Image compression featuring selective re-use of prior compression data

  • US 6,697,061 B1
  • Filed: 01/21/1999
  • Issued: 02/24/2004
  • Est. Priority Date: 01/21/1999
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of editing an input image frame using an editor, an input buffer, a de-compression engine and a compression engine, said method comprising:

  • dividing the input image frame into plural spatial regions;

    storing data from at least one of the spatial regions as compressed input data in the input buffer;

    using the de-compression engine to convert data of the input image frame to the spatial domain;

    editing with the editor at least one of the input image frame, an anchor frame upon which the input image frame depends, and the order of the input image frame relative to an anchor frame upon which the input image depends to thereby prepare spatial domain output data for compression; and

    using the compression engine to convert the spatial domain output data to compressed output data;

    wherein, using the editing device includes creating a table having an entry for each region, where each entry represents whether predetermined editing has been performed with respect to the associated region which affects whether the compressed input data (for the associated region) in the input buffer may be re-used as part of the compressed output data, and using the compression engine to convert includes re-using at least some of the compressed input data from the input buffer to produce compressed output data, in dependence upon the entries in the table.

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