JP2011180486A - Restoration method for restoring original image from photographic recording medium - Google Patents

Abstract

There is a risk that even a non-deteriorated portion of a photographic recording medium may be removed.
A transmitted light imaging step (step S50) for generating first image data, a scattered light imaging step (step S51) for generating second image data, and the same pattern by inverting the patterns. A pattern inversion step (step S52), a gradation value range changing step (step S53) for changing the range of the gradation values of the first image data and the second image data,
There is provided a restoration method for restoring an original image from a photographic recording medium including a gradation value addition step (step S54) for generating third image data by adding gradation values at the same pixel position.
[Selection] Figure 2

Description

  The present invention relates to a restoration method for restoring an original image from a photographic recording medium.

In photographic recording media such as photographic plates and photographic films stored for a long time, silver diffuses on the surface side of the emulsion coated on the photographic recording media due to aging. Therefore, if you try to restore the original image at the time of shooting from such a photographic recording medium by creating a silver halide photograph or reading an image using a scanner, unnecessary lines or patterns may be formed or contours may be formed. The original image at the time of shooting cannot be restored due to blurring.

Therefore, for example, Patent Document 1 proposes a method of scraping or removing a silver-degraded surface of a photographic dry plate or photographic film that has been stored for a long time using a solution.

Japanese Patent No. 3446174

However, in the method of Patent Document 1, if the degree of pressure when scraping the surface is too large, the solution does not have a specified concentration, or is not performed according to a specified procedure, There is a risk of removing even a portion that has not deteriorated. In such a case, there is a problem that the original image cannot be restored.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

Application Example 1 A photographic recording medium having an emulsion coated on a transparent support member is irradiated by a first light source in a direction perpendicular to the plane of the transparent support member, and the transmitted light transmitted through the photographic recording medium is imaged. A transmitted light imaging step of capturing an image by a unit and generating first image data, and irradiating in a direction oblique to the plane of the transparent support member by a second light source, and the second of the photographic recording medium The scattered light imaging step of blocking light from the opposite side of the light source, capturing scattered light from the photographic recording medium by the imaging unit, and generating second image data, and using the image processing unit, the first A pattern inversion step for inverting one pattern of the first image data and the second image data to make the first image data and the second image data the same pattern, and the pattern inversion In the process A gradation value range changing step for changing a range of gradation values of the first image data and the second image data having the same pattern using the image processing unit; and the gradation value range changing A third image is obtained by adding tone values at the same pixel position using the image processing unit in the first image data and the second image data in which the range of tone values is changed by a process. A restoring method for restoring an original image from a photographic recording medium, comprising: a gradation value adding step for generating data.

According to this configuration, the second light source irradiates in a direction oblique to the plane of the transparent support member, blocks light from the opposite side of the photographic recording medium from the second light source, and scatters from the photographic recording medium. It includes a scattered light imaging step in which light is imaged by the imaging unit and second image data is generated. As a result, scattered light is generated at the silver deposition portion formed at the time of photographing in the deep portion on the transparent support member side in the emulsion. Therefore, by imaging the scattered light by the imaging unit, it is possible to acquire the silver precipitation state formed at the time of photographing in the deep part on the transparent support member side in the emulsion as the second image data.
Further, the first image data and the second image data in which the gradation value range is changed by the gradation value range changing step.
In this image data, a gradation value adding step of generating third image data by adding gradation values at the same pixel position using the image processing unit is included. As a result, the third image data includes second image data in which the deposition state of silver formed at the time of photographing is imaged in a deep portion on the transparent support member side in the emulsion. For this reason, if the third image data is used for printing on an image printing apparatus or displaying on an image display apparatus, unnecessary lines and patterns are prevented from being formed and the outline is blurred. It is possible to obtain an original image close to the image quality.

Application Example 2 In the scattered light imaging step, the angle of the irradiation light with respect to the plane of the transparent support member is changed by changing the attitude of the second light source, and the original image from the photographic recording medium Restore the above restore method.

According to this configuration, the angle of the irradiation light with respect to the plane of the transparent support member changes. This
An image with high contrast in the image captured by the imaging unit can be acquired.

