Digital image photographing apparatus and method
First Claim
1. A digital image photographing apparatus comprising:
- a histogram calculating part for calculating a histogram of an inputted original image;
a histogram value setting part for selecting an upper range in a first ratio in the histogram to set a lowest limit value as a maximum brightness value of the original image, and selecting a lower range in a second ratio to set a highest limit value as a minimum brightness value of the original image;
a parameter setting part for setting a minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image; and
a histogram stretching part for stretching the histogram of the original image with reference to the maximum and minimum values of the processed image.
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Accused Products
Abstract
A digital image photographing apparatus includes: a histogram calculating part for calculating a histogram of an inputted original image; a histogram value setting part for selecting an upper range in a first ratio in the histogram to set a lowest limit value as a maximum brightness value of the original image, and selecting a lower range in a second ratio to set a highest limit value as a minimum brightness value of the original image; a parameter setting part for setting a minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image; and a histogram stretching part for stretching the histogram of the original image with reference to the maximum and minimum values of the processed image.
29 Citations
19 Claims
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1. A digital image photographing apparatus comprising:
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a histogram calculating part for calculating a histogram of an inputted original image;
a histogram value setting part for selecting an upper range in a first ratio in the histogram to set a lowest limit value as a maximum brightness value of the original image, and selecting a lower range in a second ratio to set a highest limit value as a minimum brightness value of the original image;
a parameter setting part for setting a minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image; and
a histogram stretching part for stretching the histogram of the original image with reference to the maximum and minimum values of the processed image. - View Dependent Claims (2, 3)
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4. A digital image photographing apparatus comprising:
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a histogram calculating part for calculating a histogram of an inputted original image;
a histogram value setting part for setting maximum and minimum brightness values of the original image in the histogram;
a first parameter setting part for setting a first minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a first maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image;
a second parameter setting part for setting second maximum and minimum brightness values according to difference between the maximum and minimum brightness values of the original image; and
a histogram stretching part for stretching the histogram of the original image with reference to the second maximum and minimum brightness values of the processed image. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A digital image photographing apparatus comprising:
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a histogram calculating part for calculating a histogram of an inputted original image;
a histogram value setting part for setting maximum and minimum brightness values of the original image in the histogram;
a first parameter setting part for setting a first minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a first maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image;
a second parameter setting part for setting second maximum and minimum brightness values according to a difference between the maximum and minimum brightness values of the original image;
a third parameter setting part for setting third maximum and minimum brightness values according to a brightness of the second maximum and minimum brightness values; and
a histogram stretching part for stretching the histogram of the original image with reference to the third maximum and minimum brightness values of the processed image. - View Dependent Claims (11, 12, 13)
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14. A digital image photographing method comprising:
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calculating a histogram of an inputted original image;
setting maximum and minimum brightness values of the original image;
setting a first minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a first maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image;
setting second maximum and minimum brightness values according to a difference between the maximum and minimum brightness values of the original image;
setting third maximum and minimum brightness values according to a brightness of the second maximum and minimum brightness values; and
stretching the histogram of the original image with reference to the third maximum and minimum brightness values of the processed image. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification