Abstract: Encryption is very important in image data transmission on Internet, but most of all encryption algorithms following the principle of dynamics of recession will be degraded into a cyclical algorithm, which leads to the leakage of image information and so on. Based on pseudo-random points, a mixed image fusion algorithm was presented. Firstly the image was divided into 8 × 8 small blocks, and then each block was transformed to create a pseudo-random sequence. The image block pixel values and their related pseudo-random sequence were fused and scrambled, and the image after EZW coding was scrambled again by chaotic sequence. Test results show that the algorithm has good security, and the algorithm is also relatively easy to achieve.

Key words: image fusion, permutation, pseudo-random sequence, chaos sequence, one-way function

摘要： 图像数据在网上传输需要经过加密处理，而现在很多加密算法都遵循动力学的衰退原理，会退化成具有周期性的算法，而会导致图像信息的泄漏等问题。提出一种基于伪随机点的混合图像融合算法，它先把图像分成8×8的小块，然后对每块图像进行变换，产生一个伪随机序列，将图像块内的像素值和按伪随机序列所对应的像素值相融合进行一次置乱，然后对EZW编码后的图像用混沌序列再一次置乱。试验结果表明，该算法具有很好的安全性，也比较容易实现。

关键词: 图像融合, 置乱, 伪随机序列, 混沌序列, 单向函数