Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1990-02-27
1991-06-04
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358433, 382 41, H04N 1415
Patent
active
050218913
ABSTRACT:
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.
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Coles Sr. Edward L.
Miller Russell B.
Qualcomm Inc.
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