Application Example 3 In the scattered light imaging step, irradiation is performed by a pair of the second light sources in which the angle of the irradiation light with respect to the plane of the transparent support member is the same and the direction of the irradiation light is opposite. The above restoration method for restoring an original image from a characteristic photographic recording medium.

According to this configuration, the amount of light incident on the photographic recording medium can be increased. Further, the incident light quantity can be further averaged. This makes it possible to obtain an image with high contrast. In addition, shadows due to irradiation from one of the light sources are hardly formed.

Application Example 4 The above restoration method for restoring an original image from a photographic recording medium, wherein the photographic recording medium is a photographic plate.
Thereby, the original image close | similar to the image quality of the original image at the time image | photographed using the photographic plate can be restored.

The figure which showed the main components which comprise the image restoration apparatus in 1st Embodiment. The flowchart of the process of decompress | restoring an original image from a photographic plate. The schematic diagram for demonstrating the transmitted light imaging process. (A) is a schematic diagram of a partial cross section of a photographic recording medium in a transmitted light imaging process, (b) is a graph for explaining gradation values at pixel positions corresponding to the position of the partial cross section, (c). Is a graph of gradation values obtained by inverting the pattern. The schematic diagram for demonstrating a scattered light imaging process. (A) is a schematic diagram of a partial cross section of a photographic recording medium in the scattered light imaging step, and (b) is a graph for explaining gradation values in the partial cross section. (A), (b) is the graph which changed the range of the gradation value, (c) is the graph drawn by adding a gradation value. The figure which showed the main components which comprise the image restoration apparatus in 2nd Embodiment. The figure which showed the main components which comprise the image restoration apparatus in 3rd Embodiment.

(First embodiment)
The first embodiment will be described below with reference to the drawings. FIG. 1 is a diagram showing main components constituting the image restoration apparatus 1 according to the first embodiment. The image restoration apparatus 1 includes a support base 13 such as transparent glass or plastic, and the support base 13 includes a transparent glass plate 22 that is a transparent support member and an emulsion 21 applied to the glass plate 22. A photographic plate 20 as a photographic recording medium is placed.

A first light source 11 is provided on the opposite side of the support base 13 from the photographic dry plate 20. First light source 11
Irradiates the irradiation light L <b> 1 from a direction perpendicular to the plane 23 of the glass plate 22.

The light shielding portion 12 made of a black material can move in the direction of the arrow D1. Shading part 12
However, when it exists in the position shown in FIG. 1 which covers the surface on the opposite side to the photographic plate 20 of the support stand 13, the irradiation light L1 from the 1st light source 11 is interrupted | blocked. When the light shielding portion 12 is at the position indicated by the two-dot chain line B,
Irradiation light L <b> 1 from the first light source 11 becomes transmitted light passing through the support base 13 and irradiates the photographic plate 20.

The second light source 10 is provided on the photographic dry plate 20 side of the support base 13. The second light source 10 irradiates the plane 23 of the glass plate 22 of the photographic dry plate 20 with the irradiation light L2 from an oblique direction.
The second light source 10 can change its posture in the rotation direction D2. Thereby, the glass plate 2
The angle A of the irradiation light L2 with respect to the two planes 23 changes.

On the opposite side of the support base 13 from the first light source 11, a digital camera 2 as an imaging unit is provided. The digital camera 2 is provided with an image sensor such as a CCD and a photographic plate 20.
An image on the emulsion 21 side is taken to generate image data.

The image restoration device 1 includes a control device 4, an image display device 7 including a liquid crystal panel, and a keyboard 5 and a mouse 6 serving as input devices for a user to operate. The control device 4 includes a control unit including a CPU (not shown), a RAM (not shown), a ROM (not shown), and an HDD (not shown).

Image data generated in the digital camera 2 by the operation of the keyboard 5 and mouse 6 by the user is transferred to the HDD of the control device 4 via the communication cable 3.

In the HDD, for example, PHOTOSHOP (registered trademark) is stored as an operating system and image editing application software.

The image processing unit (not shown) in the present embodiment includes a control unit provided in the control device 4, an operating system, and image editing application software. The image processing unit functions when the CPU reads the operating system and image editing application software from the HDD into the RAM and executes them.

