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EP-4206819-B1 - IMAGE EXPOSURE DEVICE, IMAGE EXPOSURE METHOD, AND PROGRAM

EP4206819B1EP 4206819 B1EP4206819 B1EP 4206819B1EP-4206819-B1

Inventors

  • YOSHIZAWA, Hirotoshi
  • SONODA, SHINICHIRO

Dates

Publication Date
20260506
Application Date
20210721

Claims (14)

  1. An image exposure device (2) comprising: an image display device (3) that has a plurality of pixels (30) and irradiates a photosensitive recording medium (7) with light from the plurality of pixels; a support member (4) that supports the photosensitive recording medium in a state in which an exposure surface (7A) of the photosensitive recording medium faces the image display device; a limiting member (5) 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 (60), characterised in that : the processor controls the image display device to display a display image generated by emphasizing only a dark portion among density differences of high-frequency components of an input image.
  2. The image exposure device according to claim 1, wherein the processor generates 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 or 2, wherein the processor emphasizes the density differences of the high-frequency components extracted from the input image by unsharp mask processing.
  4. The image exposure device according to any one of claims 1 to 3, wherein, in a case where a resolution (unit: ppi) of the image display device is D, the processor sets 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).
  5. The image exposure device according to claim 4, wherein the processor sets 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.
  6. The image exposure device according to any one of claims 1 to 5, wherein the limiting member is an optical member of a diffusion optical system.
  7. The image exposure device according to claim 6, 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.
  8. The image exposure device according to claim 6, 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.
  9. The image exposure device according to claim 7 or 8, 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.
  10. The image exposure device according to any one of claims 7 to 9, 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.
  11. The image exposure device according to any one of claims 1 to 10, wherein the limiting member is disposed at a position separated by a certain distance from the photosensitive recording medium.
  12. The image exposure device according to claim 11, wherein the certain distance is 0.67 mm or less.
  13. An image exposure method in an image exposure device (2) including an image display device (3) that has a plurality of pixels (30) and irradiates a photosensitive recording medium (7) with light from the plurality of pixels, a support member (4) that supports the photosensitive recording medium in a state in which an exposure surface (7A) of the photosensitive recording medium faces the image display device, and a limiting member (5) 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, the image exposure method characterised by : controlling the image display device to display a display image generated by emphasizing only a dark portion among density differences of high-frequency components of an input image.
  14. A computer-readable storage medium storing a program for causing a computer to execute a process, the computer controlling an image exposure device (2) including an image display device (3) that has a plurality of pixels (30) and irradiates a photosensitive recording medium (7) with light from the plurality of pixels, a support member (4) that supports the photosensitive recording medium in a state in which an exposure surface /7A) of the photosensitive recording medium faces the image display device, and a limiting member (5) 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, the process characterised by : controlling the image display device to display a display image generated by emphasizing only a dark portion among density differences of high-frequency components of an input image.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The technology of the present disclosure relates to an image exposure device, an image exposure method, and a program. 2. Description of the Related Art An image exposure device that exposes a photosensitive recording medium (for example, an instant film) to light emitted from an image display device is known. A display image displayed on the image exposure device is recorded on the photosensitive recording medium. This image exposure device is used for an instant camera or the like. Further, in order to suppress blurring of a recorded image recorded on a photosensitive recording medium, it is known to provide a limiting member between the image display device and the photosensitive recording medium to limit the angle of light emitted from the image display device to the photosensitive recording medium. The limiting member suppresses diffused light from the light emitted from the image display device to the photosensitive recording medium. However, depending on the structure of the limiting member, the light emitted from the limiting member may be diffused. In this case, in the recorded image recorded on the photosensitive recording medium, the density difference in the edge portion (for example, the contour of the subject) becomes small, resulting in deterioration of visibility. That is, blurring occurs in the recorded image. WO2019/187751A, which is considered to be the closest prior art and describes aspects according to the preamble of the independent claims, proposes emphasizing density differences of the high-frequency components of the display image in order to suppress the blurring of the recorded image caused by the diffusion of the light emitted from the limiting member. SUMMARY OF THE INVENTION In the technology described in WO2019/187751A, in a case of emphasizing the density differences of high-frequency components of a display image, the bright portion and the dark portion are emphasized with the same weight. In a case where the density differences of the high-frequency components of the display image are emphasized in this way, the effect of suppressing the blurring of the recorded image can be obtained as compared with the case where the limiting member is simply provided. In the case of using the technology described in WO2019/187751A, the brightness and darkness of the recorded image are emphasized by increasing the degree of emphasis of the density differences of the high-frequency components. However, the applicant has confirmed that, in a case where the degree of emphasis is increased above a certain level, the emphasized bright portion of the display image sometimes cancels the effect of emphasizing the brightness and darkness of the recorded image. Therefore, in a case where the degree of emphasis is increased above a certain level, the sense of resolution of the recorded image may not be improved. An object of the technology of the present disclosure is to provide an image exposure device, an image exposure method, and a program that enable improvement in the sense of resolution of a recorded image. In order to achieve the above object, according to an aspect of the present disclosure, there is provided 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, in which the processor controls the image display device to display a display image generated by emphasizing only a dark portion among density differences of high-frequency components of an input image. It is preferable that the processor generates 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. It is preferable that the processor emphasizes the density differences of the high-frequency components extracted from the input image by unsharp mask processing. It is preferable that, in a case where a resolution (unit: ppi) of the image display device is D, the processor sets 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). It is preferable that the processor sets 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 th