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Decoding apparatus using tool information for constructing a decoding algorithm

  • US 6,310,981 B1
  • Filed: 09/29/1999
  • Issued: 10/30/2001
  • Est. Priority Date: 10/12/1995
  • Status: Expired due to Term
First Claim
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1. A coded image data-decoding apparatus, comprising:

  • a receiver for receiving coded image data, and information identifying tools constituting a decoding algorithm for decoding the coded image data;

    a storage device for storing multiple tools in a hierarchical manner such that tools for an N+1 ranked layer perform decoding with a lower image quality as a substitute for tools of an N ranked layer;

    a selector for selecting multiple tools by comparing the tool identifying information with the stored tools;

    a constructor for constructing the decoding algorithm from the selected multiple tools; and

    a decoder for decoding the coded image data by applying the constructed decoding algorithm, wherein when the receiver receives information identifying M-ranked tools, the M-ranked tools are not stored in the storage device, and the selector selects L-ranked tools, where L is greater than M in rank, so as to construct the decoding algorithm.

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