The image restoration device 1 is connected to the control device 4 via the communication cable 8, and the liquid ejection head (
An image printing apparatus 9 is provided as an image output unit that is an ink jet printer that ejects ink from a not-shown ink to form an image on a print recording medium P such as paper. The image printing apparatus 9 may be a laser printer that forms an image by irradiating a photoconductor (not shown) with a laser.

The original image restored by the image restoration device 1 is displayed on the image display device 7 as an image output unit. The original image restored by the image restoration device 1 is printed on the print recording medium P by the image printing device 9.

Next, a method for restoring the original image from the photographic plate 20 will be described. 2 shows a photographic plate 2
10 is a flowchart of a process of restoring an original image from zero. FIG. 3 is a schematic diagram for explaining the transmitted light imaging step.

In the transmitted light imaging process of step S50 of FIG. 2, the first light source 11 of FIG. 3 is turned on, and the irradiation light L1 is irradiated in a direction perpendicular to the plane 23 of the glass plate 22. Since the light shielding unit 12 is at the position shown in FIG. 3, the irradiation light L <b> 1 passes through the support base 13 and the photographic dry plate 20. At this time, the second light source 10 is turned off.

In the transmitted light imaging step, the digital camera 2 captures an image formed by the irradiation light L1 transmitted through the support base 13 and the photographic dry plate 20, and generates first image data.

FIG. 4A is a schematic diagram of a partial cross section of the photographic dry plate 20 in the transmitted light imaging process of step S50. A darkly shaded portion (range R1 indicated by an arrow) indicates a region 30 where silver is deposited by the development processing and fixing processing at the time of photographing. A thinly shaded portion (range R2 indicated by an arrow) indicates a region 31 where silver is diffused from a region 30 where silver is deposited due to aging.

A region 30 where silver is deposited at the time of photographing reaches the surface from the deep portion of the emulsion 21 on the glass plate 22 side. On the other hand, the region 31 in which silver diffuses due to secular change is not formed in the deep part but is formed only on the surface side.

The irradiation light L1 of FIG. 4A from the first light source 11 of FIG. Irradiation light L10 applied to the region 30 where silver is deposited at the time of photographing and the region 31 where silver is diffused due to aging does not pass through the emulsion 21. On the other hand, the irradiation light L11 that irradiates the area 30 where silver is deposited at the time of photographing and the area 31 where silver is diffused due to secular change is not formed.
Passes through the emulsion 21.

FIG. 4B is a graph for explaining gradation values in a partial cross section of FIG. 4A in the first image data imaged by the digital camera 2 in the transmitted light imaging process in step S50. . The vertical axis represents the gradation value, and the horizontal axis represents the pixel position corresponding to the position of the partial cross section of FIG. In the present embodiment, the range of gradation values is, for example, a value from 0 to 255.

In the ranges R1 and R2 in FIG. 4A, the irradiation light L10 does not pass through the emulsion 21,
The gradation value becomes 0. In a range other than the ranges R1 and R2, the gradation value is 255 because the irradiation light L11 passes through the emulsion 21. Accordingly, in the transmitted light imaging process of step S50, the first image data generated by the digital camera 2 is a negative pattern.

FIG. 5 is a schematic diagram for explaining the scattered light imaging process in step S51 of FIG. In the scattered light imaging step, the first light source 11 is turned off, and the light shielding portion 12 is at the position shown in FIG. Thereby, the light from the support stand 13 side can be blocked from the photographic plate 20.

In the scattered light imaging step, the second light source 10 is turned on, and the irradiation light L2 is irradiated from an oblique direction to the flat surface 23 of the glass plate 22 on the emulsion 21 side of the photographic dry plate 20. 2 in FIG. 1 and FIG.
The posture of the light source 10 can be changed in the rotation direction D2. When the attitude of the digital camera 2 is adjusted before operating the shutter (not shown), an image in the imaging field of view of the digital camera 2 is displayed on the image display device 7. In the image displayed on the image display device 7, the digital camera 2 is fixed in a posture where the contrast is high, and the user operates the shutter to capture the second image data.

