Method and system for compressing digital images
First Claim
1. A method for compressing a color image wherein a color map having at least two axes, is used for determining colors of the image, the method comprising the steps of:
- a) defining an active color area within said color map, wherein all colors present within the color image are confined within the active color area;
b) forming a coordinate system for the active color area, and c) mapping the colors of the images to indices of said coordinate system.
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Abstract
This invention relates to techniques for compressing images, particularly color images. The invention forms a lightly decodable compression technique for the color information in digital color images and video. The invention is based on an idea that an active color area in a color map is defined. The active area comprises all colors of the image under compression. Further a coordinate system is formed for the active area. The colors in the active area can be quantized using a grid, wherein each node of the grid represents a color. Since the active area is smaller than the total color map area, fewer bits are needed to index the active colors in the active area. Saving the bits increases the compression of colors when compressing the image. The color values of the image are mapped using the indices of the active color area.
20 Citations
42 Claims
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1. A method for compressing a color image wherein a color map having at least two axes, is used for determining colors of the image, the method comprising the steps of:
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a) defining an active color area within said color map, wherein all colors present within the color image are confined within the active color area;
b) forming a coordinate system for the active color area, and c) mapping the colors of the images to indices of said coordinate system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 41)
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26. A system for compressing a color image wherein a color map is used for determining colors of the image, wherein the arrangement comprises:
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p) an active area locator, constructed to define an active color area within the color map, wherein lie all colors of the image, q) a coordinate system generator constructed to form a coordinate system for the active color area, and r) a mapper adapted to map the colors of the images to indices of the coordinate system. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 42)
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Specification