Image determining apparatus, image determining method, image enhancing apparatus, and image enhancing method
First Claim
1. An image determining apparatus comprising:
- (A) a histogram data generation section that, based on data of pixels constituting an image to be determined, generates data of histograms for each color, the histograms representing a distribution of the number of pixels with respect to density values of each color of those pixels;
(B) an attribute information obtaining section that obtains, for each color, attribute information relating to a first small region and a second small region by partitioning regions represented by the histograms for each color into at least two small regions each, according to the magnitude of the density values, based on the data of the histograms for each color generated by the histogram data generation section, selecting, for each color, as the first small region, a small region whose density values are larger than those of at least one other of the at least two small regions, and selecting, as the second small region, for each color, another small region whose density values are smaller than those of the first small region; and
(C) a determining section that determines whether the image to be determined is an image in which the color balance of the first small region is destroyed, based on the attribute information relating to the first small region for each color and the attribute information relating to the second small region for each color, that have been obtained by the attribute information obtaining section.
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Abstract
An image determining apparatus according to the present invention includes: (A) a histogram data generation section that, based on data of pixels constituting an image to be determined, generates data of histograms for each color, the histograms representing a distribution of the number of pixels with respect to density values of each color of those pixels; (B) an attribute information obtaining section that obtains, for each color, attribute information relating to a first small region and a second small region by partitioning regions represented by the histograms for each color into at least three small regions each, according to the magnitude of the density values, based on the data of the histograms for each color generated by the histogram data generation section, selecting, for each color, as the first small region, a small region whose density values are larger than those of at least one other of the at least three small regions and whose density values are smaller than those of at least yet one other of the at least three small regions, and selecting, for each color, at least one small region other than the first small region as a second small region; and (C) a determining section that determines whether the image to be determined is an image in which the color balance of the first small region is destroyed, based on the attribute information relating to the first small region for each color and the attribute information relating to the second small region for each color, that have been obtained by the attribute information obtaining section.
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Citations
18 Claims
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1. An image determining apparatus comprising:
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(A) a histogram data generation section that, based on data of pixels constituting an image to be determined, generates data of histograms for each color, the histograms representing a distribution of the number of pixels with respect to density values of each color of those pixels;
(B) an attribute information obtaining section that obtains, for each color, attribute information relating to a first small region and a second small region by partitioning regions represented by the histograms for each color into at least two small regions each, according to the magnitude of the density values, based on the data of the histograms for each color generated by the histogram data generation section, selecting, for each color, as the first small region, a small region whose density values are larger than those of at least one other of the at least two small regions, and selecting, as the second small region, for each color, another small region whose density values are smaller than those of the first small region; and
(C) a determining section that determines whether the image to be determined is an image in which the color balance of the first small region is destroyed, based on the attribute information relating to the first small region for each color and the attribute information relating to the second small region for each color, that have been obtained by the attribute information obtaining section. - View Dependent Claims (2, 3, 4, 5)
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6. An image enhancement apparatus comprising:
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(A) a histogram data generation section that, based on data of pixels constituting an image, generates data of histograms for each color, the histograms representing a distribution of the number of pixels with respect to density values of each color of those pixels;
(B) an attribute information obtaining section that obtains, for each color, attribute information relating to a small region by partitioning regions represented by the histograms for each color into at least three small regions according to the magnitude of the density values, based on the data of the histograms for each color generated by the histogram data generation section, and selecting, for each color, at least one small region of the at least three small regions;
(C) a target value obtaining section that obtains a target value for each color of the attribute information relating to the first small region and a target value that is common for all colors of the attribute information relating to the second small region, based on the attribute information obtained by the attribute information obtaining section by selecting, as the first small region, for each color, at least one small region whose density values are smaller than those of at least one other small region, of the at least three small regions, and selecting of the at least three small regions, as the second small region, at least one small region whose density values are smaller than those of the first small region; and
(D) an enhancement processing section that subjects the image to an enhancement process, such that the attribute information of each color of the first small region each becomes the target value for each color, that has been obtained by the target value obtaining section, and such that the attribute information of each color of the second small region each becomes the target value, which is common for all colors, that has been obtained by the target value obtaining section. - View Dependent Claims (7, 8, 9, 10)
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11. A backlight image enhancement apparatus comprising:
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(A) a first determining section that determines whether an image is a backlight image;
(B) a second determining section that determines whether the image is an image in which the color balance of intermediate tones is destroyed, if it has been determined that the image is a backlight image by the first determining section;
(C) a third determining section that determines whether the image is an image of a sunset or a sunrise, if it has been determined that the image is not an image in which the color balance of intermediate tones is destroyed by the second determining section; and
(D) an enhancement processing section that subjects the image to an enhancement process according to a determination result, based on the determination result of the first determining section, the second determining section or the third determining section. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A backlight image enhancement method comprising:
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(A) a first step of determining whether an image is a backlight image;
(B) a second step of determining whether the image is an image in which the color balance of intermediate tones is destroyed, if it has been determined that the image is a backlight image;
(C) a third step of determining whether the image is an image of a sunset or a sunrise, when it has been determined that the image is not an image in which the color balance of intermediate tones is destroyed; and
(D) a fourth step of subjecting the image to an enhancement process according to a determination result of the first step, the second step or the third step.
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Specification