Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1993-08-04
1995-09-19
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
3582612, 348404, H04N 1415
Patent
active
054521041
ABSTRACT:
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.
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Coles Sr. Edward L.
English Sean
Miller Russell B.
Qualcomm Incorporated
Vu Kim Yen
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