SIGNAL COMPRESSING SYSTEM
First Claim
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1. A video signal compression apparatus, comprising:
- a transformer which outputs a set of video frequency coefficients of an individual sub-block;
a quantizer which outputs a quantized set of video frequency coefficients;
a scanner which is operative to scan the quantized set of video frequency coefficients according to a scanning pattern which is selected from a plurality of scanning patterns, the scanning pattern scanning each of a plurality of sub-blocks having n X n coefficients, in a following sequence;
M(0,0), M(1,0), M(0,1), M(0,2), M(1,1), M(2,0), M(3,0), M(2,1), M(1,2), . . . , M(n−
1,n−
1), from lowest frequency to highest frequency to produce a set of reordered coefficients; and
an entropy coder which is operative to entropy encode the set of reordered coefficients and output an entropy encoded signal,wherein the scanning pattern is indicated by a scan selection signal which is not entropy encoded.
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Abstract
A multi-scanner scans a signal according to several different patterns. A scanning pattern selector determines which scanning pattern produced the most efficient coding result, for example, for runlength coding, and outputs a coded signal, coded most efficiently, and a selection signal which identifies the scanning pattern found to be most efficient.
56 Citations
3 Claims
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1. A video signal compression apparatus, comprising:
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a transformer which outputs a set of video frequency coefficients of an individual sub-block; a quantizer which outputs a quantized set of video frequency coefficients; a scanner which is operative to scan the quantized set of video frequency coefficients according to a scanning pattern which is selected from a plurality of scanning patterns, the scanning pattern scanning each of a plurality of sub-blocks having n X n coefficients, in a following sequence;
M(0,0), M(1,0), M(0,1), M(0,2), M(1,1), M(2,0), M(3,0), M(2,1), M(1,2), . . . , M(n−
1,n−
1), from lowest frequency to highest frequency to produce a set of reordered coefficients; andan entropy coder which is operative to entropy encode the set of reordered coefficients and output an entropy encoded signal, wherein the scanning pattern is indicated by a scan selection signal which is not entropy encoded. - View Dependent Claims (2, 3)
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Specification