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清华大学电子工程系
纸质出版:1997
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[1]王祥林,吴国威,林行刚.一种基于零树的多码率小波图象编码方法[J].电子学报,1997(04):48-51.
王祥林, 吴国威, 林行刚. A Zerotree Based Multirate Wavelet Image Coding Method[J]. Acta Electronica Sinica, 1997, (4).
[1]王祥林,吴国威,林行刚.一种基于零树的多码率小波图象编码方法[J].电子学报,1997(04):48-51. DOI:
王祥林, 吴国威, 林行刚. A Zerotree Based Multirate Wavelet Image Coding Method[J]. Acta Electronica Sinica, 1997, (4). DOI:
本文研究以零树方法进行小波图象压缩编码,在零树编码各级小波系数前,根据不同分解级小波系数幅值(即幅度的绝对值)间的相关特性,通过以树结构对小波系数的能量估测与排序,不仅优化了码率的分配,提高编码图象PSNR约0.3~0.1dB,而且加速了编解码过程各约10%,同时该编码方案仍保持零树编码产生嵌入式码流,支持多码率图象解码.
In this paper
a new zerotree based wavelet image coding scheme is put forward.Prior to zerotree coding
all the wavelet coefficients are rearranged according to their energy estimation based on tree structure. As a result
bit allocation is optimized and PSNR is improved by 0.3-0. 5dB. Meanwhile
both encoding and decoding processes are about 10% less time-consuming
Furthermore
the code stream produced is embedded and able to support multirate image decoding.
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