Optimum Quantization Step Size for Integer Lossless Transform Coefficients

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  • 整数ロスレス変換係数に対する最適量子化ステップサイズ(映像メディアおよび一般 インターネット, デジタル放送, マルチメディア, 三次元画像, 視覚と画質評価, ITS等)
  • 整数ロスレス変換係数に対する最適量子化ステップサイズ
  • セイスウ ロスレス ヘンカン ケイスウ ニ タイスル サイテキ リョウシカ ステップサイズ

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Description

The DOT and wavelet coefficients have real values which are continuously distributed. Therefore the entropy of the quantized transform coefficients is also varied continuously, when the quantization step size is continuously changing. On the other hand, the integer lossless DCT and wavelet coefficients have integral values. Therefore the entropy of the quantized transform coefficients is not varied continuously for the quantization step size. Thus we must carefully determine the quantization step size for the integer lossless DCT and wavelet coefficients to make lossy compression efficiency high. In this paper, we will illustrate that we can not make use of the optimum step size of the lossy version as it is and propose the optimum quantization step size for the integer lossless transforms.

Journal

  • ITE Technical Report

    ITE Technical Report 26.8 (0), 85-90, 2002

    The Institute of Image Information and Television Engineers

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