Two-dimensional block scanning for subband image and video coding
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Mar 22, 1991
filing date -
Mar 22, 1991
priority date (Note) -
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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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