FIG. 6A is a schematic diagram of a partial cross section of the photographic dry plate 20 in the scattered light imaging step of step S51. Region 30 where silver was deposited at the time of shooting, and region 3 where silver diffused due to secular change 3
When 1 is irradiated with the irradiation light L2, scattered light L12 is generated. As described above, since the region 30 where silver is deposited at the time of photographing is formed in the region from the deep part of the emulsion 21 to the surface, more scattered light L12 is generated than the region 31 where silver is diffused only on the plane.

Further, the silver concentration in the region 30 where silver is deposited at the time of photographing is higher than the silver concentration in the region 31 where silver diffuses due to secular change. Therefore, from the scattered light generated in the region 31,
More scattered light is generated in the region 30. Accordingly, the scattered light L13 in the range R1 toward the digital camera 2 in FIG. 1 is scattered light L1 in the range R2 toward the digital camera 2 side.
Stronger than 4.

FIG. 6B is a graph for explaining gradation values in a partial cross section of FIG. 6A in the second image data captured by the digital camera 2 in the scattered light imaging process in step S51. . Similar to FIG. 4B, the vertical axis indicates the gradation value, and the horizontal axis indicates the pixel position corresponding to the position of the partial cross section of FIG.

As shown in FIG. 6B, the gradation value is 0 in the range other than the ranges R <b> 1 and R <b> 2 because the light from the glass plate 22 side is blocked by the light shielding unit 12. In the range R2, the gradation value is a value from 0 to 255. In the region 30 where silver is deposited by exposure at the time of shooting, the gradation value is 2
55. Therefore, in the scattered light imaging process, the second image data generated by the digital camera 2 is a positive pattern.

FIG. 4C is a graph of gradation values obtained by inverting the pattern of the first image data from the negative pattern to the positive pattern. FIG. 4C is a graph obtained by inverting the gradation value graph of FIG. 4B in the vertical direction of the drawing. In the pattern reversal process in step S52 of FIG. 2, the user changes the tone value in the first image data generated in the transmitted light imaging process in step S50 by using the image editing application software, thereby changing the negative pattern. To a positive pattern (see FIGS. 4B and 4C).

In the gradation value range changing step in step S53 of FIG. 2, the user uses the image editing application software to display the first image data of the positive pattern shown in FIG.
The range of gradation values of the second image data of the positive pattern shown in (b) is changed.

FIG. 7A is a graph in which the gradation value range is changed from the gradation value graph of the first image data in FIG. In the gradation value range changing step, the first image data of the positive pattern in which the gradation value in FIG. 4C is in the range from 0 to 255, the gradation value in FIG. 7A is from 0 to K1. To the first image data of the positive pattern in the range of.

FIG. 7B is a graph obtained by changing the gradation value range from the gradation value graph of the second image data in FIG. In the gradation value range changing step, the second image data of the positive pattern in which the gradation value in FIG. 6B is in the range from 0 to 255 is converted into the gradation value in FIG. 7B from 0 to K2. To the second image data of the positive pattern in the range of.

FIG. 7C shows a gradation value graph of FIG. 7A and a gradation value graph of FIG.
It is the graph drawn by adding the gradation value in the same pixel position. Step S of FIG.
In the gradation value addition step 54, the user changes the gradation value range in the gradation value range changing step in step S53 and uses the same gradation value in the first image data and the second image data. The third image data of the positive pattern is generated by adding at the pixel position.

In the present embodiment, the sum of K1 and K2 is 255. Therefore, the range of gradation values of the third image data is 0 to 255. In this embodiment, the sum of K1 and K2 is set to 255, but the values of K1 and K2 can be adjusted according to the state of the photographic plate 20. Further, by adjusting the values of K1 and K2, it is possible to suppress contaminated unnecessary images.

In the image output process of step S55 in FIG. 2, the control device 4 in FIG. 1 prints the original image on the print recording medium P by using the third image data by the image printing device 9. Further, the control device 4 displays the original image on the image display device 7 using the third image data.

