二维无损离散余弦变换

Proceedings 2001 International Conference on Image Processing (Cat. No.01CH37205) Pub Date : 2001-10-07 DOI:10.1109/ICIP.2001.958152

K. Komatsu, K. Sezaki

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引用次数: 20

摘要

由于无损DCT与JPEG或MPEG兼容，因此有望在统一无损/有损图像编码中发挥重要作用。然而，存在一个问题，即无损DCT的变换系数与(有损)DCT的变换系数相差不是很小。我们提出了基于4点二维无损WHT的二维无损DCT设计，并指出其舍入次数比一维无损DCT少，因此其变换系数与DCT之间的差异变小。

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2D lossless discrete cosine transform

Since the lossless DCT is compatible with JPEG or MPEG, it is expected to play an important role in unified lossless/lossy image coding. However, there is a problem that the difference between the transform coefficients of the lossless DCT and those of the (lossy) DCT is not very small. We present the design of a two dimensional lossless DCT based on a 4-point two dimensional lossless WHT and indicate that its number of rounding off becomes smaller than that of the one dimensional lossless DCT and, as a result, the difference between its transform coefficients and those of the DCT becomes small.

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Proceedings 2001 International Conference on Image Processing (Cat. No.01CH37205)

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