Image exposure device, image exposure method and recording medium

Abstract

The CPU included in the image display device of the image exposure device displays a display image for split exposure having a split grayscale value of a split recording image on a display unit of the image display device, and sequentially performs multiple exposures of a photosensitive recording medium using the display image for split exposure to perform split exposure for recording the recording image on the photosensitive recording medium.

Description

Technical Field

[0001] The invention relates to an image exposure device, an image exposure method and a recording medium. Background Art

[0002] There is known an image exposure device that records a recording image corresponding to a display image displayed by an image display device on a photosensitive material such as a photosensitive recording medium by exposing the photosensitive material to light irradiated from an image display device.

[0003] For example, in the technology described in Japanese Patent Application Laid-Open No. 2001-45342, there is known a technology for exposing a display image displayed on a liquid crystal display to a photosensitive material by guiding light from the liquid crystal display to the photosensitive material. In addition, in the technology described in Japanese Patent Application Laid-Open No. 2001-45342, an optical fiber array is provided between the liquid crystal display and the photosensitive material as a guiding mechanism for guiding light from the liquid crystal display to the photosensitive material. Summary of the invention

[0004] Technical issues to be solved by the invention

[0005] When a photosensitive material such as a photosensitive recording medium is exposed to light irradiated from an image display device, the grayscale of the recorded image recorded on the photosensitive material depends on the grayscale of the display image displayed on the image display device for exposure. In other words, the grayscale that can be displayed in the recorded image depends on the grayscale of the image display device.

[0006] Therefore, there is a situation where a recorded image with more grayscales than the grayscale of the display image displayed on the image display device cannot be recorded on the photosensitive material. In the technology described in the above-mentioned Japanese Patent Publication No. 2001-45342, the grayscale of the display image displayed on the liquid crystal display is the same as the grayscale of the recorded image recorded on the photosensitive material.

[0007] The present invention has been made in view of such circumstances, and an object of the present invention is to provide an image exposure device, an image exposure method, and a program capable of recording a recording image having a higher grayscale than the grayscale of a display image displayed on an image display device on a photosensitive recording medium.

[0008] Means for solving technical problems

[0009] The image exposure device of the first mode of the present invention comprises: an image display device having a plurality of pixels; a support portion, which supports the photosensitive recording medium for recording a display image displayed in the image display device so that an exposure surface of the photosensitive recording medium is opposite to the image display device; a limiting component, which is arranged between the image display device and the support portion and limits the angle of light irradiated from the image display device to the photosensitive recording medium; at least one processor; and a memory, which stores commands executable by the processor, wherein the processor causes a display image for split exposure having split grayscale values ​​of the split recording image to be displayed on the image display device, and multiple exposures of the photosensitive recording medium are sequentially performed using the display image for split exposure, thereby performing split exposure to record the recording image on the photosensitive recording medium.

[0010] Furthermore, according to the image exposure device of the first embodiment, in the image exposure device of the second embodiment of the present invention, the sum of the segmented grayscale values ​​of the display image for the segmented exposure used in each exposure in the segmented exposure is greater than the maximum grayscale number which is the maximum value of the grayscale number that can be displayed on the image display device.

[0011] Furthermore, according to the image exposure device of the second aspect, in the image exposure device of the third aspect of the present invention, the sum of the divided grayscale values ​​is the same as the grayscale value of the recorded image.

[0012] Furthermore, in the image exposure device according to any one of the first to third modes, in the image exposure device of the fourth mode of the present invention, the number of exposures in the split exposure is an integer rounded to the first decimal place of the value obtained by dividing the grayscale number of the recorded image by the maximum grayscale number.

[0013] Furthermore, according to the image exposure device of any one of the first to fourth aspects, in the image exposure device of a fifth aspect of the present invention, each exposure time in the divided exposure is the same.

[0014] Furthermore, in the image exposure device according to the fifth aspect, in the image exposure device according to the sixth aspect of the present invention, the exposure time for each split exposure is the exposure time of a recording image with the maximum number of grayscales that can be recorded on a photosensitive recording medium using a display image with the maximum number of grayscales divided by the number of exposure times.

[0015] Furthermore, in the image exposure device according to any one of the first to sixth modes, in the image exposure device of the seventh mode of the present invention, the processor determines a segmentation grayscale value of a display image for split exposure used in each exposure in the split exposure, and controls the amount of light of the display image for the split exposure based on the determined segmentation grayscale value.

[0016] Furthermore, in the image exposure device according to the 7th mode, in the image exposure device of the 8th mode of the present invention, the difference between the segmentation grayscale value of the display image for the segmented exposure used in the nth exposure in the segmented exposure and the segmentation grayscale value of the display image for the segmented exposure used in the (n+1)th exposure is 1 or -1.

[0017] Furthermore, in the image exposure device according to any one of the first to eighth modes, in the image exposure device of the ninth mode of the present invention, image data of an input image having a grayscale value identical to a grayscale value of a recorded image is input, and the processor generates a display image for split exposure from the input image.

[0018] Furthermore, in the image exposure device according to any one of the first to ninth modes, in the image exposure device of the tenth mode of the present invention, the processor generates a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component from the color input image represented by the input image data, so that the display image for split exposure of the R component, the display image for split exposure of the G component, and the display image for split exposure of the B component are displayed in sequence on the image display device in a predetermined order, and split exposure is performed on each color of RGB.

[0019] Furthermore, according to the image exposure device of the tenth embodiment, in the image exposure device of the eleventh embodiment of the present invention, the total amount of light used to expose the photosensitive recording medium is specified for each RGB color, and the processor sequentially exposes the photosensitive recording medium using a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component, with an exposure time corresponding to the maximum light amount and the total light amount of light of each RGB color displayed in the image display device, and performs split exposure on each RGB color.

[0020] Furthermore, in the image exposure device according to any one of the first to eleventh modes, in the image exposure device according to the twelfth mode of the present invention, the processor generates a display image for split exposure that degrades the image quality of the input image by emphasizing the concentration difference of the high-frequency components of the input image represented by the input image data.

[0021] Furthermore, in the image exposure apparatus according to any one of the first to twelfth aspects, in a thirteenth aspect of the present invention, the limiting member may be an optical member of a diffusion optical system.

[0022] Furthermore, the image exposure method of the 14th embodiment of the present invention is an image exposure method of an image exposure device, wherein the image exposure device comprises: an image display device having a plurality of pixels; a support portion, which supports the photosensitive recording medium for recording a display image displayed in the image display device so that an exposure surface of the photosensitive recording medium is opposite to the image display device; and a limiting component, which is arranged between the image display device and the support portion and limits the angle of light irradiated from the image display device to the photosensitive recording medium. In the image exposure method, a computer performs the following processing: a display image for split exposure having split grayscale values ​​for splitting the recorded image is displayed on the image display device, and multiple exposures of the photosensitive recording medium are sequentially performed using the display image for split exposure, thereby performing split exposure to record the recorded image on the photosensitive recording medium.

[0023] Furthermore, the program of the 15th mode of the present invention is used to cause a computer to perform the following processing on an image exposure device: a display image for split exposure having split grayscale values ​​of a split recording image is displayed on an image display device, and multiple exposures of a photosensitive recording medium are sequentially performed using the display image for split exposure, so as to perform split exposure for recording the recorded image on the photosensitive recording medium, wherein the image exposure device comprises: an image display device having a plurality of pixels; a supporting portion for supporting the photosensitive recording medium for recording the display image displayed in the image display device so that an exposure surface of the photosensitive recording medium is opposite to the image display device; and a limiting component for limiting the angle of light irradiated from the image display device to the photosensitive recording medium.

[0024] Effects of the Invention

[0025] According to the present invention, it is possible to record an image having a higher grayscale than the grayscale of a display image displayed on an image display device on a photosensitive recording medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an exploded perspective view of an example of the image exposure device according to the first embodiment.

[0027] Figure 2 It is a cross-sectional view of an example of the image exposure apparatus according to the first embodiment.

[0028] Figure 3 This is a diagram showing an example of a pixel according to the first embodiment.

[0029] Figure 4 This is a block diagram showing an example of the functional configuration of the image display device according to the first embodiment.

[0030] Figure 5 A diagram for explaining the hardware configuration of the image display device according to the first embodiment.

[0031] Figure 6 This is a schematic cross-sectional view for explaining the traveling direction of light in the image exposure device according to the first embodiment.

[0032] Figure 7 This is a diagram showing the structure of an example of a louver film according to the first embodiment.

[0033] Figure 8 This is a diagram showing the structure of another example of the louver film according to the first embodiment.

[0034] Fig.9A This is a diagram showing the structure of another example of the louver film according to the first embodiment.

[0035] Fig. 9B This is a diagram showing the structure of another example of the louver film according to the first embodiment.

[0036] Fig.10 This is a diagram for explaining the diffusion of light that passes through a louver film.

[0037] Fig.11 A diagram for explaining the difference between a display image and a recorded image.

[0038] Fig. 12A This is a diagram for explaining an example of high-frequency component emphasis processing.

[0039] Fig. 12B This is a follow-up for explaining an example of high-frequency component emphasis processing. Fig. 12A The picture after.

[0040] Fig. 12C This is a follow-up for explaining an example of high-frequency component emphasis processing. Fig. 12B The picture after.

[0041] Fig.13 This is a graph for explaining a preferred range of the passivation mask process performed by the image generating unit of the image display device according to the first embodiment.

[0042] Fig.14 This is a diagram showing an example of the correspondence between the grayscale value of the recorded image, the segmented grayscale value of the display image for segmented exposure, and the total amount of light (total light amount) irradiated to the photosensitive recording medium.

[0043] Fig.15 The diagram shows an example of the correspondence between the grayscale value of the recorded image, the grayscale value of the displayed image, and the amount of light irradiated onto the photosensitive recording medium 14 when a 256-grayscale recorded image is recorded on the photosensitive recording medium by one exposure.

[0044] Fig.16 This is a flowchart of an example of exposure processing executed by the image display device according to the first embodiment.

[0045] Fig.17 This is a timing chart showing an example of divided exposure according to the first embodiment.

[0046] Fig.18 This is a graph showing an example of spectral characteristics of an arbitrary image display device.

[0047] Fig.19 This is a graph showing an example of the spectral characteristics of an image display device adjusted to optimize the color tone of a recorded image recorded on an arbitrary photosensitive recording medium.

[0048] Fig. 20 This is a flowchart showing an example of the flow of exposure time optimization processing for optimizing the exposure time.

[0049] Fig.21 This is a diagram showing an example of an evaluation system of spectral characteristics (brightness) used for optimizing the exposure time.

[0050] Fig. 22 This is a diagram for explaining blurring that occurs in a recorded image when the exposure time is optimized.

[0051] Fig.23 This is a flowchart of an example of exposure processing executed by the image display device according to the second embodiment.

[0052] Fig.24 This is a timing chart showing an example of divided exposure according to the second embodiment.

[0053] Fig.25 It is a timing chart showing a modification example of split exposure. DETAILED DESCRIPTION

[0054] Hereinafter, the image exposure device according to the present embodiment will be described with reference to the drawings.

[0055] [First embodiment]

[0056] (Image exposure device)

[0057] First, the structure of the image exposure device of this embodiment is demonstrated. Figure 1 An exploded perspective view of an example of the image exposure device of this embodiment is shown in FIG. Figure 2 A cross-sectional view of an example of the image exposure apparatus according to the present embodiment is shown in FIG.

[0058] like Figure 1 and Figure 2As shown, the image exposure device 10 of this embodiment includes an image display device 12, a support portion 21, and a louvered film 16. The image display device 12 has a plurality of pixels 13. The support portion 21 supports a photosensitive recording medium 14 that records a recording image corresponding to a display image displayed by the image display device 12. The louvered film 16 is provided between the image display device 12 and the support portion 21, and a protective layer 17 is provided on the support portion 21 side.

[0059] [Image display device]

[0060] As the image display device 12 of this embodiment, mobile terminals such as smartphones and tablet computers, liquid crystal display devices (LCD: Liquid Crystal Display), organic EL display devices (0LED: Organic Light Emitting Diode), cathode ray tube display devices (CRT: Cathode Ray Tube), light emitting diode display devices (LED: Light Emitting Diode) and plasma display devices can be used.

[0061] The image display device 12 includes a plurality of pixels 13 as a display unit 32 for displaying a display image. Figure 2 1 shows one pixel 13 as an example of the display unit 32. The pixel 13 is the minimum unit of color information constituting the image display surface. By including the pixel 13, the image display device 12 can display an image. Figure 3 An example of the pixel 13 of this embodiment is shown in FIG. The pixel 13 includes three sub-pixels. Specifically, Figure 3 As shown, in the pixel 13, the sub-pixel 13R corresponding to the R (Red) color, the sub-pixel 13G corresponding to the G (Green) color, and the sub-pixel 13B corresponding to the B (Blue) color are arranged in a row. In the pixel display surface of the image display device 12, a plurality of pixels 13 are arranged in two dimensions. By having the pixels 13, the image display device 12 can display a color display image. In addition, the two-dimensional arrangement of the pixels 13 refers to the arrangement along the Figure 1 By setting the distance (dot pitch) between adjacent pixels 13 to be less than 200 μm, the impression of a natural scene can be enhanced in the recorded image. Therefore, the dot pitch of the pixels 13 is preferably less than 150 μm, more preferably less than 125 μm, and further preferably less than 85 μm.

[0062] A glass window 26 is provided on the side of the image display device 12 that is irradiated with light to protect the pixel 13. In order to shorten the distance from the pixel 13 to the photosensitive recording medium 14, the thickness of the glass window 26 is preferably thin.

[0063] and, Figure 4 A block diagram showing an example of the functional configuration of the image display device 12 of the present embodiment is shown in . The image display device 12 of the present embodiment includes an image generating unit 30 , a control unit 31 , and a display unit 32 .

[0064] Furthermore, the image generating unit 30 of the present embodiment generates a display image in which the image quality of the input image is degraded by emphasizing the density difference of the high-frequency component of the input image, and outputs image data representing the generated display image to the control unit 31 .

[0065] The control unit 31 displays a display image corresponding to the input image represented by the image data input from the image generating unit 30 on the display unit 32 , thereby exposing the photosensitive recording medium 14 and performing control to record the recorded image corresponding to the input image represented by the image data on the photosensitive recording medium 14 .

[0066] In the image exposure device 10 of the present embodiment, it is possible to make the grayscale of the recorded image larger than the grayscale of the display image displayed on the display unit 32. Therefore, the control unit 31 performs control such that a recorded image having a grayscale number larger than the maximum grayscale number which is the maximum value of the grayscale number that can be displayed on the display unit 32 is recorded on the photosensitive recording medium 14. The grayscale number of the input image in the present embodiment is the same as the grayscale number of the recorded image. Therefore, for example, in the image exposure device 10 of the present embodiment, when the display unit 32 is a 256-grayscale (8-bit) liquid crystal display and the grayscale of the input image is 1024 grayscales, a recorded image of 1024 grayscales can be recorded on the photosensitive recording medium 14. In addition, the specific structure of the display unit 32 is not particularly limited, and it is sufficient to have the above-mentioned pixels 13 and irradiate light corresponding to the display image displayed by the pixels 13. As such a display unit 32, for example, a liquid crystal irradiated with light by a lamp such as a back light can be applied, and for example, a light emitting diode irradiating light by itself can also be applied.

[0067] The control unit 31 of this embodiment displays a display image for split exposure having split grayscale values ​​for splitting the grayscale values ​​of the recorded image on the display unit 32, and performs multiple exposures of the photosensitive recording medium 14. The control unit 31 controls the total amount of light irradiated to the photosensitive recording medium 14 to be the amount of light corresponding to the grayscale of the input image by performing multiple exposures, thereby recording a recorded image having the same grayscale as the grayscale of the input image on the photosensitive recording medium 14. Hereinafter, the present exposure method in which the display image for split exposure having split grayscale values ​​for splitting the recorded image is displayed on the display unit 32, thereby enabling exposure of a recorded image having more grayscales than the maximum grayscale number of the display unit 32, is referred to as "split exposure".

[0068] Furthermore, the control unit 31 of the present embodiment generates a display image for split exposure of the R (Red) component, a display image for split exposure of the G (Green) component, and a display image for split exposure of the B (Blue) component from the display image as a color image. Furthermore, the control unit 31 causes the display image for split exposure of the R component, the display image for split exposure of the G component, and the display image for split exposure of the B component to be sequentially displayed on the display unit 32 in a predetermined order.

[0069] By sequentially displaying the display image for split exposure of the R component, the display image for split exposure of the G component, and the display image for split exposure of the B component on the display unit 32, the photosensitive recording medium 14 is sequentially exposed to the display image for split exposure of the R component, the display image for split exposure of the G component, and the display image for split exposure of the B component. Hereinafter, for convenience, this exposure method is referred to as "RGB sequential exposure". In addition, although it is referred to as "RGB sequential exposure", the exposure order is arbitrary and is not limited to the order of RGB.

[0070] Next, refer to Figure 5 , the hardware structure of the image display device 12 is described. Figure 5 As shown, the image display device 12 has a computer including a CPU (Central Processing Unit) 40, a memory 42 as a temporary storage area, and a non-volatile storage unit 46. In addition, the image display device 12 includes the above-mentioned display unit 32 and an input unit 48. The CPU 40, the memory 42, the storage unit 46, the input unit 48, and the display unit 32 are connected via a bus 49.

[0071] The storage unit 46 is implemented by a HDD (Hard Disk Drive), an SSD (Solid State Drive), a flash memory, or the like. The storage unit 46 as a storage medium stores an exposure processing program 50. The CPU 40 reads the exposure processing program 50 from the storage unit 46, and expands the read exposure processing program 50 to the memory 42 for execution. The CPU 40 executes the exposure processing program 50, thereby the CPU 40 functions as a memory. Figure 4 The image generating unit 30 and the control unit 31 shown in the figure function.

[0072] The image data of the input image is input to the input unit 48. As described above, the grayscale of the input image in the present embodiment is 1024 grayscales. As an example, the image data of the input image is image data in which a grayscale value (a grayscale value corresponding to 1024 grayscales) is added to each pixel of the 256 grayscale image. In addition, the image data of the input image may be input from outside the image display device 12 or the image exposure device 10. In the case where the image display device 12 or the image exposure device 10 itself has a function of forming an image or photographing an image, the image data formed or photographed by itself may be input.

[0073] [Supporting part]

[0074] The support part 21 of this embodiment supports the photosensitive recording medium 14 in a state arranged at a position facing the surface of the irradiated light of the image display device 12. In addition, the support part 21 may directly support the photosensitive recording medium 14 or may indirectly support the photosensitive recording medium 14, and its structure is not particularly limited as long as it can support the photosensitive recording medium 14.

[0075] [Photosensitive recording medium]

[0076] like Figure 2 As shown, the photosensitive recording medium 14 of this embodiment has an exposure surface 14A. The photosensitive recording medium 14 is not particularly limited as long as it can be exposed by light irradiated from the image display device 12 and can form a recorded image. For example, a film cartridge 18 mounted on an instant camera (for example, Instax (registered trademark) (trade name: Checky) manufactured by Fujifilm Corporation) can be used.

[0077] The film box 18 is formed by installing the photosensitive recording medium 14 in the housing 20. A light shielding sheet (not shown) is provided between the plurality of photosensitive recording media 14 provided in the housing 20, and only the photosensitive recording medium 14 located on the uppermost surface of the film box 18 is exposed by the light shielding sheet. In addition, in the case of the film box 18 suitable for installation in the above-mentioned Instax (registered trademark), the photosensitive recording medium 14 and the light shielding sheet are assembled in the film. As the material used in the photosensitive recording medium 14, for example, photographic photosensitive materials such as negative film, reversal film, photographic paper, single-sheet or peel-apart instant photographic film can be cited.

