JP5061778B2 - Subtitle correction display method - Google Patents

Description

  The present invention relates to a caption correction display method, and more particularly to a correction display method of image data included in caption data of one segment broadcast in terrestrial digital broadcasting.

  In Japan, terrestrial digital broadcasting having 13 segment structures has already been started. In this terrestrial digital broadcasting, it is possible to individually receive only one central segment out of 13 segments, and broadcasting services are provided for mobile terminals or mobile devices as one-segment broadcasting, so-called one-segment broadcasting. Has been started.

  For the caption data in this one-segment broadcasting, as shown in the caption display example shown in FIG. 9 (a), DRCS (Dynamically Redefinable Character) of a system in which external characters used based on the standards for character broadcasting and data broadcasting character encoding are sent in a pattern. There is character image data whose character size is fixed (Sets: dynamically redefinable character set). FIG. 9B shows a figure 1 of a “sixteenth note” in a display example (16 pixels × 18 pixels) of character image data of this DRCS.

  Thus, the DRCS is character image data in which the character size is fixed in the subtitle data. For example, the display of the character 2 of “fun music” of the other subtitles shown in FIG. The character size of the portion has been changed to a character size that is easy to see on a display such as a liquid crystal monitor to be displayed.

  Therefore, as shown in FIG. 9A, when the character size of DRCS and the character size of other subtitles are greatly different, the display content is very difficult to see on a display with a limited display area. In particular, in recent years, many small broadcast receiving apparatuses such as mobile phones with TVs have been proposed, and the screen of such a small broadcast receiving apparatus is so small that character recognition becomes more difficult.

  As a result, the subtitles displayed on the display seem to be wrong, leading to user complaints. In order to solve such a problem that the conventional technique has, some technical solution means for adjusting the character size of DRCS to the character size of other subtitles is required.

  As conventional technical means for changing the character size, a display device for high-definition images and progressive scanning displays character data of a small display size, and a display device for standard images and interlaced scanning. It is possible to display character data of a size that is displayed in a large size, and to display character data of an optimal size selected according to the characteristics of the display device, making it difficult for the user to see the character data There has been proposed a character display processing device configured so as not to be felt or to hide the main screen more than necessary due to character data (see, for example, Patent Document 1).

  Further, as a conventional technical means for changing another character size, an image signal of a character part is extracted from an input image signal, and the image size is enlarged or reduced, and the processed image signal is processed. An image signal processing apparatus configured to display a portion of characters such as subtitles and telops enlarged or reduced by combining an input image signal with an input image signal has been proposed (for example, Patent Document 2).

  Further, as a conventional technical means for changing the character size, in an information receiving / reproducing apparatus such as a broadcast receiver that receives and reproduces subtitle data, the viewing environment (brightness or noise of a room to be viewed) or viewing Technology that automatically adjusts subtitle data so that it is easy to see and display according to the viewer's viewing behavior (viewer attitude, position, movement, etc. while viewing) and metadata indicating program information Means are disclosed (for example, see Patent Document 3).

  Further, as a conventional technical means for changing the character size, in a mobile phone capable of displaying a character image in a TV image on a liquid crystal display screen, it is within a specified image range in the TV image. The image data is extracted and output to the pixel number increasing / decreasing unit. The pixel number increasing / decreasing unit increases or decreases the pixel data of the image based on the pixel number increasing / decreasing proportional value designated by the operation unit. ), And technical means configured to be able to arbitrarily select the display position and size (display range) of the character image to be displayed on the liquid crystal display unit (for example, see Patent Document 4).

JP 2001-69418 A JP 2005-252365 A JP 2006-5418 A JP 2002-159051 A

  However, any of the conventional technical means disclosed in the technical documents 1 to 3 described above discloses a technical means for changing the character size. However, all of the disclosed technical means uniformly change the size of all characters to be displayed, and technical means for matching some character sizes with other character sizes are not disclosed at all. Absent. Therefore, the problem that “the display is very difficult to see” due to the difference between the character size of DRCS and the character size of other subtitles cannot be solved.

  Further, in the above-described technical document 4, a technique for changing a part of the character size is disclosed, but a character whose character size is to be changed must be selected each time, and thus is not suitable for subtitle display.

  The present invention is intended to solve such problems of the conventional configuration, and without performing complicated caption correction processing, a caption display including DRCS can be read on a display without a sense of incongruity. It is an object of the present invention to provide a caption correction display method that can be used.

  In order to achieve the above object, the caption correction display method of the present invention is a correction display method for character image data in which the character size included in the caption data of one-segment broadcasting in digital terrestrial broadcasting is fixed. Set the subtitle character size in advance to a character size that is a multiple of the character size of the character image data or a subtitle character size close to it so that there is no sense of incongruity with other subtitle character sizes when the image data is enlarged. Subtitle character size setting step, and a plurality of pixels centered on the pixel to be investigated in the character image data are confirmed, the shape of the image when the character image data is displayed is recognized, and contour correction is required. A contour correction location extracting step for extracting a location to be performed, a character image data enlargement processing step for performing an enlargement process on the character image data, When the character image data enlargement processing by the serial character image data enlargement processing step is characterized by having a contour correction processing step of performing contour correction processing on the portion that requires correction extracted in the contour correction part extraction step.

