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Constant bitrate algorithm for block based image compression

  • US 6,614,942 B1
  • Filed: 12/17/1999
  • Issued: 09/02/2003
  • Est. Priority Date: 12/17/1999
  • Status: Expired due to Term
First Claim
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1. A method of compressing image data for an image, said method comprising:

  • a) receiving a target compression ratio specifying a ratio of uncompressed image data to compressed image data;

    b) selecting a subset of said image data;

    c) compressing image data in said subset using a first quantization parameter;

    d) calculating a first compression ratio for said subset;

    e) calculating a target quantization parameter based on said first quantization parameter and said first compression ratio, said target quantization parameter corresponding approximately to said target compression ratio; and

    f) compressing said image data using said target quantization parameter.

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