基于DWT-SVD和DSP的数字图像加密算法实现

摘要

In order to solve the security problem of digital images in communication channel transmission, we propose a new digital image encryption algorithm based on DWT-SVD. Singular value of the image has good irreversibility against the geometric attacks, and after mathematical transformation, the image centroid will not change. Based on the above analyses, in this paper we dwell on the designing idea of the DWT-SVD algorithm, and present the implementation steps of the algorithm. The DWT-SVD algorithm could be implemented on the constructed platform of image processing system based on DSP, and through the experimental test we can find that the DWT-SVD algorithm could well fight against geometric attack in communication channel, thereby ensure the security, invisibility and robustness of the images transmitted in the channel.%针对数字图像在信道传输中存在的安全性问题,提出DWT-SVD数字图像加密算法.在分析奇异值对几何攻击具有良好的不变性,以及图像质心在交换前后具有一一对应关系的基础上,详细阐述DWT-SVD算法的设计思想,同时给出算法的实现步骤.在构建的DSP图像处理系统平台上进行算法的实现,并通过实验测试得出,DWT-SVD算法可以很好地抗击信道中的几何攻击,从而保证了图像在信道中传输的安全性、隐蔽性和鲁棒性.