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Enhanced embedded zerotree wavelet algorithm for lossy image coding

机译:增强的嵌入式零树小波算法用于有损图像编码

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摘要

Embedded zerotree wavelet (EZW) algorithm is the well-known effective coding technique for low-bit-rate image compression. In this study, the authors propose a modification of this algorithm, namely new enhanced EZW (NE-EZW), allowing to achieve a high compression performance in terms of peak-signal-to-noise ratio and bitrate for lossy image compression. To distribute probabilities in a more efficient way, the proposed approach is based on increasing the number of coefficients not to be encoded by the use of new symbols. Furthermore, the proposed method optimises the binary coding by the use of the compressor cell operator. Experimental results demonstrated the effectiveness of the proposed scheme over the conventional EZW and other improved EZW schemes for both natural and medical image coding applications. They have also shown that the proposed approach outperforms the most well-known algorithms, namely set partitioning in hierarchical trees (SPIHT) and JPEG2000.
机译:嵌入式零树小波(EZW)算法是众所周知的用于低比特率图像压缩的有效编码技术。在这项研究中,作者提出了对该算法的一种改进,即新的增强型EZW(NE-EZW),从而可以在有损图像压缩的峰信噪比和比特率方面实现高压缩性能。为了以更有效的方式分配概率,所提出的方法是基于增加不通过使用新符号来编码的系数的数量。此外,所提出的方法通过使用压缩单元运算符来优化二进制编码。实验结果证明了该方案相对于常规EZW和其他改进的EZW方案在自然和医学图像编码应用中的有效性。他们还表明,所提出的方法优于最著名的算法,即分层树中的集划分(SPIHT)和JPEG2000。

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