Image analysis – Color image processing – Compression of color images
Patent
1998-09-24
2000-07-18
Couso, Jose L.
Image analysis
Color image processing
Compression of color images
382232, 345202, G06K 936, G09G 500
Patent
active
060918500
ABSTRACT:
A method of compressing and decompressing graphics images. The compression method operates on uncompressed bitmap image data to generate a compressed representation of the image. To compress an image, all 8 pixel by 8 pixel blocks of the image are individually processed in sequence. For each block, all distinct colors present in the block are identified and assigned an ordinal number. Two pixel colors are deemed distinct if the difference between the colors is greater than an epsilon value. The epsilon value is a function of the total brightness of the block. A data structure for the block is generated to store the number of distinct colors present in the block, the actual RGBA quadruplet for each distinct color, and a color ordinal number of each pixel in the block representing the distinct color of the pixel. To decompress the image, the RGBA quadruplets of all pixels within each block are reconstructed from the data structure for the block.
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Couso Jose L.
Dang Duy M.
Fujitsu Microelectronics Inc.
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