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Video coding and video decoding apparatus

  • US 6,546,138 B1
  • Filed: 08/25/1999
  • Issued: 04/08/2003
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Fees
First Claim
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1. A computer system for encoding pictures, comprising:

  • a first resolution converter configured to reduce an alpha-map signal to control an amount of generated codes of the alpha-map signal by changing a resolution conversion according to a reduction ratio setting information signal, the alpha map signal indicating information for discriminating a picture between an object region and a background region;

    an alpha-map encoder configured to encode a reduced alpha-map signal output from said first resolution converter and the reduction ratio setting information signal to output coded alpha-map data and coded reduction ratio setting information data;

    a second resolution converter configured to enlarge the reduced alpha-map signal at an enlargement ratio to return the reduced alpha-map signal to an original size and output an enlarged alpha-map signal;

    a multiplexer which multiplexes the coded alpha-map data and the coded reduction ratio setting information data; and

    a video encoder configured to encode, in accordance with the enlarged alpha-map signal, a picture corresponding to the enlarged alpha-map signal.

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