Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-07-30
1993-01-26
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358450, 358462, H04N 140
Patent
active
051826569
ABSTRACT:
This method relates to the compression of information contained in filled-in forms (O) by separate handling of the corresponding empty forms (CP) and of the information written into them (VP). Samples of the empty forms are pre-scanned, the data obtained digitized and stored in a computer memory to create a forms library. The original, filled-in form (O) to be compressed is then scanned, the data obtained digitized and the retrieved representation of the empty form (CP) is then subtracted, the difference being the digital representation of the filled-in information (VP), which may now be compressed by conventional methods or, preferably, by an adaptive compression scheme using at least two compression ratios depending on the relative content of black pixels in the data to be compressed.
REFERENCES:
patent: 4430526 (1984-02-01), Brown et al.
patent: 4542411 (1985-09-01), Imanaka et al.
patent: 5001769 (1991-03-01), Reid-Green et al.
Chevion Dan S.
Karnin Ehud D.
Walach Eugeniusz
Cockburn Joscelyn G.
Coles Sr. Edward L.
Grant II Jerome
International Business Machines - Corporation
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