[0078] like Figure 2 As shown, a plurality of photosensitive recording media 14 are accommodated in a box-shaped housing 20 having light shielding properties. The housing 20 is provided with an exposure opening 22, which allows light irradiated from the image display device 12 to pass in order to expose the exposure surface of the photosensitive recording medium 14. In addition, a pressing member (not shown) is provided on the side opposite to the exposure opening 22, and the photosensitive recording medium 14 is pressed to the side of the exposure opening 22 by the pressing member. As a result, the photosensitive recording medium 14 is pressed around the exposure opening 22, the distance between the photosensitive recording medium 14 and the image display device 12 is reduced, and a good image can be recorded on the photosensitive recording medium 14.

[0079] As the housing 20, a resin member for recording materials used in various recording materials such as photographic photosensitive materials, magnetic recording materials, and optical recording materials can be used. The resin member for recording materials refers to a container, a cover, and its accessory parts for storing, packaging, covering, protecting, carrying, storing, and supporting the above-mentioned recording materials, or various parts that carry the above-mentioned recording materials and perform functions.

[0080] The exposed photosensitive recording medium 14 passes between unwinding rollers (not shown), whereby the capsule provided on the photosensitive recording medium is ruptured. The capsule contains a developing solution, and when the capsule is ruptured, the developing solution spreads into the inside of the photosensitive recording medium 14. After 1 minute to several minutes, the development process is fully performed and a recorded image is formed on the photosensitive recording medium 14.

[0081] [Louvre film]

[0082] refer to Figure 6 and Figure 7 , an example of the louver film 16 of this embodiment will be described. Figure 6 It is a schematic cross-sectional view of an example of the image exposure device 10 according to the present embodiment, and is a diagram for explaining the traveling direction of light from the pixel 13 . Figure 716 is a diagram showing a structure of an example of the louver film 16 of the present embodiment. Reference numeral 16A indicates a plane 16A of the louver film 16, and reference numeral 16B indicates a side surface 16B of the louver film 16. The louver film 16 is parallel to the arrangement surface of the pixels 13 of the image display device 12 in a first direction ( Figure 7 In the X direction of the plane 16A, light-transmitting portions 102 that transmit light and light-shielding portions 104 that shield light are alternately arranged. The light-transmitting portions 102 and light-shielding portions 104 arranged in the first direction of this embodiment are an example of the first light-transmitting portions and the first light-shielding portions of the present invention.

[0083] Furthermore, the louver film 16 is perpendicular to the first direction and parallel to the arrangement surface of the pixels of the image display device in the second direction ( Figure 7 The light-transmitting portions 102 and the light-shielding portions 104 are alternately arranged in the Y direction of the plane 16A. The light-transmitting portions 102 and the light-shielding portions 104 arranged in the second direction of this embodiment are an example of the second light-transmitting portions and the second light-shielding portions of the present invention.

[0084] Thus, in this embodiment, the light-transmitting portion 102 is arranged two-dimensionally, and the light-shielding portion 104 is formed in a lattice shape. Figure 6 As shown, the angle of light irradiated from the pixel 13 of the image display device 12 to the exposure surface 14A of the photosensitive recording medium 14 is limited. The louver film 16 of this embodiment is an example of the limiting member of the present invention.

[0085] The light irradiated from the pixel 13 of the image display device 12 is irradiated in all directions of 180° from the image display surface. The irradiated light enters the louver film 16 through the glass window 26 provided in the image display device 12. Among the light incident on the louver film 16, the light parallel to the straight line connecting the image display device 12 and the photosensitive recording medium 14 passes through the light-transmitting portion 102 of the louver film 16. In addition, the light irradiated obliquely with respect to the straight line connecting the image display device 12 and the photosensitive recording medium 14 is shielded by the light shielding portion 104 in the louver film 16. By limiting the angle of the light irradiated from the image display device 12, the image quality of the recorded image recorded on the photosensitive recording medium 14 is improved.

[0086] The light-transmitting portion 102 can be made of any material as long as it allows light to pass through, and glass materials, transparent silicone rubber, etc. can be used. In addition, a part of the light-transmitting portion 102 can be set as a cavity, and the louver-type film 16 can be composed only of the light-shielding portion 104. The light-shielding portion 104 can be used as a light-absorbing component that absorbs light, and can also be used as a light-reflecting component that reflects light. The light-shielding component 106 that constitutes the light-shielding portion 104 can be made of a colored resin material, for example, black silicone rubber, etc. can be used. In addition, as a material that absorbs light, a neutral density filter (ND (Neutral Density) filter) can be used. The ND filter refers to a neutral optical density filter, which is a filter that can uniformly absorb light (absorption rate is greater than 50% and less than 99.999%; transmittance is greater than 0.001% and less than 50%) in the wavelength region used for exposure without affecting the wavelength.

[0087] In addition, the structure of the louver film 16 is not limited to this embodiment. Figure 8 Another example of the structure of the louver film 16 is shown in FIG. Figure 7 The louver film 16 shown is formed of one layer as shown in the side surface 16B. The louver film 16 is two-dimensionally arranged by alternately arranging the light-transmitting portions 102 and the light-shielding portions 104 in the first direction and the second direction on the one layer.

[0088] on the other hand, Figure 8 The louver film 16 shown in the figure is composed of two layers, the first layer 118 and the second layer 119. Reference numeral 16B is the side surface of the louver film 16, reference numeral 118A is the plane of the first layer 118, and reference numeral 119A is the plane of the second layer 119. As shown in the plane 118A of the first layer 118, the first layer 118 is only in the first direction (in the Figure 8 The light-transmitting portions 102 and the light-shielding portions 104 are alternately arranged in the plane 118A (in the X direction). In addition, the second layer 119 is formed only in the second direction (in the X direction) perpendicular to the first direction. Figure 8 The light-transmitting portions 102 and the light-shielding portions 104 are alternately arranged on the plane 119A (in the Y direction). Furthermore, by stacking the first layer 118 and the second layer 119, a two-dimensional louver film 16 is formed. In this way, even if the two-dimensional louver film 16 is formed by a plurality of layers, the same effect as the louver film 16 formed by a single layer can be obtained.

[0089] And, if Fig.9AAs shown, a protective layer 117 for preventing the louver film 16 from being damaged or broken may be provided on the surface of the louver film 16. Specifically, the louver film 16 may be provided with a protective layer 117 on a plane 118A on the side opposite to the side adjacent to the second layer 119 in the first layer 118 and a plane 119A on the side opposite to the side adjacent to the first layer 118 in the second layer 119. Fig.9A As shown, when the protective layers 17 are provided on both sides of the louver film 16 , defects of the image caused by defects or structures of the louver film 16 can be made less noticeable.

[0090] The protective layer 117 is not particularly limited as long as it is transparent and can allow light to pass therethrough. For example, a plastic plate made of acrylic resin, polycarbonate, vinyl chloride resin, or the like can be used as the protective layer 117 .

[0091] In addition, if Fig. 9B As shown, at least one light shielding portion 104 in each column and each row may be composed of a plurality of light shielding members 106 with intervals. Fig. 9B In the example shown, on the first layer 118, each column of the light shielding portions 104 arranged along the first direction has a plurality of light shielding members 106 arranged at predetermined intervals along the second direction. Furthermore, on the second layer 119, each row of the light shielding portions 104 arranged along the second direction has a plurality of light shielding members 106 arranged at predetermined intervals along the first direction.

[0092] The dot pitch P of the light shielding portion 104 of the louver film 16 is preferably 80 μm or less, more preferably 65 μm or less. By setting the dot pitch P of the light shielding portion 104 to the above range, oblique light from the light emitted from the pixel 13 can be shielded, and the quality of the recorded image can be improved.

[0093] Furthermore, the light shielding portion 104 may be arranged so that an angle difference is formed between the XY axis of the pixel, which is the basis for the arrangement of the pixel 13, and the XY axis of the louver, which is the basis for the arrangement of the light-transmitting portion 102 and the light shielding portion 104 of the louver-type film 16. The interference ripples of the recorded image are suppressed by arranging so that an angle difference exists between the XY axis of the pixel 13 and the XY axis of the louver. The angle difference is preferably 1 to 45 degrees, more preferably 5 to 40 degrees, and more preferably 10 to 35 degrees.

[0094] The thickness t of the louver film 16 is preferably 1.5 mm or more and 4.0 mm or less, more preferably 2.0 mm or more and 4.0 mm or less, and further preferably 2.5 mm or more and 4.0 mm or less. By increasing the thickness t of the louver film 16, it is possible to shield oblique light with a small angle relative to parallel light. In addition, if the thickness t of the louver film 16 is increased, the recorded image is likely to become blurred, so it is preferred to set the thickness t of the louver film 16 to the above range. Figure 7 When the louver film 16 shown in FIG. 1 is formed of one layer, the thickness t of the louver film 16 is the thickness of one layer. Figure 8 When the louvered film 16 shown in FIG. 9 is formed of multiple layers such as two layers, namely, the first layer 118 and the second layer 119 , the total thickness of the multiple layers is the thickness t of the louvered film 16 .

[0095] [Protective layer]

[0096] like Figure 1 , Figure 2 and Figure 6 As shown, the protective layer 17 is provided on the support portion 21 side of the louvered film 16. When exposure is performed, the protective layer 17 protects the louvered film 16 during contact between the photosensitive recording medium 14 and the louvered film 16. The protective layer 17 prevents the louvered film 16 from being damaged or broken by repeatedly exposing the display image displayed on the image display device 12 to the photosensitive recording medium 14.

[0097] The protective layer 17 is not particularly limited as long as it is transparent and can allow light to pass therethrough. As the protective layer 17 , for example, a plastic plate made of acrylic resin, polycarbonate, vinyl chloride resin, or the like can be used.

[0098] The thickness of the protective layer 17 is preferably set to 0.1 μm or more and 500 μm or less. By setting the thickness of the protective layer 17 to 0.1 μm or more, in addition to having the effect of protecting the louvered film 16, interference ripples can be made less noticeable. In addition, defects of the image caused by defects or structures of the louvered film 16 can be made less noticeable. In addition, by setting the thickness of the protective layer 17 to 500 μm or less, blurring of the recorded image can be prevented.

[0099] [Function of the Image Generating Unit 30]

[0100] Next, the operation of the image generating unit 30 in the image display device 12 of the present embodiment will be described.

[0101] As described above, the louver film 16 limits the angle of light emitted from the image display device 12, and light parallel to the straight line connecting the image display device 12 and the photosensitive recording medium 14 passes through the light-transmitting portion 102 of the louver film 16. Fig.10 As shown in FIG. 1 , the light irradiated from the point light source 15 of the display unit 32 is diffused. Specifically, the light component of a predetermined angle is transmitted according to the height H of the light shielding portion 104 and the width Q of the light transmitting portion 102, that is, diffused. Fig.11 As shown, in the recorded image recorded on the photosensitive recording medium 14, the density difference of the high-frequency component (edge ​​portion) E is reduced compared to the displayed image. That is, in the recorded image, the density difference becomes smaller, so there is a tendency that the edge portion is difficult to visually recognize, and as a result, the possibility that the recorded image becomes a blurred image increases.

[0102] As the thickness t of the louvered film 16 increases, the amount of light reaching the photosensitive recording medium 14 from the image display device 12 decreases, so there is a problem that the exposure time is very long. Figure 8 Or in the example shown in FIG9 , when the louvered film 16 is formed of a plurality of layers, light generated in each layer is diffused in a direction not shielded by the light shielding portion 104, so that blur is likely to occur in the recorded image. In addition, as the thickness of the protective layer 117 becomes thicker, the distance between the photosensitive recording medium 14 and the exposure surface 14A becomes larger, and the angle of light is not restricted in the protective layer 117, so blur is likely to occur in the recorded image.

[0103] Therefore, in this embodiment, considering the situation where the concentration difference in the recorded image is smaller than the concentration difference in the displayed image, the image generation unit 30 of the image display device 12 performs high-frequency component emphasis processing for pre-increasing (emphasizing) the high-frequency component (edge ​​portion) of the displayed image as image processing.

[0104] The image generation unit 30 of the present embodiment performs a passivation mask process as an example of a high-frequency component emphasis process. Specifically, first, a passivation mask is generated. When the passivation mask is generated, for example, a two-dimensional Gaussian distribution is applied in which f(x, y) is set as a filter coefficient and the distribution degree is set as a standard deviation σ as shown in the following formula (1).

[0105] [Formula 1]

[0106]

[0107] In addition, the standard deviation σ in the above formula (1) is Gaussian distribution, that is, the blur radius of the blurred image, and is expressed as the number of pixels (Number of pixels) in this embodiment.

[0108] The unsharp mask expressed by the above formula (1) is superimposed on the input image, thus: Fig. 12A As shown, a blurred image is generated from an input image.

[0109] In addition, if Fig. 12B As shown in FIG. 1 , the image generating unit 30 generates a high-frequency component image from the difference between the input image and the blurred image. Fig. 12B As shown, in the high-frequency component image, the difference becomes larger especially in the area where the grayscale difference is large.

[0110] Moreover, if Fig. 12C As shown, the image generation unit 30 generates a display image with the high-frequency components emphasized by adding the high-frequency component image to the input image according to the weight W. That is, the display image is in a state of deteriorated image quality compared to the input image.

[0111] In addition, when the resolution of the image display device 12 is 325 ppi (pixel per inch), in the unsharp mask processing applied to the input image, the standard deviation σ is marked as x and the weight W is marked as y. Fig.13 As shown, the range of the applicable passivation mask is preferably a range M1 represented by the following formula (2), more preferably a range M2 represented by the following formula (3), and even more preferably a range M3 represented by the following formula (4).

[0112] -0.1×x+0.40<y<-0.1×x+1.10…(2)

[0113] -0.1×x+0.50<y<-0.1×x+1.00…(3)

[0114] -0.1×x+0.60<y<-0.1×x+0.90…(4)

[0115] In addition, when the resolution of the image display device 12 is Xppi, a passivation mask corresponding to the range of the standard deviation σ of the above-mentioned formulas (2) to (4) multiplied by the number obtained by dividing X by 325 may be applied. Specifically, a passivation mask corresponding to the range M1 to M3 represented in each of the following formulas (5) to (7) may be applied.

[0116] -0.1×x×(X÷325)+0.40<y<-0.1×x×(X÷325)+1.10…(5)

[0117] -0.1×x×(X÷325)+0.50<y<-0.1×x×(X÷325)+1.00…(6)

[0118] -0.1×x×(X÷325)+0.60<y<-0.1×x×(X÷325)+0.90…(7)

[0119] [Function of the control unit 31]

[0120] Next, the operation of the control unit 31 of the image display device 12 according to the present embodiment will be described.

[0121] As described above, in the image exposure device 10 of the present embodiment, a display image for split exposure having split gradation values ​​is displayed multiple times on the display unit 32, and the photosensitive recording medium 14 is exposed multiple times, thereby performing split exposure, and this split exposure can perform exposure of a recording image having more gradations than the maximum gradation number of the display unit 32. The number of exposures, exposure time, and split gradation values ​​in this split exposure are described.

[0122] First, the number of exposures in split exposure (hereinafter referred to as "exposure number") is described. The exposure number is determined based on the grayscale number of the recorded image and the maximum grayscale number of the display unit 32. As an example, in the present embodiment, the exposure number when the grayscale number of the recorded image is set to X grayscale and the maximum grayscale number of the display unit 32 is set to Y grayscale is set to an integer rounded to the first decimal place of the value (X / Y) calculated by dividing X by Y. For example, when the grayscale number of the recorded image is X=1024 and the maximum grayscale number of the display unit 32 is Y=256, the solution of dividing 1024 (grayscale) by 256 (grayscale) is 4.0 (1024÷256=4.0), so the exposure number is 4 times.

[0123] Next, the exposure time of each split exposure (hereinafter referred to as "split exposure time") is described. In the image exposure device 10 of the present embodiment, the split exposure time is set to be the same. In addition, the exposure time of each time can be different, but since the reciprocity failure corresponding to the exposure time sometimes occurs, it is preferable to set the exposure time of each time to be the same as in the present embodiment. Therefore, in the present embodiment, the exposure time (hereinafter referred to as "appropriate exposure time") which is predetermined as the exposure time for recording the recording image with the maximum number of grayscales on the photosensitive recording medium 14 using the display image with the maximum number of grayscales of the display unit 32 is divided by the value of the number of exposures and is set as the split exposure time. For example, when the maximum number of grayscales of the display unit 32 is 256 grayscales, the appropriate exposure time is 100msec, and 4 exposures are performed, the solution of 100 (msec) divided by 4 (times) is 25 (100÷4=25), so the split exposure time is 25msec.

[0124] Next, the segmentation grayscale value is described. The segmentation grayscale value is the grayscale value of the segmented recorded image. In this embodiment, for each exposure in the segmented exposure, the segmentation grayscale value of the display image for the segmented exposure is set. Fig.14 , an example of the correspondence between the grayscale value of the recorded image, the split grayscale value of the display image for split exposure used in each exposure in the split exposure, and the total amount of light (total light amount) irradiated to the photosensitive recording medium 14 is shown. Fig.14 , an example is shown in which the grayscale number of the recorded image is 1024 grayscales, the maximum grayscale number of the display unit 32 is 256 grayscales, the number of exposures is 4 times, and the divided exposure time is 25 msec. Fig.15 , an example of the correspondence between the grayscale value of the recorded image, the grayscale value of the displayed image, and the amount of light irradiated to the photosensitive recording medium 14 when a recorded image with 256 grayscales is recorded on the photosensitive recording medium 14 by one exposure without split exposure is shown. Fig.15 In FIG. 1 , an example is shown in which the appropriate exposure time is 100 msec because split exposure is not performed. Fig.14 The total amount of light in Fig.15 The light amount in φ represents a relative value when the light amount irradiated to the photosensitive recording medium 14 is set to “100” in order to record a recording image with a gradation value of “1” on the photosensitive recording medium 14 without performing split exposure.

[0125] like Fig.15 As shown, when split exposure is not performed, when the grayscale value of the recorded image is "1", exposure is performed with the grayscale value of the displayed image as "1", whereby the total amount of light irradiated to the photosensitive recording medium 14 becomes "100".

[0126] On the other hand, Fig.14 As shown, in the case of split exposure, when the grayscale value of the recorded image is "1", in the first exposure, the split grayscale value of the display image for split exposure is set to "1", in the second exposure, the split grayscale value of the display image for split exposure is set to "0", and in the third exposure, the split grayscale value of the display image for split exposure is set to "0". And, in the fourth exposure, it is shown that the split grayscale value of the display image for split exposure is set to "0". By performing four exposures using these display images for split exposure, the total amount of light irradiated to the photosensitive recording medium 14 becomes "25". In this way, even if the grayscale value of the recorded image is the same "1", the amount of light irradiated to the photosensitive recording medium 14 is different when split exposure is performed and when split exposure is not performed.

