Image processing device, imaging device, evaluation device, image processing method, and optical system evaluation method
First Claim
1. An image processing device which corrects an image with a degraded image quality due to unnecessary diffracted light generated in an optical system including a diffractive optical element, said image processing device comprising:
- an evaluation area setting unit configured to detect a saturated pixel having a saturated luminance value, from among pixels included in the image and to set an area in the image including the detected saturated pixel as an evaluation area;
a pixel count calculating unit configured to calculate a pixel count for each of luminance values of pixels included in the set evaluation area;
a first luminance value determining unit configured to determine a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value;
a second luminance value determining unit configured to determine a second luminance value which is a luminance value corresponding to a background of the image; and
a correction unit configured to correct a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area so as to lower the luminance of the pixel.
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Accused Products
Abstract
An image processing device that can highly precisely correct an image with a degraded image quality due to the unnecessary diffracted light generated in the optical system including the diffractive optical element is provided. The image processing device includes an evaluation area setting unit (111) which detects a saturated pixel having a saturated luminance value, from among pixels included in the image and to set an area in the image including the detected saturated pixel as an evaluation area, a pixel count calculating unit (112) which calculates a pixel count for each of luminance values of pixels included in the set evaluation area, a first luminance value determining unit (113) which determines a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value, a second luminance value determining unit (114) which determines a second luminance value which is a luminance value corresponding to a background of the image, and a correction unit (116) which corrects a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area so as to lower the luminance of the pixel.
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Citations
20 Claims
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1. An image processing device which corrects an image with a degraded image quality due to unnecessary diffracted light generated in an optical system including a diffractive optical element, said image processing device comprising:
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an evaluation area setting unit configured to detect a saturated pixel having a saturated luminance value, from among pixels included in the image and to set an area in the image including the detected saturated pixel as an evaluation area; a pixel count calculating unit configured to calculate a pixel count for each of luminance values of pixels included in the set evaluation area; a first luminance value determining unit configured to determine a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value; a second luminance value determining unit configured to determine a second luminance value which is a luminance value corresponding to a background of the image; and a correction unit configured to correct a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area so as to lower the luminance of the pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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13. An image processing method for correcting an image with a degraded image quality due to unnecessary diffracted light generated in an optical system including a diffractive optical element, said image processing method comprising:
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detecting a saturated pixel having a saturated luminance value, from among pixels included in the image and setting an area in the image including the detected saturated pixel as an evaluation area; calculating a pixel count for each of luminance values of pixels included in the set evaluation area; determining a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value; determining a second luminance value which is a luminance value corresponding to a background of the image; and correcting a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area so as to lower the luminance of the pixel.
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14. A non-transitory computer readable medium containing a program for correcting an image with a degraded image quality due to unnecessary diffracted light generated in an optical system including a diffractive optical element, said program causing the computer to execute:
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detecting a saturated pixel having a saturated luminance value, from among pixels included in the image and setting an area in the image including the detected saturated pixel as an evaluation area; calculating a pixel count for each of luminance values of pixels included in the set evaluation area; determining a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value; determining a second luminance value which is a luminance value corresponding to a background of the image; and correcting a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area so as to lower the luminance of the pixel.
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16. An evaluation apparatus which evaluates capability, regarding unnecessary diffracted light, of an optical system including a diffractive optical element, said evaluation apparatus comprising:
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a light source arranged at a predetermined distance from the optical system; an imaging system which captures light which is from said light source and is transmitted said optical system; an evaluation area determining unit configured to detect a saturated pixel having a saturated luminance value, from among pixels included in the image and to set an area in the image including the detected saturated pixel as an evaluation area; a pixel count calculating unit configured to calculate a pixel count for each of luminance values of pixels included in the set evaluation area; a first luminance value determining unit configured to determine a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value; a second luminance value determining unit configured to determine a second luminance value which is a luminance value corresponding to a background of the image; and an evaluation unit configured to evaluate the capability of the optical system regarding the unnecessary diffracted light, using a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area. - View Dependent Claims (17, 18)
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19. An evaluation method for an evaluation apparatus which evaluates capability, regarding unnecessary diffracted light, of an optical system including a diffractive optical element,
wherein the evaluation apparatus includes: -
a light source arranged at a predetermined distance from the optical system; and an imaging system which captures light which is from said light source and is transmitted said optical system, and said evaluation method comprising; detecting a saturated pixel having a saturated luminance value, from among pixels included in the image and setting an area in the image including the detected saturated pixel as an evaluation area; calculating a pixel count for each of luminance values of pixels included in the set evaluation area; determining a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value; determining a second luminance value which is a luminance value corresponding to a background of the image; and evaluating the capability of the optical system regarding the unnecessary diffracted light, using a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area.
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20. A non-transitory computer readable medium containing a program for an evaluation apparatus which evaluates capability, regarding unnecessary diffracted light, of an optical system including a diffractive optical element,
wherein the evaluation apparatus includes: -
a light source arranged at a predetermined distance from the optical system; and an imaging system which captures light which is from said light source and is transmitted said optical system, and said program causing the computer to execute; detecting a saturated pixel having a saturated luminance value, from among pixels included in the image and setting an area in the image including the detected saturated pixel as an evaluation area; calculating a pixel count for each of luminance values of pixels included in the set evaluation area; determining a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value; determining a second luminance value which is a luminance value corresponding to a background of the image; and evaluating the capability of the optical system regarding the unnecessary diffracted light, using a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area.
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Specification