05107345 is referenced by 236 patents and cites 13 patents.

An image compression system and method for compressing image data for transmission. Each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation. Varying levels of sub-blocks of resulting corresponding transform coefficients are selected for construction into a composite transform coefficient block corresponding to each input block of pixel data. The selection of transform coefficient block size for the composite block is determined by a comparison process between transform block and sub-block coding efficiency. The composite block is variable length coded to further reduce bit count in the compressed data.

Title
Adaptive block size image compression method and system
Application Number
487012
Publication Number
5107345
Application Date
May 28, 1991
Publication Date
April 21, 1992
Inventor
Chong U Lee
San Diego
CA, US
Assignee
Qualcomm Incorporated
IPC
H04N 1/415
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