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Block entropy coding in embedded block coding with optimized truncation image compression

  • US 6,658,159 B1
  • Filed: 03/17/2000
  • Issued: 12/02/2003
  • Est. Priority Date: 03/17/2000
  • Status: Expired due to Fees
First Claim
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1. A method for compressing image data, comprising the steps of:

  • decomposing the image data into code-blocks of coefficients using a transform, each code-block comprising a plurality of bit-planes from a most significant bit-plane to a least significant bit-plane;

    processing bit-planes of coefficient data in the code blocks in multiple coding passes to generate raw bit-plane data;

    arithmetically coding a portion of raw bit-plane data to generate arithmetically coded data; and

    writing the arithmetically coded data and the raw bit-plane data not arithmetically coded directly into a bit-stream;

    wherein raw bit-plane data generated during significance propagation and magnitude refinement coding passes for bit-planes p<

    p0

    K is written directly into the bit-stream, wherein p0 denotes the most significant bit-plane of a code block in which any sample therein becomes contextually significant during arithmetic coding and K is an integer parameter.

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