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在研究Shapiro零树图像编码方案的基础上 ,提出了一种改进型的自适应嵌入式零树编码方法 .本算法利用自适应的小波系数 ,增加了编码过程中零树个数 ,提高了编码效率 ,使在相同压缩率情况下 ,提高PSNR约为 0 1～ 0 6dB ,同时该编码方案仍保持零树编码产生嵌入式码流、支持多码率解码的特点
Based on the study of Shapiro zero-tree image coding scheme, an improved adaptive embedded zerotree coding method is proposed.The algorithm uses adaptive wavelet coefficients to increase the number of zerotrees in the coding process and improve the coding Efficiency so that the PSNR will be improved from 0 1 ~ 0 6dB at the same compression rate while the coding scheme still maintains the embedded code stream generated by zero-tree coding and supports the features of multi-rate decoding