| 一种改进的嵌入式零树小波编码算法 |
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| 引用本文： | 金彩虹,高玲.一种改进的嵌入式零树小波编码算法[J].南京晓庄学院学报,2009,25(3):82-85. |
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| 作者姓名： | 金彩虹 高玲 |
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| 作者单位： | 南京晓庄学院物理与电子工程学院,江苏,南京,211171 |
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| 摘 要： | 嵌入式零树小波编码算法(EZW)为了确定一系数是零树根还是孤立零,必须对该系数进行反复多次扫描,不仅耗时,而且造成二进制符号流中存在大量冗余.在研究Shapiro零树图像编码算法的基础上,通过对重要系数的全新界定和精确量化,增加零树的数量,减少孤立零点,从而缩短搜索扫描编码时间、提高压缩比.实验结果表明:改进的嵌入式零树小波编码算法在峰值信噪比、编码时间、图像恢复质量等方面都优于J.M.Shapiro最初提出的EZW算法.
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| 关 键 词： | 小波变换 零树 峰值信噪比 编码时间 |
Improved Image Coding Algorithm Based on Embedded Zerotree Wavelet |
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| JIN Cai-hong,GAO Ling.Improved Image Coding Algorithm Based on Embedded Zerotree Wavelet[J].Journal of Nanjing Xiaozhuang College,2009,25(3):82-85. |
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| Authors: | JIN Cai-hong GAO Ling |
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| Institution: | Nanjing Xiaozhuang University;Nanjing 211171;China |
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| Abstract: | The improved image coding algorithm was put forward to improve the deficiency of embedded zerotree wavelet(EZW) by redefining significant coefficient and exacting quantization.The algorithm increased the numbers of zerotree and improved the coding efficiency.In comparison to the previous EZW algorithm,the results of the experiment showed that the new algorithm performed better in the peak signal-to-noise ratio(PSNR) and coding speed. |
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