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Video coding device and video decoding device

  • US 20020009142A1
  • Filed: 06/07/2001
  • Published: 01/24/2002
  • Est. Priority Date: 05/29/1997
  • Status: Active Grant
First Claim
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1. A video coding device provided with a subband-decomposing means for decomposing an image being composed of N (N≧

  • 2) kinds of luminance or chrominance components into subband images for each of components An (1≦

    n≦

    N, where n is an integer) composing an image to be coded, coefficient coding means for encoding a frequency coefficient of the subband images, rearranging means for preparing integrated component units by combining frequency coefficients included in respective components An according to the coded coefficient data prepared by the coefficient coding means and rearranging the prepared integrated component units of the coefficient-coded data in an ascending order of subband image resolution, starting from the integrated component unit including the coded coefficient data of the lowest resolution subband, and a variable-length coding means for performing variable-length encoding of the rearranged coefficient-coded data, wherein the rearranging means prepares each of the integrated component units by setting therein the frequency coefficients contained in the respective components An, said coefficients being all frequency-coefficients included in m (m≧

    1) subbands for respective components An when the components An have the same size and the same number of subbands.

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