05452104 is referenced by 181 patents and cites 15 patents.

In an adaptive block size image compression method and system for compressing image data, a respective method and system for further compressing the 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. A discrete quadtree transform (DQT) operation is in supplement of the adaptive block size block selection with coefficient replacement to optimize image data compression.

Title
Adaptive block size image compression method and system
Application Number
487012
Publication Number
5452104
Application Date
August 4, 1993
Publication Date
September 19, 1995
Inventor
Chong U Lee
San Diego
CA, US
Agent
Sean English
Russell B Miller
Assignee
Qualcomm Incorporated
CA, US
IPC
H04N 1/415
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