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Hierarchical adaptive multistage vector quantization

  • US 5,799,110 A
  • Filed: 11/09/1995
  • Issued: 08/25/1998
  • Est. Priority Date: 11/09/1995
  • Status: Expired due to Term
First Claim
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1. An hierarchical adaptive multistage vector quantizer to supply compressed video signals to a transmission line, said hierarchical adaptive multistage vector quantizer comprising:

  • means for receiving a vector I having a particular magnitude reflective of a portion of a video signal;

    mean removal means for performing mean removal on vector I to provide a mean removed vector IM ;

    an vector quantizer having "N" stages in which N equals 3 or more, the first stage performing vector quantization (VQ) and inverse vector quantization (YQ-1) of the vector IM to obtain a residual vector E1-, the (N-1)th second stage performing VQ and inverse vector quantization (VQ-1) of the residual vector E1 to obtain a residual vector EN-1 and the Nth stage performing vector quantization (VQ) and inverse vector quantization (VQ-1) of the residual vector ENN-1 to obtain residual vector EN ;

    comparison means for comparing each vector(IM, E1, EN-1, . . . EN) to a threshold when each such vector is generated; and

    vector reduction means connected to be operative when residual vector EN is greater than said threshold for selecting a subsection of vector I for processing by the vector quantizer and for processing the comparison means until a residual vector (rs), is equal to or less than said threshold; and

    means to generate and transmit to a transmission line an address representing said residual vector rs when said residual vector (rs) is equal to or less than said threshold.

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