| 一种基于Contourlet的无表零树图像编码算法 |
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| 引用本文： | 金炜,潘英俊,魏彪,冯鹏.一种基于Contourlet的无表零树图像编码算法[J].电子与信息学报,2006,28(11):2116-2120. |
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| 作者姓名： | 金炜 潘英俊 魏彪 冯鹏 |
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| 作者单位： | 1. 重庆大学光电技术及系统教育部重点实验室,重庆,400044;宁波大学信息科学与工程学院,宁波,315211
2. 重庆大学光电技术及系统教育部重点实验室,重庆,400044 |
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| 摘 要： | 该文提出一种低存储量、高压缩性能的基于Contourlet变换的无表零树编码算法。通过对Contourlet系数的重新组合，该算法采用类似LZC的零树结构；为了充分利用Contourlet变换对二维分段光滑函数的良好表达能力，设计了不同于LZC 算法的扫描顺序和标志图表示，降低了编解码复杂度。实验结果表明，该算法用于图像编码是有效的，在相同压缩比下，其主观视觉质量和PSNR都明显优于基于小波变换的LZC和SPIHT算法，尤其对于含有丰富纹理的图像。
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| 关 键 词： | 图像压缩 多尺度几何分析 Contourlet变换 无表零树编码 |
| 文章编号： | 1009-5896(2006)11-2116-05 |
| 收稿时间： | 2005-03-08 |
| 修稿时间： | 2005-10-15 |
An Image Coding Algorithm Based on Contourlet Listless Zerotree Coding |
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| Jin Wei,Pan Ying-jun,Wei Biao,Feng Peng.An Image Coding Algorithm Based on Contourlet Listless Zerotree Coding[J].Journal of Electronics & Information Technology,2006,28(11):2116-2120. |
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| Authors: | Jin Wei Pan Ying-jun Wei Biao Feng Peng |
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| Affiliation: | The Key Lab of Optoelectronic Technology & System, Ministry of Education, Chongqing University, Chongqing 400044, China;Faculty of Information Science & Technology, Ningbo University, Ningbo 315211, China |
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| Abstract: | This paper presents a new image coding algorithm based on the Contourlet Listless Zerotree Coding (CLZC) with lower memory requirement and higher compression performance. This new algorithm adopts Zerotree structure analogical to LZC by repositioning the Contourlet coefficients. Furthermore, in order to take advantage of the good performance of Contourlet in approximation for 2D piecewise smooth functions, a reasonable scanning order and new flag maps different from LZC are designed, which reduce the complexity in the encoding and decoding procedure. The experiments demonstrate that the proposed algorithm is efficient in coding images; it outperforms the wavelet-based LZC and SPIHT algorithms both visually and in terms of PSNR under the same compression ratio, especially for the images including a large portion of texture. |
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| Keywords: | Image compression Multiscale geometric analysis Contourlet transform Listless Zerotree Coding(LZC) |
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