Image analysis – Color image processing – Compression of color images
Patent
1997-04-30
2000-10-03
Couso, Jose L.
Image analysis
Color image processing
Compression of color images
382162, 382232, G06K 900, G06K 936
Patent
active
061284068
ABSTRACT:
A method of compressing a block of graphics image data into a compressed block operates on uncompressed bitmap image data to generate a compressed representation of the image. It also operates on compressed bitmap image data to generate the original, uncompressed representation. 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. A data structure for the block is generated to store the number of distinct colors present in the block, a compression image quality mask value, the actual RGBA quadruplet for each color present in the block, and for each distinct color, sets of group and line binary flags indicating the presence of a particular color at a particular pixel within the block. The data structure for the block is then stored in memory or in a computer file and the next block of the image is processed. This process is repeated for all blocks of the bitmap image. To decompress the image, the RGBA quadruplets of all pixels within each block are reconstructed from the data structure for the block. This reconstruction is repeated for all blocks in the image. Both lossless and lossy compression methods are provided.
REFERENCES:
patent: 5253078 (1993-10-01), Balkanski et al.
patent: 5408542 (1995-04-01), Callahan
patent: 5424755 (1995-06-01), Lucas et al.
patent: 5585944 (1996-12-01), Rodriquez
Couso Jose L.
Dang Duy M.
Fujitsu Microelectronics Inc.
LandOfFree
Method of compressing and decompressing graphics images does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of compressing and decompressing graphics images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of compressing and decompressing graphics images will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-203017