System and method for dynamically enhanced color space
First Claim
Patent Images
1. A method for enhancing contrast in a plurality of images in a video sequence by mapping an input intensity value to an output intensity value in accordance with a mapping function, the method comprising the steps of:
- (a) determining a mean intensity value of the image;
(b) calculating the mapping function including left, right, middle, and principal range, the principal range being contained within the middle range;
(c) applying the mapping function to the input intensity value for determining said output intensity responsive to determining the modality;
(d) determining that the image is likely unimodal if a percentage of image pixels that lie in the principal range is above a first predefined threshold; and
(e) determining that the image is likely bimodal if the percentage of image pixels that lie in the principal range is below a second predefined threshold;
(f) dynamically generating the mapping function for each image in the video sequence.
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Abstract
Contrast in an image is enhanced by mapping an input intensity value to an output intensity value in accordance with a mapping function. A mean intensity value of the image is determined. Co-ordinates of the mapping function are calculated in accordance with the mean intensity value and a plurality of predefined parameters. The mapping function is applied to the input intensity value for determining the output intensity, wherein the mapping function is generated dynamically for each image.
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Citations
23 Claims
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1. A method for enhancing contrast in a plurality of images in a video sequence by mapping an input intensity value to an output intensity value in accordance with a mapping function, the method comprising the steps of:
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(a) determining a mean intensity value of the image; (b) calculating the mapping function including left, right, middle, and principal range, the principal range being contained within the middle range; (c) applying the mapping function to the input intensity value for determining said output intensity responsive to determining the modality; (d) determining that the image is likely unimodal if a percentage of image pixels that lie in the principal range is above a first predefined threshold; and (e) determining that the image is likely bimodal if the percentage of image pixels that lie in the principal range is below a second predefined threshold; (f) dynamically generating the mapping function for each image in the video sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for enhancing contrast in a plurality of images in a video sequence by mapping an input intensity value to an output intensity value in accordance with a mapping function, the system comprising:
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histogram hardware comprising a plurality of counters, comparators, and control logic to generate a histogram and to calculate a mean intensity value responsive to the histogram; and a processor to calculate left, right, middle, and principal ranges of the mapping function in accordance with the mean intensity value and a plurality of predefined parameters, to determine a modality of each image responsive to the principal range, and to apply the mapping function to the input intensity value to determine the output intensity responsive to the modality; where the principal range is contained within the middle range; and wherein the mapping function is generated dynamically for each image in the video sequence; where the processor is adapted to determine that the image is likely unimodal if a percentage of image pixels that lie in the principal range is above a first predefined threshold; where the processor is adapted to determine that the image is likely bimodal if the percentage of image pixels that lie in the principal range is below a second predefined threshold. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification