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Image data coding and restoring method and apparatus for coding and restoring the same

  • US 5,861,922 A
  • Filed: 04/12/1996
  • Issued: 01/19/1999
  • Est. Priority Date: 09/16/1992
  • Status: Expired due to Term
First Claim
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1. A method of decoding coded image data of a valid block, said method comprising:

  • (a) decoding the coded image data of the valid block into decoded image data of the valid block, the valid block being one of first blocks having original image data with a variation greater than a predetermined threshold when compared to previous original image data of a corresponding block in a same position of second blocks in a reference frame, where only the original image data of valid blocks are encoded and the second blocks in the reference frame are renewed using the original image data of the valid blocks, where the second blocks in the reference frame contain the previous original image data of the valid blocks;

    (b) identifying an address of an image memory for writing the decoded image data of the valid block, based on block information indicating which of the first blocks corresponds to the valid block; and

    (c) writing the decoded image data of the valid block into the image memory in accordance with the address.

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