  The present invention also provides the following aspects of the subtitle correction display method.

  That is, in the contour correction location extraction step, the character image data is divided into predetermined rows, the pixel data in the region of the predetermined pixel centered on the pixel to be examined is checked, and the contour correction processing needs to be performed. It is characterized by recognizing.

  The contour correction location extracting step is characterized in that a plurality of patterns of the shape of the location requiring correction are determined in advance, and a location matching the shape is recognized and extracted as a location requiring contour correction. Yes.

  The subtitle correction display method of the present invention enlarges the character image data when displaying DRCS character image data, and eliminates the sense of incongruity with other subtitle character sizes when the character image data is enlarged. Thus, by setting the subtitle character size to a character size that is a multiple of the character size of the character image data or a subtitle character size close thereto, the display image can be read without complicated subtitle correction processing. And the viewer's dissatisfaction that the character display in the DRCS part of the subtitle display including DRCS is small and difficult to see can be solved.

  Further, the subtitle correction display method of the present invention confirms each of a plurality of pixels centering on the pixel to be investigated in the character image data, recognizes the shape of the image when the character image data is displayed, and performs contour correction. In addition to extracting the required part and performing the contour correction process on the part that needs to be corrected at the time of the character image data enlargement process, it becomes possible to perform processing such as improving the legibility of the display image and based on the character image data The jagged edges of the display image can be suppressed, and a character size suitable for the display size and easy to read for the viewer can be automatically displayed on the display.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIGS. 1A to 1C are explanatory diagrams showing an example of analysis of DRCS character image data of one-segment broadcasting in terrestrial digital broadcasting, and FIGS. 2A to 2L are diagrams of character image data of DRCS. FIG. 3A to FIG. 3C are explanatory views showing a first correction example in the case of double-angle display of DRCS and triple-angle display of DRCS, and FIG. 4 (a) to 4 (c) are explanatory diagrams illustrating a second correction example in the case of DRCS double angle display and DRCS triple angle display.

  5A to 5C are explanatory diagrams showing examples of double-angle correction display of DRCS, FIG. 6 is an explanatory diagram showing an example of subtitle display including DRCS subjected to double-angle correction, and FIG. (A) and (b) of FIG. 8 are explanatory diagrams showing examples of correction target shapes and correction points after double- and triple-folded DRCS, and (a) to (c) of FIG. It is explanatory drawing which shows the example of a correction display after double angle.

First, a first embodiment of the present invention will be described.
When the subtitle correction display method of the present invention is executed, the subtitle character size is set to the character size of the character image data so that there is no sense of incongruity with other subtitle character sizes when the DRCS character image data described later is enlarged. It is set in advance to a multiple character size or a closed caption character size.

  For example, when the subtitle character size is preset to a double angle of the character size of the character image data and the DRCS character image data is displayed, the DRCS pixel is doubled. As a result, the character size and subtitle character size of the enlarged DRCS character image data can be read without a sense of incongruity.

  As described above, the subtitle correction display method of the present invention enlarges the DRCS character image data and sets the other subtitle character size to a character size that is a multiple of the character size of the character image data or a subtitle character size close thereto. This is characterized in that when the character image data is enlarged and processed, the feeling of discomfort with other subtitle character sizes is eliminated.

  As a contour correction method for eliminating a sense of incongruity with other subtitle character sizes, the DRCS character image data is confirmed for each of a plurality of pixels centering on the investigation object, and the shape of the DRCS is simplified. recognize. At this time, a plurality of patterns are determined in advance for a shape that requires contour correction, and a correction method for a portion that matches the shape is also determined in advance.

  For example, the character image data for displaying the “sixteenth note” 1 shown in FIG. 1A is shown in the investigation target line and the upper and lower lines of the investigation target line as shown in FIG. After dividing the block into a total of 3 rows of blocks, as shown in FIG. 1 (c), the pixel data in the region of 3 vertical pixels × 3 horizontal pixels centering on the pixel to be examined is checked, A part that needs to be corrected is recognized, that is, a part where a blacked-out part is indented, and a part that needs contour correction is extracted. Thus, in order to confirm 3 vertical pixels × 3 horizontal pixels centering on the pixel to be examined, it is considered that there is a margin for each pixel around the original data of DRCS.

  On the other hand, for example, as shown in FIGS. 2 (a) to (l), a plurality of patterns are determined in advance as the shape to be corrected, and a location that matches the extraction result of the location requiring the contour correction. Is subjected to contour correction processing, that is, black-out processing when double-width display of DRCS character image data.