As described above, in the restoration method for restoring the original image from the photographic plate 20 as the photographic recording medium described in this embodiment, the photographic plate 20 as the photographic recording medium in which the emulsion 21 is coated on the glass plate 22 as the transparent support member. Is irradiated in a direction perpendicular to the plane 23 of the glass plate 22 by the first light source 11, and the transmitted light transmitted through the photographic dry plate 20 is imaged by the digital camera 2 which is an imaging unit, and the first pattern which is a negative pattern is obtained. Transmitted light imaging process for generating image data (step S
50), the second light source 10 irradiates the plane 23 of the glass plate 22 in an oblique direction, blocks light from the opposite side of the photographic dry plate 20 from the second light source 10, and The scattered image is captured by the digital camera 2 to generate the second image data that is a positive pattern (step S51), and an image processing unit including image editing application software is used to generate the first image. The first image data and the second image data are converted into the same positive pattern by inverting the pattern of the first image data, which is one of the data and the second image data, from a negative pattern to a positive pattern. Pattern inversion process (step S5
2) and a gradation value range changing step (step S53) for changing the range of gradation values of the first image data and the second image data having the same positive pattern by the pattern inversion step using the image processing unit. ) And the first image data and the second image data in which the gradation value range is changed by the gradation value range changing step, the gradation values are added at the same pixel position using the image processing unit. The gradation value adding step for generating the third image data which is a positive pattern by the step (Step S54)
And including.

According to this configuration, scattered light is generated in the silver precipitation portion formed at the time of photographing in the deep portion of the emulsion 21 on the glass plate 22 side. Therefore, by imaging the scattered light with the digital camera 2, the silver deposition state formed at the time of photographing in the deep part of the emulsion 21 on the glass plate 22 side can be acquired as the second image data.

Further, the third image data includes second image data in which the deposition state of silver formed at the time of photographing is imaged in a deep portion on the glass plate 22 side in the emulsion 21. Therefore, if the third image data is used to print on the image printing device 9 or display on the image display device 7,
Unnecessary lines and patterns are formed and outlines are prevented from being blurred, and an original image close to the image quality at the time of shooting can be obtained.

Further, according to the restoration method for restoring the original image from the photographic plate 20 in this embodiment, the emulsion 21 of the photographic plate 20 is not directly touched. Therefore, damage to the emulsion 21 of the photographic plate 20 can be suppressed.

In the scattered light imaging step, the angle A of the irradiation light L2 with respect to the flat surface 23 of the glass plate 22 is changed by changing the posture of the second light source 10 in the rotation direction D2.

Thereby, in the image captured by the digital camera 2, it is possible to obtain an image having high contrast between the region 30 where the silver is deposited by exposure at the time of photographing and the region other than the region 30.

(Second Embodiment)
In the second embodiment, a restoration device that restores an original image from the photographic plate 20 provided with a pair of second light sources will be described. FIG. 8 is a diagram showing main components constituting the image restoration apparatus 1a in the second embodiment.

The image restoration device 1a further includes a second light source 14 on the photographic dry plate 20 side of the support 13 of the image restoration device 1 in FIG. Similar to the first embodiment, the posture of the second light source 14 is set to the rotation direction D6.
Can be changed to The configuration other than the second light source 14 is the same as the configuration of the image restoration apparatus 1 described in the first embodiment.

In the second light source 14, the angle A of the irradiation light L3 with respect to the flat surface 23 of the glass plate 22 is the same as the angle A of the irradiation light L2 with respect to the flat surface 23 of the glass plate 22 by the second light source 10. Second
The second light source 10 and the second light source 14 are provided at a position where the direction of the irradiation light L3 from the light source 14 is opposite to the direction of the irradiation light L2 from the second light source 10.

In the scattered light imaging process in the second embodiment, a pair of second light sources 10 and 1 in which the angle A of the irradiation light with respect to the plane 23 of the glass plate 22 is the same and the directions of the irradiation light L2 and the irradiation light L3 are opposite.
4 for irradiation.

According to this configuration, the amount of light incident on the photographic dry plate 20 can be increased. Further, the incident light quantity can be further averaged. This makes it possible to obtain an image with high contrast. In addition, shadows due to irradiation from one of the light sources are hardly formed.

