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Temporal compression and decompression for video

  • US 6,008,847 A
  • Filed: 03/03/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 04/08/1996
  • Status: Expired due to Term
First Claim
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1. A method for performing temporal compression and decompression of color video data, comprising the steps of:

  • a) receiving a new frame of said video data;

    b) determining differences between contents of said new frame and contents of an on-screen video image displayed from previous frames of said video data;

    c) designating as updating information data from regions of said new frame for which said differences exceed an updating threshold;

    d) determining updating quality of video compression to be applied to said updating information so that said updating information takes up no more than bandwidth available for a video transmission in which said updating information is transferred to a device displaying said video image;

    e) when said updating information fits within said bandwidth, designating for inclusion in said updating information data from other regions of said new frame corresponding to other regions of said on-screen image displayed by said device with a display quality less than said updating quality;

    f) compressing said updating information at a compression level consistent with said updating quality;

    g) forming said video transmission by merging the compressed updating information with block marks indicating the on-screen blocks to be updated with the compressed updating information; and

    h) appending to said video transmission a representation of said updating quality.

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