Side-match and overlap-match vector quantizers for images

Details Side-match and overlap-match vector quantizers for images Side-match and overlap-match vector quantizers for images

H - Electricity

04

N

350/33

H04N 1/41 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/28 (2006.01) H04N 7/30 (2006.01)

Patent

CA 1315392

- 26 - SIDE-MATCH AND OVERLAP-MATCH VECTOR QUANTIZERS FOR IMAGES Abstract There is disclosed a method and apparatus for data coding for image transmission or storage in which vector quantization enables good image quality at reduced transmission or storage bit rates by directly employing spatial contiguity with a prior block of data, or a one-row-prior block of data in a way that directly controls intensity continuity between spatially close pixels of the adjacent blocks in two directions. The technique includes both "side-match" (no overlap) and "overlap-match" vector quantization. The technique is relative demanding of memory space and logic capacity in the encoding of the image information; but the decoding can be relatively simple and thus is well adapted for archiving and subsequent retrieval of two-dimensional information.

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