Black and white stretching system and method for improving contrast of a picture
First Claim
1. A black and white stretching system comprising:
- a histogram distribution calculation unit for calculating a histogram distribution of an input signal of a specified unit;
a mean calculation unit for calculating a mean level of the input image signal;
a slope calculation unit for calculating black and white stretching slopes in association with the mean level;
a ratio calculation unit for calculating a ratio of a picture change on the basis of the histogram distribution of the present input image signal and a previous input image signal;
a filtering unit for adjusting the black and white stretching slopes corresponding to the ratio of the picture change; and
a stretching unit for stretching the input image signal by mapping the adjusted black and white stretching slopes and the input image signal.
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Accused Products
Abstract
A black and white stretching system and method for improving contrast of a picture is disclosed. The system includes a histogram distribution calculation unit for calculating a histogram distribution of an input signal of a specified unit, a mean calculation unit for calculating a mean level of the input image signal, a slope calculation unit for calculating black and white stretching slopes in association with the mean level, a ratio calculation unit for calculating a ratio of a picture change based on the histogram distribution of the present input image signal and the previous input image signal, a filtering unit for adjusting the black and white stretching slopes corresponding to the ratio of the picture change, and a stretching unit for stretching the input image signal by mapping the adjusted black and white stretching slopes and the input image signal.
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Citations
18 Claims
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1. A black and white stretching system comprising:
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a histogram distribution calculation unit for calculating a histogram distribution of an input signal of a specified unit; a mean calculation unit for calculating a mean level of the input image signal; a slope calculation unit for calculating black and white stretching slopes in association with the mean level; a ratio calculation unit for calculating a ratio of a picture change on the basis of the histogram distribution of the present input image signal and a previous input image signal; a filtering unit for adjusting the black and white stretching slopes corresponding to the ratio of the picture change; and a stretching unit for stretching the input image signal by mapping the adjusted black and white stretching slopes and the input image signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A black and white stretching method comprising:
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a histogram distribution calculation step of calculating a histogram distribution of an input signal of a specified unit; a mean calculation step of calculating a mean level of the input image signal; a slope calculation step of calculating black and white stretching slopes in association with the mean level; a ratio calculation step of calculating a ratio of a picture change on the basis of the histogram distribution of the present input image signal and a previous input image signal; a filtering step of adjusting the black and white stretching slopes corresponding to the ratio of the picture change; and a stretching step of stretching the input image signal by mapping the adjusted black and white stretching slopes and the input image signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification