小波变换在数字图像加密中的应用

给出了一种基于小波变换的快速图像加密算法.首先对秘密图像和公开图像分别进行时域上的置乱变换,其次对公开图像的置乱图像进行小波变换,对小波变换后系数与秘密图像进行异或exclusive OR,XOR运算,最后利用小波逆变换进行图像重构,从而得到结果图像.数值试验表明该方法的加密能力较大,并保证了很好的视觉质量,且算法简单易行.

The Application of Image Encryption Based on Wavelet Transform

This paper proposes an image hiding algorithm based on wavelet transformation. Firstly,the serect image and the opened image is scrambled; Secondly, the scrambled image of the opened image is decomposed into low-frequency and high-frequency images,then the wavelet coefficients are calculated,the image data are processed byte by byte with the XOR operation, and the fusion image is got by inverse wavelet transform; Finally, the performance of the fusion algorithm is evaluated and analysed. The experimental results show that the proposed method can embed a large amount of secret information while keeping a very high visual quality.