用维纳滤波改善零树编码图象的质量

Improve the Quality of Zero-tree Encoded Images using Wiener Filtering

基于零树小波编码的图象在高压缩比时会产生振铃失真。本文分析了失真的原因，提出采用边沿增强与一维维纳滤波相结合的方法减少失真。实验结果表明，这种方法简单有效，能够提高图象的主观质量与客观指标PSNR。

Ringing distortion would exist in zero-tree wavelet encoded images with high compression-ratio. The cause leading to the distortion is investigated and a scheme of solution using edge enhancement combined with 1D-Wiener filtering is proposed to reduce the distortion. Experimental results demonstrate that the quality of such images can be improved effectively both in subjective and objective point of view.