Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-03-22
1994-01-04
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
3582613, 358133, 358136, 358138, 358426, 358432, H04N 141
Patent
active
052765253
ABSTRACT:
A signal coder is disclosed with improved compression of pictorial data that has been decomposed into plural subbands through a two-dimensional quadrature-mirror decomposition (102). In each of the higher frequency bands, the decomposed samples are quantized and then partitioned (106, 110, 114), in two dimensions, into blocks. The blocks in each band are scanned (107, 111, 115) in a way that exploits the characteristics of the band so as to increase the average length of the runs of zero and nonzero quantized samples. The bands containing horizontal, vertical and diagonal edge information are scanned with a horizontal, vertical, and diagonal zig-zag pattern, respectively. These scanned bands are entropy coded (108, 112, 116) using run-length coding to code the runs of either zero band or nonzero quantized samples.
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Bell Communications Research Inc.
Coles Sr. Edward L.
Gurey Stephen M.
Stoll Thomas L.
Suchyta Leonard Charles
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