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Video coding and video decoding apparatus

  • US 6,975,768 B2
  • Filed: 10/03/2002
  • Issued: 12/13/2005
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Fees
First Claim
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1. A decoding apparatus which decodes pictures, comprising:

  • a demultiplexer which demultiplexes a coded signal into an alpha-map signal for discriminating a picture between an object region and a background region, and into a coded picture signal, the alpha-map signal including a reduction ratio setting information signal for reducing an amount of generated codes of the alpha-map signal;

    a decoder which decodes the alpha-map signal that has been demultiplexed by the demultiplexer, to separate the alpha-map signal into a decoded alpha-map signal and reduction ratio setting information;

    a resolution converter which enlarges the decoded alpha-map signal in accordance with the reduction ratio setting information; and

    a picture decoder which decodes the coded picture signal in accordance with the enlarged alpha-map signal and outputs a reconstructed picture signal.

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