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Picture transmission system using minimal reference-frame modification to recover from transmission errors

  • US 6,683,988 B1
  • Filed: 10/05/1999
  • Issued: 01/27/2004
  • Est. Priority Date: 10/08/1998
  • Status: Expired due to Term
First Claim
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1. A method of recovering from a transmission error in a picture transmission system that transmits a series of pictures from a coding apparatus to a decoding apparatus, each picture in the series being coded at the coding apparatus with reference to a preceding picture in the series, and decoded at the decoding apparatus with reference to the same preceding picture in the series, comprising the steps of:

  • (a) detecting a decoding error, caused by said transmission error, at said decoding apparatus;

    (b) transmitting an error signal from said decoding apparatus to said coding apparatus, informing said coding apparatus of said coding error;

    (c) selecting a reference picture in said series of pictures;

    (d) determining a part of said reference picture made undecodable by said decoding error;

    (e) modifying said part of said reference picture in said coding apparatus, thereby obtaining a first modified reference picture;

    (f) identically modifying said part of said reference picture in said decoding apparatus, thereby obtaining a second modified reference picture;

    (g) coding a subsequent picture, following said reference picture in said series, with reference to said first modified reference picture at said coding apparatus; and

    (h) decoding said subsequent picture with reference to said second modified reference picture at said decoding apparatus.

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