Signal compressing system
First Claim
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1. A video signal compression apparatus, comprising:
- a scanner which is operative to scan a quantized set of video frequency coefficients of an individual sub-block according to a scanning pattern which is selected from a plurality of scanning patterns to produce a set of reordered coefficients;
an entropy coder which is operative to entropy encode the set of reordered coefficients and output an entropy encoded signal; and
a transmitter which transmits the entropy encoded signal and a scan selection signal that is not entropy encoded,wherein the scan selection signal indicates the scanning pattern.
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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.
60 Citations
4 Claims
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1. A video signal compression apparatus, comprising:
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a scanner which is operative to scan a quantized set of video frequency coefficients of an individual sub-block according to a scanning pattern which is selected from a plurality of scanning patterns to produce a set of reordered coefficients; an entropy coder which is operative to entropy encode the set of reordered coefficients and output an entropy encoded signal; and a transmitter which transmits the entropy encoded signal and a scan selection signal that is not entropy encoded, wherein the scan selection signal indicates the scanning pattern. - View Dependent Claims (2, 3, 4)
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Specification