| 基于小波压缩和混沌置乱的图像处理算法 |
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| 引用本文： | 邓绍江,濮忠良,张岱固.基于小波压缩和混沌置乱的图像处理算法[J].重庆大学学报(自然科学版),2008,31(8):918-921. |
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| 作者姓名： | 邓绍江 濮忠良 张岱固 |
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| 作者单位： | 重庆大学计算机学院,重庆,400030;重庆大学计算机学院,重庆,400030;重庆大学计算机学院,重庆,400030 |
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| 摘 要： | 提出一种图像压缩和加密相结合处理方法.利用小波变换的多分辨率特性,对灰度图像进行小波分解,得到低频近似分量和三个方向的细节分量;根据人眼视觉特性,对细节部分系数矩阵进行阈值调制,实现对图像的压缩;利用混沌系统伪随机、遍历性等特性,对集中了原图大部分能量的低频近似系数矩阵进行混沌置乱,实现对图像的加密;用阈值调制后的细节系数矩阵和置乱后的低频加密矩阵进行小波反变换,得到最终的图像.仿真结果表明,此算法在压缩和加密的结合处理上,表现出良好的性能.
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| 关 键 词： | 小波变换 图像压缩 混沌置乱 加密 |
An algorithm of image processing based on discrete wavelet transform compression and chaotic scrambling |
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| DENG Shao jiang,PU Zhong liang and ZHANG Dai gu.An algorithm of image processing based on discrete wavelet transform compression and chaotic scrambling[J].Journal of Chongqing University(Natural Science Edition),2008,31(8):918-921. |
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| Authors: | DENG Shao jiang PU Zhong liang and ZHANG Dai gu |
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| Institution: | (College of Computer , Chongqing University, Chongqing 400030);(College of Computer , Chongqing University, Chongqing 400030);(College of Computer , Chongqing University, Chongqing 400030) |
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| Abstract: | An algorithm was proposed in view of the combination of image compression and encryption.We got the approximate part and three detail parts after transforming the image with discrete wavelet transform(DWT),and compressed the image by modifying the detail parts by a given threshold value based on human visual systems.And then,we encrypted the image by scrambling the approximate part because this part held mostly of the energy.Last,a compressed and encrypted image can be achieved after DWT.Simulation result shows a good effect on the combination of compression and encryption. |
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| Keywords: | wavelet transform image compression chaotic scrambling encryption |
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