An Adaptive DCT Coding with Geometrical Edge Representation

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概要

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• Discrete cosine transform (DCT) coding has been proven to be an efficient means of image compression coding. A lot of efforts have been made to improve the coding efficiency of DCT based coding. This paper presents an adaptive DCT coding based on geometrical edge representation. This scheme is designed to properly exploit the correlation between edge direction and distribution of DCT coefficients. Edges are extracted from original images first. Then, sub-optimal block-size and scanning order are determined at each block based on the extracted edges. In this way an adaptive DCT scheme taking account of local characteristics of image can be achieved, It is shown through the simulations that the proposed algorithm outperforms a conventional coding scheme in terms of coding efficiency by 10-15%.

• 社団法人電子情報通信学会の論文
• 2003-06-01

著者

• Itoh Yuji

  Dces Technology Center Texas Instruments Japan Limited

関連論文

• Inter-Chrominance Up-Sampling Algorithm for Color Post-Processing(Regular Section)
• An Adaptive DCT Coding with Geometrical Edge Representation

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