Background suppression method and apparatus
First Claim
Patent Images
1. A method comprising:
- receiving an original image in a red-green-blue color space;
converting pixels in the original image to a luminance-chrominance color space;
determining background pixels in the original image including;
comparing a luminance value of each pixel to a selectable, adjustable luminance threshold value, and comparing chrominance value of each pixel to a predetermined chrominance threshold value; and
adjusting chrominance values of the determined background pixels in each chrominance channel.
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Abstract
An original image is received in a red-green-blue color space. Pixels in the original image are converted to a luminance-chrominance color space. Background pixels in the original image are determined by comparing a luminance value of each pixel to a selectable luminance threshold, and comparing chrominance value of each pixel to a predetermined chrominance threshold. Chrominance values of the background pixels in each chrominance channel are adjusted.
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Citations
20 Claims
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1. A method comprising:
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receiving an original image in a red-green-blue color space;
converting pixels in the original image to a luminance-chrominance color space;
determining background pixels in the original image including;
comparing a luminance value of each pixel to a selectable, adjustable luminance threshold value, and comparing chrominance value of each pixel to a predetermined chrominance threshold value; and
adjusting chrominance values of the determined background pixels in each chrominance channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A document processing system comprising:
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a device for producing red-green-blue color pixel representation of an original image;
a red-green-blue color space to luminance-chrominance color space converter for converting values of red-green-blue pixels into corresponding luminance-chrominance pixel values;
a white pixel determining processor or algorithm for determining background pixels in the original image by comparing a luminance value of each pixel to a selectable, adjustable luminance threshold value, and comparing chrominance value of each pixel to a predetermined chrominance threshold value; and
a chrominance values adjusting processor or algorithm for adjusting chrominance values of each determined background pixel in each chrominance channel. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method comprising:
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receiving an original image in a red-green-blue color space;
converting pixels in the original image to a luminance-chrominance color space;
determining background pixels in the original image including;
comparing a luminance value of each pixel to a luminance threshold, and comparing chrominance values of each pixel to a predetermined chrominance threshold; and
adjusting chrominance values of the determined background pixels in each chrominance channel in accordance with a prespecified chrominance adjustment table. - View Dependent Claims (20)
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Specification