[0127] Furthermore, in order to set the grayscale value of the recorded image to "1" without performing split exposure, in the split exposure when the light quantity "100" irradiated to the photosensitive recording medium 14 becomes the total light quantity of the light irradiated to the photosensitive recording medium 14, as shown in FIG. Fig.14 As shown in FIG. 1 , the grayscale value of the recorded image becomes "4". In this case, Fig.14 As shown, in the first exposure of the split exposure, the split grayscale value of the display image for the split exposure is set to "1", in the second exposure, the split grayscale value of the display image for the split exposure is set to "1", and in the third exposure, the split grayscale value of the display image for the split exposure is set to "1". And in the fourth exposure, the split grayscale value of the display image for the split exposure is set to "1". In this way, even if the amount of light irradiated to the photosensitive recording medium 14 is the same, the grayscale value of the recorded image recorded on the photosensitive recording medium 14 is different when the split exposure is performed and when the split exposure is not performed.

[0128] Compare Fig.14 and Fig.15 As can be seen, according to the image exposure device 10 of the present embodiment, the light amount (total light amount) of the light irradiated to the photosensitive recording medium 14 can be finely set, and therefore the recorded image can be made into a multi-tone image.

[0129] In addition, the split grayscale value of the display image for split exposure in each split exposure is not limited to Fig.14 For example, when the grayscale value of the recorded image is "10", in the first exposure, the segmentation grayscale value of the display image for split exposure is set to "4", in the second exposure, the segmentation grayscale value of the display image for split exposure is set to "3", and in the third exposure, the segmentation grayscale value of the display image for split exposure is set to "2". And in the fourth exposure, the segmentation grayscale value of the display image for split exposure can be set to "1".

[0130] Furthermore, in the image exposure device 10 of the present embodiment, as Fig.14 As shown, the nth (in Fig.14, the difference between the grayscale value of the display image for the split exposure used in the exposures (n=1 to 3) and the grayscale value of the display image for the split exposure used in the exposure (n+1) is set to 1. The grayscale value difference may be different from the present embodiment, but in order to avoid the so-called high illumination inverse law failure and low illumination inverse law failure, such as the sensitivity change caused by the exposure intensity becoming too large or too small in the photosensitive recording medium 14, and to facilitate the adjustment of the exposure amount based on the γ value of the display unit 32 of the image display device 12, it is preferably set to 1 as in the present embodiment, or to -1 in a case different from the present embodiment.

[0131] In addition, as an example, in the image display device 12 of this embodiment, the divided exposure time, the number of exposures, and the above Fig.14 The shown correspondence relationship is stored in advance in the storage unit 46 .

[0132] [Exposure Processing]

[0133] Next, the exposure process executed by the image display device 12 of this embodiment will be described. Fig.16 2 is a flowchart showing an example of exposure processing executed by the image display device 12 of this embodiment. Fig.16 The exposure process shown is performed by the CPU 40 executing the exposure process program 50 .

[0134] exist Fig.16 In step S100 shown, the image generating unit 30 performs high-frequency component emphasizing processing for emphasizing the density difference of high-frequency components of the input image on the input image data as described above, and generates a display image for divided exposure with the high-frequency components emphasized.

[0135] In the next step S102, the control unit 31 generates a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component from the display image for split exposure that has been subjected to high-frequency component emphasis processing in the above-mentioned step S100. As an example, the control unit 31 of this embodiment separates the chromaticity channels of the display image for split exposure in the image processing using NumPy of the Python language and generates a display image for split exposure of each RGB component (monochrome image). In addition, the method by which the control unit 31 generates a display image for split exposure of each RGB component from the display image for split exposure is not limited to this method, and a known technique can be applied.

[0136] In the next step S104, as described above, reference is made to Fig.14The control unit 31 determines the segmentation grayscale value for each display image for the segmentation exposure of each RGB component according to the corresponding relationship shown. For example, with respect to a certain pixel 13 of the display unit 32, when the grayscale value of R is "7", the segmentation grayscale value of the pixel 13 in the first exposure is set to "2", the segmentation grayscale value in the second exposure is set to "2", and the segmentation grayscale value in the third exposure is set to "2". Furthermore, the segmentation grayscale value in the fourth exposure is determined to be "1".

[0137] In the next step S106, if Fig.17 As shown, the control unit 31 performs split exposure of the display image for split exposure based on the B component according to the split grayscale value determined in the above step S104. Fig.17 As shown, the control unit 31 performs split exposure of the display image for split exposure based on the G component according to the split grayscale value determined in the above step S104. Fig.17 As shown, the control unit 31 performs divided exposure of the display image for divided exposure based on the R component according to the divided grayscale value determined in the above-mentioned step S104.

[0138] Thus, in the exposure process of this embodiment, split exposure is performed and RGB is exposed sequentially. Fig.17 In the example shown, when the exposure start time T0 is reached, the control unit 31 displays (lights up) the display image for the split exposure of the B component on the display unit 32 with the light amount corresponding to the split grayscale value in the first exposure. The control unit 31 switches the light amount of the display image for the split exposure of the B component from the light amount corresponding to the split grayscale value in the first exposure to the light amount corresponding to the split grayscale value in the second exposure during the period from time T1 to time T2. When the grayscale of the display image for the split exposure is different between the first and second exposures, the control unit 31 switches the light amount of the display image for the split exposure of the B component from the light amount corresponding to the split grayscale value in the first exposure to the light amount corresponding to the split grayscale value in the second exposure by switching the display image for the split exposure.

[0139] In addition, when the segmentation grayscale value in the first exposure is the same as the segmentation grayscale value in the second exposure, in other words, when the grayscale of the display image for the first exposure is the same as the second exposure, the control unit 31 may not switch the display image for the exposure and may continue to display the display image being displayed as the second display image. In this case, the time for switching the display image for the exposure may not be set, so the time T1 = time T2.

[0140] When reaching the time T2, the control unit 31 displays (lights up) the display image for the split exposure of the B component on the display unit 32 with the light amount corresponding to the split grayscale value in the second exposure. Similarly, the control unit 31 switches the light amount of the display image for the split exposure of the B component from the light amount corresponding to the split grayscale value in the second exposure to the light amount corresponding to the split grayscale value in the third exposure during the period from time T3 to time T4. In addition, as described above, when the split grayscale value in the second exposure is the same as the split grayscale value in the third split exposure, the control unit 31 may not switch the display image for the split exposure and may continue to display the display image being displayed as the third display image. In this case, the time for switching the display image for the split exposure may not be set, so time T3 = time T4.

[0141] When reaching the time T4, the control unit 31 displays (lights up) the display image for the split exposure of the B component on the display unit 32 with the light amount corresponding to the split grayscale value in the third exposure. And, during the period from time T5 to time T6, the control unit 31 switches the light amount of the display image for the split exposure of the B component from the light amount corresponding to the split grayscale value in the third exposure to the light amount corresponding to the split grayscale value in the fourth exposure. In addition, as described above, when the split grayscale value in the third exposure is the same as the split grayscale value in the fourth split exposure, the control unit 31 may not switch the display image for the split exposure and may continue to display the display image being displayed as the fourth display image. In this case, the time for switching the display image for the split exposure may not be set, so time T5 = time T6.

[0142] When the time T6 is reached, the control unit 31 displays (lights up) the display image for the split exposure of the B component on the display unit 32 with the light amount corresponding to the split grayscale value in the fourth exposure. Thereafter, when the time T7 is reached, the control unit 31 does not display (turns off) the display image for the split exposure of the B component. In this way, the control unit 31 sequentially lights up the sub-pixels 13B of the pixel 13 with the light amount corresponding to the split grayscale value during the time T0 to T7, and exposes the photosensitive recording medium 14 four times with the display image for the split exposure of the B component.

[0143] Furthermore, the control unit 31 switches the image displayed on the display unit 32 from the display image for split exposure of the B component to the display image for split exposure of the G component during the period from time T7 to time T8, and when reaching time T8, displays (lights up) the display image for split exposure of the G component on the display unit 32 with the light amount corresponding to the split grayscale value in the first exposure. The display of the display image for split exposure of the G component is also controlled by the control unit 31 in the same manner as in the case of the B component described above. Specifically, the control unit 31 switches the light amount of the display image for split exposure of the G component from the light amount corresponding to the split grayscale value in the first exposure to the light amount corresponding to the split grayscale value in the second exposure during the period from time T9 to time T10. In addition, as described above, when the split grayscale value in the first exposure is the same as the split grayscale value in the second split exposure, the control unit 31 does not switch the display image for split exposure and continues to display the display image being displayed as the second display image. In this case, the time for switching the display image for split exposure does not need to be set, so time T9 = time T10.

[0144] When reaching the time T10, the control unit 31 displays (lights up) the display image for the split exposure of the G component on the display unit 32 with the light amount corresponding to the split grayscale value in the second exposure. Similarly, the control unit 31 switches the light amount of the display image for the split exposure of the G component from the light amount corresponding to the split grayscale value in the second exposure to the light amount corresponding to the split grayscale value in the third exposure during the period from the time T11 to the time T12. In addition, as described above, when the split grayscale value in the second exposure is the same as the split grayscale value in the third split exposure, the control unit 31 may not switch the display image for the split exposure and may continue to display the display image being displayed as the third display image. In this case, the time for switching the display image for the split exposure may not be set, so the time T11 = time T12.

[0145] When reaching the time T12, the control unit 31 displays (lights up) the display image for the split exposure of the G component on the display unit 32 with the light amount corresponding to the split grayscale value in the third exposure. And, during the period from time T13 to time T14, the control unit 31 switches the light amount of the display image for the split exposure of the G component from the light amount corresponding to the split grayscale value in the third exposure to the light amount corresponding to the split grayscale value in the fourth exposure. In addition, as described above, when the split grayscale value in the third exposure is the same as the split grayscale value in the fourth split exposure, the control unit 31 may not switch the display image for the split exposure and may continue to display the display image being displayed as the fourth display image. In this case, the time for switching the display image for the split exposure may not be set, so time T13 = time T14.

[0146] When reaching time T14, the control unit 31 displays (lights up) the display image for the split exposure of the G component on the display unit 32 with the light amount corresponding to the split grayscale value in the fourth exposure. Thereafter, when reaching time T15, the control unit 31 does not display (turns off) the display image for the split exposure of the G component. Specifically, the control unit 31 sequentially lights up the sub-pixels 13G of the pixel 13 with the light amount corresponding to the split grayscale value during the period from time T8 to time T15, and exposes the photosensitive recording medium 14 four times with the display image for the split exposure of the G component.

[0147] Furthermore, the control unit 31 switches the image displayed on the display unit 32 from the display image for the split exposure of the G component to the display image for the split exposure of the R component during the period from time T15 to time T16, and when reaching time T16, displays (lights up) the display image for the split exposure of the R component on the display unit 32 with the light amount corresponding to the split grayscale value in the first exposure. The display of the display image for the split exposure of the R component is also controlled by the control unit 31 in the same manner as in the case of the B component described above. Specifically, the control unit 31 switches the light amount of the display image for the split exposure of the R component from the light amount corresponding to the split grayscale value in the first exposure to the light amount corresponding to the split grayscale value in the second exposure during the period from time T17 to time T18. In addition, as described above, when the split grayscale value in the first exposure is the same as the split grayscale value in the second split exposure, the control unit 31 does not switch the display image for the split exposure and continues to display the display image being displayed as the second display image. In this case, the time for switching the display image for split exposure does not need to be set, and therefore, time T17 = time T18.

[0148] When reaching the time T18, the control unit 31 displays (lights up) the display image for the split exposure of the R component on the display unit 32 with the light amount corresponding to the split grayscale value in the second exposure. Similarly, the control unit 31 switches the light amount of the display image for the split exposure of the R component from the light amount corresponding to the split grayscale value in the second exposure to the light amount corresponding to the split grayscale value in the third exposure during the period from time T19 to time T20. In addition, as described above, when the split grayscale value in the second exposure is the same as the split grayscale value in the third split exposure, the control unit 31 may not switch the display image for the split exposure and may continue to display the display image being displayed as the third display image. In this case, the time for switching the display image for the split exposure may not be set, so time T19 = time T20.

[0149] When reaching the time T20, the control unit 31 displays (lights up) the display image for the split exposure of the R component on the display unit 32 with the light amount corresponding to the split grayscale value in the third exposure. And, during the period from time T21 to time T22, the control unit 31 switches the light amount of the display image for the split exposure of the R component from the light amount corresponding to the split grayscale value in the third exposure to the light amount corresponding to the split grayscale value in the fourth exposure. In addition, as described above, when the split grayscale value in the third exposure is the same as the split grayscale value in the fourth split exposure, the control unit 31 may not switch the display image for the split exposure and may continue to display the display image being displayed as the fourth display image. In this case, the time for switching the display image for the split exposure may not be set, so the time T21 = time T22.

[0150] When the time T22 is reached, the control unit 31 displays (lights up) the display image for the split exposure of the R component on the display unit 32 with the light amount corresponding to the split grayscale value in the fourth exposure. Thereafter, when the time T23 is reached, the control unit 31 does not display (turns off) the display image for the split exposure of the R component. Specifically, the control unit 31 sequentially lights up the sub-pixels 13R of the pixel 13 with the light amount corresponding to the split grayscale value during the time T16 to T23, and exposes the photosensitive recording medium 14 four times with the display image for the split exposure of the R component.

[0151] When the process of step S110 is completed, the present exposure process is completed. In the image exposure device 10 of the present embodiment, the recorded image having the same gradation value as the gradation value of the input image is recorded on the photosensitive recording medium 14 by the present exposure process.

[0152] [Second embodiment]

[0153] In this embodiment, an example of optimizing the exposure amount of each of RGB in the display image for split exposure for exposing the photosensitive recording medium 14 is described. In addition, since the overall structure of the image exposure device 10, the structure of the support unit 21, the photosensitive recording medium 14, and the louvered film 16 are the same as those in the first embodiment, the description thereof is omitted. On the other hand, in the image exposure device 10 of this embodiment, since the role of the control unit 31 of the image display device 12 is different, the role of the control unit 31 is described.

[0154] [Function of the control unit 31]

[0155] Sometimes, the spectral characteristics of the light irradiated from the image display device 12 to the photosensitive recording medium 14 are different from the spectral sensitivity of the photosensitive recording medium 14, specifically, the spectral sensitivity (spectral characteristics) of the photosensitive material of the photosensitive recording medium 14. If the spectral characteristics of the image display device 12 and the photosensitive recording medium 14 are different, the hue of the display image displayed in the image display device 12 is sometimes different from the hue of the recorded image recorded in the photosensitive recording medium 14, that is, the recorded image exposed by the displayed image. For example, in the image display device 12, usually, an image optimized for the spectral characteristics of the human eye is used as a display image. In this way, when the photosensitive recording medium 14 is exposed by the display image optimized for the spectral characteristics of the human eye, sometimes the hue of the recorded image recorded in the photosensitive recording medium 14 is different from the hue of the display image. For example, when the photosensitive recording medium 14 is exposed by a display image whose display image is a strong green (G) hue, a recorded image with a hue biased toward green (G) can be obtained.

[0156] When the color tone of the recorded image recorded in the photosensitive recording medium 14 is set to an image of a desired color tone, such as an image optimized for the spectral characteristics of the human eye, it is necessary to adjust the color tone of the display image displayed on the image display device 12 in order to expose the photosensitive recording medium 14. Therefore, for example, when a recorded image with a color tone biased toward green (G) is obtained as described above, the control unit 31 of this embodiment adjusts the display image (image for exposure) displayed on the image display device 12 so that the light amount of green (G) becomes smaller.

[0157] As an example of a method for adjusting the hue of a displayed image in the image display device 12 for setting the hue of a recorded image recorded in the photosensitive recording medium 14 to a desired hue, there is a method of changing the distribution value of grayscale of each RGB chromaticity. The case where the displayed image has a strong hue of green (G) means that the exposure amount of green (G) is greater than the exposure amount of other chromaticities in the exposure of the photosensitive recording medium 14. If the grayscale of the image display device 12 is 256 grayscales, the control unit 31 changes the distribution value of the grayscale of 200 pixel value for green (G) to 150 in the image data representing the input image. That is, if the pixel value for green (G) in the input image is "200", the control unit 31 adjusts the pixel value to "150". By reducing the distribution value of the grayscale in the displayed image, that is, the pixel value, the exposure amount of green (G) is reduced, and a recorded image whose hue is not biased toward green (G) can be obtained.

[0158] That is, by adjusting the grayscale distribution value of the chromaticity with a strong hue to be smaller, in other words, by adjusting the pixel value of the chromaticity with a strong hue to be smaller, the exposure amount is reduced, so that the deviation of the hue in the recorded image can be suppressed.

[0159] However, when this adjustment method is used, the grayscales originally ranging from 0 to 255 are allocated to grayscales less than 0 to 255. In other words, the number of grayscales in the recorded image becomes less than 255. Therefore, a phenomenon called grayscale jump or tone jump may occur in the recorded image.

[0160] refer to Fig.18 and Fig.19 , and explain in more detail. Fig.18 An example of the spectral characteristics of an arbitrary image display device 12 is shown in FIG. Fig.19 An example of the spectral characteristics of the image display device 12 adjusted to optimize the color tone of the recorded image recorded in any photosensitive recording medium 14 is shown in FIG. Fig.19 The example shown shows a case where the grayscale distribution value of green (G) is adjusted because the green (G) color tone is strong in the recorded image as described above. Fig.18 and Fig.19 It can be seen that the ratio of the brightness of green (G) to blue (B) is different. Fig.19 In the image display device 12 after adjustment shown, the ratio of the brightness of green (G) to that of blue (B) is small.

[0161] about Fig.18 In the spectral characteristics shown, each of red (R), green (G), and blue (B) is assigned 256 grayscales from 0 to the maximum value of brightness. Fig.19In the spectral characteristics after adjustment shown in FIG. 1 , the maximum value of the brightness of green (G) is smaller than that before adjustment, so the grayscale value that can be used is a value less than 255. Fig.19 The grayscale distribution of the maximum value of the brightness of green (G) in the adjusted spectral characteristics shown is 230, and in the adjusted image display device 12, grayscales of 231 to 255 cannot be used for green (G).

[0162] As described above, when the spectral characteristics of the image display device 12 and the spectral sensitivity of the photosensitive recording medium 14 are different, the exposure amounts of each of RGB in the display image for exposing the photosensitive recording medium 14 are not optimized, and thus the number of grayscales may decrease.

[0163] Therefore, the control unit 31 of the present embodiment suppresses the reduction of the number of grayscales as described above by optimizing the exposure amount of each of RGB in the display image for exposing the photosensitive recording medium 14. Specifically, the control unit 31 optimizes the split exposure time of each of RGB in the display image for split exposure and displays the display image for split exposure of the R component, the display image for split exposure of the G component, and the display image for split exposure of the B component on the image display device 12 in an arbitrary order to perform split exposure, thereby optimizing the exposure amount of each of RGB.

[0164] (Optimization method for split exposure time)

[0165] Fig. 20 A flowchart showing an example of a process for optimizing the exposure time is shown in FIG. Fig.21 An example of an evaluation system for spectral characteristics (brightness) used in optimizing exposure time is shown in FIG. Fig.21 In the evaluation system shown, a spectroradiometer "SR-3" manufactured by TOPCON TECHNOHOUSE CORPORATION was used as the spectroradiometer 200, and the distance was set to 50 cm and the measurement angle was set to 2 degrees.

[0166] First, as a preprocessing, Fig. 20 In step S200 shown, the luminous peak values ​​of RGB of an ideal image display device are measured. An ideal image display device is an image display device that displays an image having the same hue as the image recorded in the photosensitive recording medium 14. That is, it is an image display device 12 in which the display image is optimized.

