Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication
Patent
1994-04-25
1996-04-02
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Reduced time or bandwidth for static image communication
3582613, 3582621, 358432, 358433, 382197, H04N 1415, H04N 1411, G06K 934, G06K 938
Patent
active
055045910
ABSTRACT:
A system and method for compressing raster graphic or bit-map data reduces the storage requirements for the bit-map data. The system divides the bit-map data into one or more chaingons, which are a series of pixels that are contiguous in either the horizontal direction, the vertical direction, or diagonally. Each chaingon is defined by its starting location in the bit-map, and its length. Each chaingon is encoded separately using delta encoding with respect to the starting location of the chaingon. The delta encoding uses variable length data codes where the most common delta values are assigned the fewer data bits and the less common delta values are assigned more data bits. The delta encoded chaingons may be compressed to save additional storage space. The system may be readily used in any computer system where bit-map data files are stored or transmitted to a second computer. The invention is particularly useful in printers or facsimile machines where character fonts are transmitted along with text data. The character fonts may be processed using the present invention prior to transmission.
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Coles Sr. Edward L.
Microsoft Corporation
Williams Kimberly A.
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