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Device and method for encoding digital image

  • US 20040032989A1
  • Filed: 07/09/2003
  • Published: 02/19/2004
  • Est. Priority Date: 07/10/2002
  • Status: Active Grant
First Claim
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1. A digital image encoding device comprising:

  • conversion means for converting digital image data into a coefficient based on a spatial frequency;

    quantization means for quantizing the coefficient obtained by said conversion means; and

    coefficient bit modeling means for carrying out coefficient bit modeling by using said coefficient quantized by said quantization means, wherein said digital image data is divided into a plurality of subbands in said conversion means, said coefficient bit modeling means comprises;

    code block division means for dividing each of said subbands into a plurality of code blocks;

    bit plane decomposition means for decomposing each of coefficients of said code blocks obtained by said code block division means into a plurality of bit planes for each bit weight;

    subbit plane decomposition means for decomposing each of said bit planes obtained by said bit plane decomposition means into a plurality of subbit planes based on usefulness; and

    predetermined data generation means for generating predetermined data in accordance with said subbit planes obtained by said subbit plane decomposition means, and said coefficient bit modeling means comprises requantization means for requantizing a predetermined subbit plane among said subbit planes obtained by said subbit plane decomposition means and passing data after said requantization to said predetermined data generation means.

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