Image exposure device, image exposure method, and program

1 . An image exposure device comprising:

an image display device that has a plurality of pixels and irradiates a photosensitive recording medium with light from the plurality of pixels;

a support member that supports the photosensitive recording medium in a state in which an exposure surface of the photosensitive recording medium faces the image display device;

a limiting member that is provided between the image display device and the support member and limits an angle of the light emitted from the image display device to the photosensitive recording medium; and

a processor,

wherein the processor is configured to control the image display device to display a display image generated by emphasizing a dark portion among density differences of high-frequency components of an input image, and

wherein in a case where a resolution (unit: ppi) of the image display device is D, the processor is configured to set a range for emphasizing the dark portion to a range according to a value M (unit: the number of pixels) obtained by a relational expression M=30/(2.54×1000/D).

2 . The image exposure device according to claim 1 , wherein

the processor is configured to generate the display image by emphasizing a bright portion in addition to the dark portion among the density differences of the high-frequency components of the input image, and

a degree of emphasis of the dark portion is higher than a degree of emphasis of the bright portion.

3 . The image exposure device according to claim 1 , wherein the processor is configured to emphasize the density differences of the high-frequency components extracted from the input image by unsharp mask processing.

4 . The image exposure device according to claim 1 , wherein the processor is configured to set a standard deviation of a Gaussian filter to the value M or less, and extracts the high-frequency component by performing unsharp mask processing using the Gaussian filter from the input image.

5 . The image exposure device according to claim 1 , wherein the limiting member is an optical member of a diffusion optical system.

6 . The image exposure device according to claim 5 , wherein the optical member is a louver film in which first light transmission parts that transmit light and first light shielding parts that block light are alternately disposed in a first direction on a surface parallel to an arrangement surface where the pixels of the image display device are arranged, and second light transmission parts that transmit light and second light shielding parts that block light are alternately disposed in a second direction on the surface, the second direction being not parallel to the first direction.

7 . The image exposure device according to claim 5 , wherein the optical member is a louver film in which first light transmission parts that transmit light and first light shielding parts that block light are alternately disposed in a first direction on a surface parallel to an arrangement surface where the pixels of the image display device are arranged, and second light transmission parts that transmit light and second light shielding parts that block light are alternately disposed in a second direction on the surface, the second direction being perpendicular to the first direction.

8 . The image exposure device according to claim 6 , wherein the louver film is formed by laminating a first layer in which the first light transmission parts and the first light shielding parts are alternately disposed only in the first direction, and a second layer in which the second light transmission parts and the second light shielding parts are alternately disposed only in the second direction.

9 . The image exposure device according to claim 6 , wherein

the louver film has a thickness of 2.0 mm or more and 4.0 mm or less, and

an arrangement pitch of the first light shielding parts and the second light shielding parts is 80 μm or less.

10 . The image exposure device according to claim 1 , wherein the limiting member is disposed at a position separated by a certain distance from the photosensitive recording medium.

11 . The image exposure device according to claim 10 , wherein the certain distance is 0.67 mm or less.

12 . An image exposure method in an image exposure device, the method comprising:

providing the image exposure device which includes:

an image display device that has a plurality of pixels and irradiates a photosensitive recording medium with light from the plurality of pixels,

a support member that supports the photosensitive recording medium in a state in which an exposure surface of the photosensitive recording medium faces the image display device,

a limiting member that is provided between the image display device and the support member and limits an angle of the light emitted from the image display device to the photosensitive recording medium, and

a processor; and

controlling, by the processor, the image display device to display a display image generated by emphasizing a dark portion among density differences of high-frequency components of an input image,

wherein in a case where a resolution (unit: ppi) of the image display device is D, the processor is configured to set a range for emphasizing the dark portion to a range according to a value M (unit: the number of pixels) obtained by a relational expression M=30/(2.54×1000/D).

13 . A non-transitory computer-readable storage medium storing a program for causing a computer having a processor to execute a process of an image exposure in an image exposure device which includes:

an image display device that has a plurality of pixels and irradiates a photosensitive recording medium with light from the plurality of pixels;

a support member that supports the photosensitive recording medium in a state in which an exposure surface of the photosensitive recording medium faces the image display device;

a limiting member that is provided between the image display device and the support member and limits an angle of the light emitted from the image display device to the photosensitive recording medium; and

the processor, and the process includes:

controlling, by the processor, the image display device to display a display image generated by emphasizing a dark portion among density differences of high-frequency components of an input image,

wherein in a case where a resolution (unit: ppi) of the image display device is D, the processor is configured to set a range for emphasizing the dark portion to a range according to a value M (unit: the number of pixels) obtained by a relational expression M=30/(2.54×1000/D).