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SIGNAL COMPRESSING SYSTEM

  • US 20110085599A1
  • Filed: 12/28/2010
  • Published: 04/14/2011
  • Est. Priority Date: 02/29/1992
  • Status: Active Grant
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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