关键词: Contourlet变换, 非均匀标量量化, 死区量化, Lloyd-Max算法

Abstract: Combining non-separable and directional filters banks, the Contourlet transform can effectively capture more edges and contours in natural images than wavelets due to its capability of representing directional information. In view of JPEG2000 compression standard, which uses the wavelet transform and dead-zone uniform quantizer, the paper proposes a new coding scheme based on Contourlet transform and optimal quantizer. Similarly, this article is applied to the dead-zone quantization in the optimal quantizer.

Key words: Contourlet transform, non uniform scalar quantization, dead-zone uniform quantizer, algorithm of Lloyd-Max