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Video coding and video decoding apparatus for enlarging a decoded alpha-map signal in accordance with a reduction ratio setting information signal

  • US 6,130,913 A
  • Filed: 11/20/1998
  • Issued: 10/10/2000
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Fees
First Claim
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1. A picture decoding apparatus comprising:

  • a demultiplexing section configured to demultiplex a coded signal into an alpha-map signal for discriminating a picture between an object region and a background region, and 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, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4;

    an alpha-map decoder section configured to decode the demultiplexed alpha-map signal to separate it into a decoded alpha-map and reduction ratio setting information;

    a resolution conversion section configured to enlarge the decoded alpha-map signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged alpha-map signal; and

    a picture decoding section configured to decode the coded picture signal in accordance with the enlarged alpha-map signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal.

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