parameter is larger than the reference value determined in accordance with the acquired character size information.
An information processing apparatus according to any one of claims 1 to 14,
The readability determination information output unit is configured to calculate a contrast ratio based on the relative luminance of the character color and the relative luminance of the background color, and to acquire the calculated contrast ratio as the readability parameter Processing equipment.
Based on image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color, the size of the character represented by the character color region in the image Get character size information that represents
Based on the image information, obtain character color information representing the character color and background color information representing the background color,
Based on the acquired character size information and the acquired character color information and background color information, the readability has a value that increases as the possibility that the viewer of the image can read the character increases. An information processing method for acquiring a parameter and outputting readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value.
An information processing method according to claim 16, comprising:
An information processing method, wherein a value that decreases as a character size represented by the acquired character size information increases is used as the reference value.
An information processing method according to claim 16 or claim 17,
Based on the size of a rectangular area that is a region that includes a character color region that represents the character and that is arranged so that each side is in contact with the boundary between the character color region and the background color region. An information processing method for acquiring character size information representing a size.
The information processing method according to any one of claims 16 to 18, comprising:
For character-containing regions including a plurality of character color regions representing a plurality of characters arranged in a straight line, representative character size information representing a representative value representing the size of the plurality of characters is displayed as the character size. As information,
An information processing method for outputting the readability determination information for the character-containing region.
In the information processing device,
Based on image information representing an image including a character color region colored in a character color and a background color region colored in a background color other than the character color, the size of the character represented by the character color region in the image Character size information acquisition means for acquiring character size information representing
Color information acquisition means for acquiring character color information representing the character color and background color information representing the background color based on the image information;
Based on the acquired character size information and the acquired character color information and background color information, the readability has a value that increases as the possibility that the viewer of the image can read the character increases. Readability determination information output means for acquiring a parameter and outputting readability determination information indicating whether or not the acquired readability parameter is larger than a preset reference value;
A program to realize
The program according to claim 20, wherein
The readability determination information output unit is a program configured to use, as the reference value, a value that decreases as the size of the character represented by the acquired character size information increases.
A program according to claim 20 or claim 21, wherein
The character size information acquisition means is a region including a character color region representing the character and a size of a rectangular region arranged so that each side is in contact with a boundary between the character color region and the background color region. A program configured to acquire character size information indicating the size of the character based on the size.
A program according to any one of claims 20 to 22,
The character size information acquisition means represents a representative value representative of the size of the plurality of characters for a character-containing region including a plurality of character color regions representing a plurality of characters arranged in a straight line. It is configured to obtain representative character size information as the character size information,
The readability determination information output means is a program configured to output the readability determination information for the character-containing region.