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Code amount control device and encoding apparatus using the same

  • US 6,438,167 B1
  • Filed: 11/12/1998
  • Issued: 08/20/2002
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Term
First Claim
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1. An encoding apparatus comprising:

  • a) block forming means for dividing an input signal into blocks each consisting of a plurality of sample values;

    b) orthogonal conversion means for orthogonally converting the input signal blocks;

    c) detection means for detecting a characteristic of each of the blocks in accordance with orthogonal conversion coefficients obtained by said orthogonal conversion means;

    d) selection means for selecting optimal quantization parameters which can realize a constant code amount obtained when the input signal blocks are encoded in a unit consisting of a plurality of input signal blocks;

    e) changing means for changing the quantization parameters selected by said selection means in accordance with an output from said detection means;

    f) encoding means for encoding the orthogonal conversion coefficients from said orthogonal conversion means using the quantization parameters changed by said changing means; and

    g) discrimination means for discriminating whether the input signal is a luminance component signal or a color component signal, wherein said changing means changes the quantization parameters selected by said selection means in accordance with an output from said discrimination means.

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