[0167] Specifically, a display image for split exposure of the R component, that is, a red (R) image with pixel values ​​of (255, 0, 0), is displayed on an ideal image display device, and Fig.21Similarly, a display image for split exposure of the G component, that is, a green (G) image with a pixel value of (0, 255, 0) is displayed on an ideal image display device, and the peak light emission is measured by the evaluation system shown in FIG. Fig.21 Similarly, a display image for split exposure of the B component, that is, a blue (B) image with pixel values ​​of (0, 0, 255) is displayed on an ideal image display device, and the peak light emission is measured by the evaluation system shown in FIG. Fig.21 The evaluation system shown measures the peak light emission, thereby obtaining the maximum value (maximum light amount) of the optimal brightness of each of red (R), green (G), and blue (B).

[0168] Then, as a post-processing, Fig. 20 In step S202 shown, the luminous peak values ​​of RGB of the current image display device 12 before being assembled to the image exposure device 10 are measured. As an example, in this embodiment, the luminous peak values ​​of RGB in the image display device 12 before the louvered film 16 is set are measured. The measuring method is the same as the above-mentioned step S100, and the image display device 12 is made to display the image of the R component (255, 0, 0), the image of the G component (0, 255, 0) and the image of the B component (0, 0, 255) in sequence, and the luminous peak value in each image is measured by the spectroradiometer 200. In this way, the maximum value (maximum light amount) of the brightness of each of red (R), green (G) and blue (B) in the current image exposure device 10 can be obtained.

[0169] At the end of the exposure time optimization process, as a post-processing, Fig. 20In step S204 shown, the exposure time of the display image for the split exposure of each RGB component is derived. The total amount of light irradiated to the photosensitive recording medium 14 during exposure is the amount obtained by multiplying the amount of light for each RGB by the exposure time (amount of light×exposure time). As an example, in this embodiment, the amount of light measured in the above step S200 and exposed for 100msec at the maximum value of the brightness in the ideal image display device is set as the total amount of light. That is, for each RGB, the value of the maximum value of the brightness (maximum amount of light) measured in the above step S200 multiplied by 100msec is the total amount of light for each RGB. Next, for each RGB, the optimal exposure time for each RGB is obtained by dividing the total amount of light by the maximum value of the brightness (maximum amount of light) in the image display device 12 measured in the above step S202 (total amount of light ÷ maximum amount of light). As an example, in this embodiment, the optimal exposure time for each RGB obtained in this way is pre-stored in the storage unit 46 of the image display device 12. In addition, the exposure time optimized by this exposure time optimization process is the appropriate exposure time. Therefore, the value obtained by dividing the exposure time optimized by the present exposure time optimization process by the number of exposures becomes the optimized divided exposure time.

[0170] In addition, the method of optimizing the exposure time for each RGB is not limited to the above method. For example, when a white image (255, 255, 255) is displayed as a display image on the image exposure device 10 and the photosensitive recording medium 14 is exposed by the display image, the maximum value of the brightness of the display image (display image for split exposure) for obtaining the best recording image can be determined by adjusting the color tone of the display image to the state of the optimized recording image.

[0171] Furthermore, in the present embodiment, for each combination of input values ​​of R, G, and B, chromaticity adjustment of each grayscale is performed using a three-dimensional LUT (LookUp table) that refers to each output value of R, G, and B.

[0172] Thus, in the image exposure device 10 of the present embodiment, the control unit 31 performs split exposure by sequentially exposing RGB at an optimized exposure time, thereby not reducing the number of grayscales of the display image for split exposure and reducing grayscale jumps. Therefore, in the image exposure device 10 of the present embodiment, the display image for split exposure becomes a smooth image. However, by reducing grayscale jumps, the change in chromaticity is reduced, and as a result, the recorded image sometimes becomes a blurred image. For example, Fig. 22 As shown in FIG. 1 , when the exposure time is optimized, the recorded image with increased grayscale, as indicated by the white circle in the graph, is obtained compared to the case where grayscale jump occurs as described above. Fig. 22As shown, in a recorded image in which the exposure time is optimized, the visibility of the edge portion is likely to be reduced and a blurred image is generated.

[0173] Therefore, in the present embodiment, the image generation unit 30 of the image display device 12 performs image processing for pre-increasing (emphasizing) the high-frequency component (edge ​​portion) of the displayed image, taking into account the case where the density difference in the recorded image is smaller than the density difference in the displayed image. In particular, the image generation unit 30 performs image processing for pre-increasing (emphasizing) the high-frequency component (edge ​​portion) of the displayed image, taking into account the case where the image becomes blurred due to the optimization of the exposure time.

[0174] [Exposure Processing]

[0175] Next, the exposure process executed by the image display device 12 of this embodiment will be described. Fig.23 FIG. 2 is a flowchart showing an example of exposure processing performed by the image display device 12 of this embodiment. Fig.23 The exposure process shown in the figure further includes the processes of steps S103A and S103B between steps S102 and S104, which is different from the exposure process of the first embodiment (see Fig.16 )different.

[0176] exist Fig.23 In the exposure process shown in FIG. 1 , in step S103A, the control unit 31 obtains the optimal exposure time of each RGB from the storage unit 46 as described above. In the next step S103B, the control unit 31 derives the divided exposure time for each RGB. Specifically, the control unit 31 derives the divided exposure time for each RGB by dividing the optimal exposure time of each RGB obtained in the above step S103A by the number of exposures.

[0177] Through the processing of step S103B, in the subsequent steps S106 to S108, for example, Fig.24 In the example shown in the timing diagram, the control unit 31 displays a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component respectively according to the optimal exposure time, and performs RGB exposure in sequence and split exposure.

[0178] Thus, according to the image exposure device 10 of the present embodiment, in order to optimize the split exposure time of the display image for split exposure based on each RGB component, as described above, the grayscale jump of the display image for split exposure can be reduced, and the display image for split exposure can be set to a smooth image. Therefore, according to the image exposure device 10 of the present embodiment, the color tone of the recorded image can be set to a desired color tone.

[0179] As described above, the image exposure device 10 of each embodiment includes: the image display device 12 having a plurality of pixels 13; the support unit 21 supporting the photosensitive recording medium 14 recording the image displayed on the image display device 12 so that the exposure surface 14A of the photosensitive recording medium 14 faces the image display device 12; the louver film 16 provided between the image display device 12 and the support unit 21 and limiting the angle of light irradiated from the image display device 12 to the photosensitive recording medium 14; the CPU 40 as at least one processor; and the storage unit 46 storing the exposure processing program 50 executable by the processor. Then, the CPU 40 included in the image display device 12 of the image exposure device 10 displays a display image for split exposure having split grayscale values ​​for splitting the recorded image on the display unit 32 of the image display device 12, and sequentially performs a plurality of exposures of the photosensitive recording medium 14 using the display image for split exposure, thereby performing split exposure for recording the recorded image on the photosensitive recording medium 14.

[0180] The grayscale number of the recorded image recorded on the photosensitive recording medium 14 depends on the maximum grayscale number of the display unit 32 of the image display device 12. Therefore, when split exposure is not performed, the grayscale number of the recorded image becomes the maximum grayscale number of the display unit 32. In contrast, in the image exposure device 10 of each of the above-mentioned embodiments, for example, when the grayscale number of the input image is greater than the maximum grayscale number, or the grayscale number of the desired recorded image is greater than the maximum grayscale number, split exposure is performed using a display image for split exposure having a split grayscale value obtained by dividing the grayscale value of the recorded image by the number of exposures. In this way, in the image exposure device 10 of each of the above-mentioned embodiments, the light amount of light irradiated to the photosensitive recording medium 14 can be finely adjusted by increasing the number of exposures.

[0181] Therefore, according to the image exposure device 10 of each embodiment described above, it is possible to record a recording image having more gradations than the gradation of the display image (display image for split exposure) displayed on the image display device 12 on the photosensitive recording medium 14 .

[0182] Furthermore, according to the image exposure device 10 of each of the above-described embodiments, it is possible to suppress the limitation of the number of grayscales of the recorded image based on the maximum grayscale of the display image (display image for split exposure) displayed on the image display device 12. Furthermore, according to the image exposure device 10 of each of the above-described embodiments, it is possible to use the image display device 12 having the display unit 32 with a relatively small maximum number of grayscales. Therefore, it is possible to easily configure the image display device 12 and, therefore, the image exposure device 10.

[0183] In addition, in the above-mentioned embodiments, the method of sequentially exposing RGB is described, but Fig.25As shown in an example of a timing chart of , a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component can be simultaneously displayed on the display unit 32. That is, a method of performing RGB exposure can be set.

[0184] Furthermore, in the above-mentioned embodiments, the case where the grayscale numbers of the input image and the recorded image are predetermined is described, but the grayscale number of at least one of the input image and the recorded image may not be predetermined and may be variable. In this case, the control unit 31 may obtain the grayscale number that is not predetermined via the input unit 48, etc. In addition, in this case, the control unit 31 derives the number of exposures and the divided exposure time in the split exposure based on the acquired grayscale number.

[0185] Furthermore, in the above-mentioned embodiment, the case where the grayscale number of the recorded image is greater than the maximum grayscale number of the display unit 32 is described, but a mode may be adopted in which a recorded image having a grayscale number less than the maximum grayscale number of the display unit 32 can also be recorded on the photosensitive recording medium 14. In other words, the image exposure device 10 may be set as an exposure device that can record (expose) two types of recorded images, namely, a recorded image having a grayscale number greater than the maximum grayscale number of the display unit 32 and a recorded image having a grayscale number less than the maximum grayscale number of the display unit 32 on the photosensitive recording medium 14. When the image exposure device 10 is set as such an exposure device, when recording a recorded image having a grayscale number less than the maximum grayscale number of the display unit 32 on the photosensitive recording medium 14, a batch exposure with the number of exposures set to one may be performed instead of performing split exposure in which a plurality of exposures are performed.