In this embodiment, the angle A of the irradiation light with respect to the plane 23 of the glass plate 22 is the same, and the irradiation light L
2 and the image restoration apparatus 1a including a pair of second light sources 10 and 14 in which the directions of the irradiation light L3 are opposite to each other. However, a plurality of pairs of second light sources 10 and 14 are provided. A method of restoring the original image from the photographic plate 20 using an image restoration device may be used.

By doing so, the amount of light incident on the photographic plate 20 can be further increased. Further, the incident light quantity can be further averaged. As a result, an image with higher contrast can be obtained. In addition, shadows due to irradiation from one of the light sources are further less likely to occur.

(Third embodiment)
In the first embodiment and the second embodiment, the image is taken by the digital camera 2 from the emulsion 21 side of the photographic dry plate 20, but in the third embodiment, the image is taken by the digital camera 2 from the glass plate 22 side of the photographic dry plate 20.

FIG. 9 is a diagram illustrating main components constituting the image restoration apparatus according to the third embodiment. As shown in FIG. 9, the emulsion 21 of the photographic plate 20 is in contact with a transparent support 13 and a glass plate 22.
Is placed facing the digital camera 2 side. Other configurations are the same as the main components constituting the image restoration apparatus in the first embodiment of FIG.

The method for restoring the original image from the photographic plate 20 in the third embodiment is shown in FIG. 2 of the first embodiment.
These steps are the same as those described with reference to the flowchart.

In the first to third embodiments, in the pattern inversion process, the first pattern is a negative pattern.
In the pattern inversion process, the second image data that is a positive pattern is inverted into a negative pattern, and the pattern is the same in the gradation value range changing process and the gradation value adding process. Using the first image data and the second image data of the negative pattern,
A method of generating the third image data which is a negative pattern may be used.

In the first to third embodiments, the image restoration apparatuses 1 and 1a including the digital camera 2 as the imaging unit have been described. However, an image restoration apparatus including a scanner as the imaging unit may be used. .

2 ... digital camera, 10, 14 ... second light source, 11 ... first light source, 12 ... light shielding unit, 2
0 ... photographic plate, 21 ... emulsion, 22 ... glass plate, 23 ... plane, A ... angle, K1, K2 ... gradation value, L1, L2, L3, L10, L11 ... irradiation light, L12, L13, L14 ... scattering light.

Claims (4)

A photographic recording medium in which an emulsion is coated on a transparent support member is irradiated by a first light source in a direction perpendicular to the plane of the transparent support member, and the transmitted light transmitted through the photographic recording medium is imaged by an imaging unit, A transmitted light imaging step of generating first image data;
Irradiated in a direction oblique to the plane of the transparent support member by a second light source, blocks light from the opposite side of the photographic recording medium from the second light source, and scattered light from the photographic recording medium A scattered light imaging step of capturing the image by the imaging unit and generating second image data;
Using the image processing unit, the first image data and the second image data are made the same pattern by inverting one pattern of the first image data and the second image data. Pattern reversing process to perform,
A gradation value range changing step of changing a range of gradation values of the first image data and the second image data having the same pattern by the pattern inversion step, using the image processing unit;
In the first image data and the second image data whose gradation value range has been changed by the gradation value range changing step, gradation values are added at the same pixel position using the image processing unit. And a gradation value adding step of generating third image data thereby, and a restoration method for restoring an original image from a photographic recording medium. A restoration method for restoring an original image from the photographic recording medium according to claim 1,
In the scattered light imaging step, a restoration method for restoring an original image from a photographic recording medium, wherein an angle of irradiation light with respect to the plane of the transparent support member is changed by changing an attitude of the second light source. A restoration method for restoring an original image from the photographic recording medium according to claim 1 or 2,
In the scattered light imaging step, irradiating is performed by a pair of second light sources in which the angle of the irradiation light with respect to the plane of the transparent support member is the same and the direction of the irradiation light is opposite. A restoration method for restoring an original image from a medium. A restoration method for restoring an original image from the photographic recording medium according to any one of claims 1 to 3,
The restoration method for restoring an original image from a photographic recording medium, wherein the photographic recording medium is a photographic plate.

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