  FIG. 3A to FIG. 3C and FIG. 4A to FIG. 4C show examples of contour correction at the time of double angle and triple angle display. Further, FIGS. 5A to 5C show display examples in which double angle correction is actually performed.

  In this way, by executing the caption correction display method of the present invention, as shown in FIG. 6, caption display including DRCS character image data can also be read correctly and read without discomfort. And no complaints from viewers.

  Next, based on (a) and (b) of FIG. 7 and (a) to (c) of FIG. 8, after confirming the character shape of the doubled character image data, another method of contour correction is performed. Embodiments will be described.

  In a state in which the character image data described in the first embodiment is not doubled, a range in which one pixel is added to the top, bottom, left, and right around one pixel of the investigation target pixel (vertical 3 pixels × horizontal 3 pixels) The shape of character image data was being investigated.

  However, in this embodiment, the shape investigation in the state where the character image data is doubled is performed by multiplying the pixel as a result of doubled angle, for example, 2 × vertical 2 × horizontal 2x, and 3 × For example, a range in which 3 pixels in the vertical direction and 3 pixels in the horizontal direction are set as the pixel to be investigated, and one pixel is added to the top, bottom, left, and right around the pixel to be examined, for example, as shown in FIG. For example, a survey is performed with 4 vertical pixels × 4 horizontal pixels. Further, as shown in FIG. 7B, if the size is triple, a survey is performed with 5 vertical pixels × 5 horizontal pixels to extract a correction portion. (A) to (c) of FIG. 8 show examples of correction display after doubling.

  As another embodiment of the present invention, when displaying a program guide or the like, if a television video screen is displayed in a picture-in-picture display, and subtitles are displayed in accordance with the television video screen, as described above. It is also possible to perform the enlarged display of the DRCS if the subtitle character size is adjusted to the DRCS without displaying the enlarged DRCS, and if the subtitle is displayed without adjusting to the TV image screen. is there.

  Further, not only in DRCS, but in character image data with a fixed character size and when the interval between lines is one pixel, caption correction is performed in the same manner as the caption correction display method according to the present invention described above. be able to. In addition to DRCS, when a character is a normal character and the interval between the lines is one pixel, double-angle display can be performed by the same method as the caption correction display method according to the present invention described above.

  Furthermore, not only subtitles, but also when character image data with a fixed character size and normal characters are mixed, it is possible to adopt the same method as the above-described subtitle correction display method according to the present invention, The present invention is not limited to the first embodiment described above.

It is a drawing substitute photograph which shows the example of analysis of the character image data of DRCS of the 1 seg broadcasting in the terrestrial digital broadcasting which concerns on this invention. It is a drawing substitute photograph which shows the example of a shape used as the correction object of the character image data of DRCS. FIG. 10 is a drawing-substituting photograph showing a first correction example in the case of double-size display of DRCS and triple-size display of DRCS. FIG. 10 is a drawing-substituting photograph showing a second correction example in the case of double-size display of DRCS and triple-size display of DRCS. It is a drawing-substituting photograph showing an example of double-angle corrected display of DRCS. It is a drawing substitute photograph which shows the example of a subtitle display containing DRCS which performed double angle correction. It is a drawing-substituting photograph showing an example of the shape to be corrected and the corrected portion after the double and triple magnification of DRCS. It is a drawing substitute photograph which shows the example of a correction | amendment display after double-sizing DRCS. It is a drawing-substituting photograph showing an example of subtitle display including DRCS of one-segment broadcasting in conventional terrestrial digital broadcasting.

Explanation of symbols

1 "Sixteenth note" figure 2 "Fun music" characters

Claims (3)

A method for correcting and displaying character image data in which character size included in subtitle data of one-segment broadcasting in terrestrial digital broadcasting is fixed,
The subtitle character size is set in advance to a character size that is a multiple of the character size of the character image data, or a subtitle character size close to it so that there is no sense of incongruity with other subtitle character sizes when the character image data is enlarged. Subtitle character size setting step
A contour correction portion that checks a plurality of pixels centering on the pixel to be investigated in the character image data, recognizes the shape of the image when the character image data is displayed, and extracts a portion that requires contour correction. An extraction step;
A character image data enlargement process step for enlarging the character image data;
A contour correction processing step for performing a contour correction process on a portion that requires correction extracted in the contour correction portion extraction step during the character image data expansion processing in the character image data expansion processing step;
A subtitle correction display method characterized by comprising:   The contour correction location extraction step divides the character image data into predetermined rows, confirms pixel data in a predetermined pixel area centering on the pixel to be examined, and recognizes a location where contour correction processing is necessary. The subtitle correction display method according to claim 1, wherein:   The contour correction location extracting step determines a plurality of patterns of the shape of a location requiring correction in advance, recognizes a location that matches the shape as a location requiring contour correction, and extracts the location. Item 3. The caption correction display method according to Item 1 or Item 2.