[0186] Furthermore, in the above-mentioned embodiments, a method of displaying a color image in the image display device 12 is described in which each of the plurality of pixels 13 of the image display device 12 includes sub-pixels 13R, 13G, and 13B, but the structure of the image display device 12 for displaying a color image is not limited to this method. For example, the image display device 12 may also be a method of including light sources or filters corresponding to the R component, the G component, and the B component, respectively.

[0187] In the above-described embodiments, the unsharp mask process is described as the high-frequency component emphasis process performed by the image generating unit 30 . However, this is not limited to the present embodiment, and for example, a convolution process may be applied.

[0188] Furthermore, there is no limitation as long as the limiting member does not limit the structure of the louver film 16 and can limit the angle of light irradiated from the image display device 12. For example, the light-transmitting portion 102 and the light-shielding portion 104 may be arranged non-periodically, or a capillary plate with holes formed randomly may be used as the limiting member.

[0189] Furthermore, in the above-mentioned embodiments, the image display device 12 is described as including the image generation unit 30 and the control unit 31, but the image generation unit 30 and the control unit 31 may be configured as devices different from the image display device 12. For example, the image display device 12 may receive image data subjected to image processing from the smartphone and display an image corresponding to the image data on the display unit 32 by executing the exposure processing program 50 through the CPU of a smartphone or the like, and display an image corresponding to the image data may be displayed on the display unit 32. Furthermore, the image generation unit 30 and the control unit 31 may be included in different devices.

[0190] Furthermore, as the hardware structure of the processing unit (processing unit) that executes various processes such as the image generation unit 30 and the control unit 31 of the image display device 12 in this embodiment, various processors (processors) shown below can be used. The various processors include, in addition to the general-purpose processors, i.e., CPUs, that execute software (programs) as described above to function as various processing units, processors such as FPGA (Field-Programmable Gate Array) that can change the circuit structure after manufacturing, i.e., programmable logic devices (PLDs), ASICs (Application Specific Integrated Circuits), etc., that are processors with circuit structures designed specifically for executing specific processes, i.e., dedicated circuits, etc.

[0191] One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs or a combination of a CPU and an FPGA). Furthermore, multiple processing units may be composed of one processor.

[0192] As an example of a plurality of processing units constituted by one processor, first, as represented by computers such as client terminals and servers, there is the following method: a processor is constituted by a combination of one or more CPUs and software, and the processor functions as a plurality of processing units. Second, as represented by a system on chip (System On Chip: SoC), there is the following method: a processor that realizes the functions of the entire system including a plurality of processing units by using one IC (Integrated Circuit) chip. In this way, various processing units are constituted as a hardware structure using one or more of the above-mentioned various processors.

[0193] Furthermore, as the hardware configuration of these various processors, more specifically, a circuit (circuitry) formed by combining circuit elements such as semiconductor elements can be used.

[0194] In addition, in the present embodiment, the exposure processing program 50 is described as being pre-stored (installed) in the storage unit 46, but the present invention is not limited thereto. The exposure processing program 50 may also be provided in a form recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read 0nly Memory), or a USB (Universal Serial Bus) memory. Furthermore, the exposure processing program 50 may be downloaded from an external device via a network.

[0195] The entire contents of Japanese Patent Application No. 2020-025671 filed on February 18, 2020 are incorporated herein by reference.

[0196] All documents, patent applications, and technical standards described in this specification are incorporated herein by reference to the same extent as if each document, patent application, and technical standard was specifically and individually described as being incorporated by reference.

[0197] Explanation of symbols

[0198] 10-image exposure device, 12-image display device, 13-pixel, 13R, 13G, 13B-sub-pixel, 14-photosensitive recording medium, 14A-exposure surface, 15-point light source, 16-louver film, 16A-plane of louver film, 16B-side of louver film, 17-protective layer, 18-film box, 20-housing, 21-supporting part, 22-exposure opening, 26-glass window, 30-image generating part, 31-control part, 32-display part, 34-receiving part, 40-CPU, 42-memory, 46-storage unit, 48-input unit, 49-bus, 50-exposure processing program, 102-light-transmitting part, 104-light-shielding part, 106-light-shielding component, 117-protective layer, 118-first layer, 118A-plane of the first layer, 119-second layer, 119A-plane of the second layer, 200-spectrometer, E-high frequency component (edge ​​part), H-height, M1~M3-range, P-dot pitch of the light-shielding part, Q-width, t-thickness of the louvered film, T0~T14, TX-time.

Claims

1. An image exposure device, comprising: An image display device having a plurality of pixels; a support portion for supporting the photosensitive recording medium for recording a display image displayed on the image display device by making an exposure surface of the photosensitive recording medium face the image display device; a limiting member disposed between the image display device and the support portion and limiting an angle of light irradiated from the image display device to the photosensitive recording medium; At least 1 processor; and a memory storing instructions executable by the processor, The processor performs the following processing: causing the image display device to display a display image for split exposure having split grayscale values ​​for splitting the grayscale values ​​of the recorded image, The photosensitive recording medium is exposed multiple times in sequence using the display image for split exposure, and split exposure is performed to record the record image on the photosensitive recording medium. The processor also performs the following processing: determining the segmentation grayscale value possessed by the display image for the segmentation exposure used in each exposure in the segmentation exposure, According to the determined segmentation grayscale value, the light amount of the display image for the segmentation exposure is controlled, The difference between the segmentation grayscale value of the display image for the divided exposure used in the n-th exposure in the divided exposure and the segmentation grayscale value of the display image for the divided exposure used in the (n+1)-th exposure is 1 or -1.

2. The image exposure device according to claim 1, wherein: A sum of the divided grayscale values ​​of the display image for the divided exposure used in each exposure in the divided exposure is larger than a maximum grayscale number which is a maximum value of a grayscale number displayable on the image display device.

3. The image exposure device according to claim 2, wherein: The sum of the segmented grayscale values ​​is the same as the grayscale value of the recorded image.

4. The image exposure device according to claim 1, wherein: The number of exposures in the divided exposure is an integer rounded to the first decimal place of a value obtained by dividing the grayscale number of the recorded image by the maximum grayscale number.

5. The image exposure device according to claim 1, wherein: The exposure time of each of the divided exposures is the same.

6. The image exposure device according to claim 5, wherein: The exposure time for each of the divided exposures is obtained by dividing the exposure time for recording the recording image with the maximum number of grayscales on the photosensitive recording medium using the display image with the maximum number of grayscales by the number of exposures.

7. The image exposure device according to claim 1, wherein: inputting image data of an input image having the same grayscale value as that of the recorded image, The processor generates a display image for the divided exposure from the input image.

8. The image exposure device according to claim 1, wherein: The processor performs the following processing: generating a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component from a color input image represented by the input image data, The display image for the split exposure of the R component, the display image for the split exposure of the G component, and the display image for the split exposure of the B component are sequentially displayed on the image display device in a predetermined order, and the split exposure is performed for each color of RGB.

9. The image exposure device according to claim 8, wherein: The total amount of light used to expose the photosensitive recording medium is specified for each color of RGB, The processor sequentially exposes the photosensitive recording medium using a display image for split exposure of the R component, a display image for split exposure of the G component, and a display image for split exposure of the B component, with an exposure time corresponding to the maximum light amount of each RGB color displayed in the image display device and the total light amount, and performs the split exposure on each RGB color.

10. The image exposure device according to claim 1, wherein: The processor generates the display image for the divided exposure in which the image quality of the input image is degraded by emphasizing the density difference of the high-frequency component of the input image represented by the input image data.

11. The image exposure apparatus according to any one of claims 1 to 10, wherein: The limiting component is an optical component of a diffusion optical system.

12. An image exposure method, which is an image exposure method using an image exposure device, wherein the image exposure device comprises: An image display device having a plurality of pixels; a support portion supporting a photosensitive recording medium recording a display image displayed in the image display device so that an exposure surface of the photosensitive recording medium faces the image display device; and a limiting member disposed between the image display device and the support portion and limiting an angle of light irradiated from the image display device to the photosensitive recording medium, wherein the image exposure method comprises: causing the image display device to display a display image for split exposure having split grayscale values ​​for splitting the grayscale values ​​of the recorded image, The photosensitive recording medium is exposed multiple times in sequence using the display image for split exposure, and split exposure is performed to record the record image on the photosensitive recording medium. determining the segmentation grayscale value possessed by the display image for the segmentation exposure used in each exposure in the segmentation exposure, According to the determined segmentation grayscale value, the light amount of the display image for the segmentation exposure is controlled, The difference between the segmentation grayscale value of the display image for the divided exposure used in the n-th exposure in the divided exposure and the segmentation grayscale value of the display image for the divided exposure used in the (n+1)-th exposure is 1 or -1.

13. A computer-readable recording medium having a program recorded thereon, the program causing a computer to execute the following processing on an image exposure device: causing an image display device to display a display image for split exposure having split grayscale values ​​for splitting the grayscale values ​​of the recorded image, The photosensitive recording medium is exposed multiple times in sequence using the display image for split exposure, and split exposure is performed to record the record image on the photosensitive recording medium. in, The image exposure device comprises: an image display device having a plurality of pixels; a support portion that supports the photosensitive recording medium that records the display image displayed in the image display device so that the exposure surface of the photosensitive recording medium faces the image display device; and a limiting member that is disposed between the image display device and the support portion and limits the angle of light irradiated from the image display device to the photosensitive recording medium. The program also causes the computer to execute the following processing on the image exposure device: determining the segmentation grayscale value possessed by the display image for the segmentation exposure used in each exposure in the segmentation exposure, According to the determined segmentation grayscale value, the light amount of the display image for the segmentation exposure is controlled, The difference between the segmentation grayscale value of the display image for the divided exposure used in the n-th exposure in the divided exposure and the segmentation grayscale value of the display image for the divided exposure used in the (n+1)-th exposure is 1 or -1.

Images