一种基于混沌理论的图像Hash算法  

An Image Hash Algorithm Based on Chaos Theory

作　　者：于海鹏[1] 文政颖[1] 

机构地区：[1]河南工程学院计算机科学与工程系,郑州451191

出　　处：《重庆师范大学学报（自然科学版）》2013年第3期99-102,共4页Journal of Chongqing Normal University:Natural Science

基　　金：河南省科技计划项目(No.122300410174)

摘　　要：为了对数字图像进行快速有效的认证,提出了基于混沌理论的对数字图像进行认证的Hash算法。首先提出了按块对图像进行量化的思想,构造出图像矩阵,采用了混沌理论的Logistic映射方法,对图像矩阵进行置乱得到置乱矩阵,然后构造出差值矩阵,使用N次混浊调制生成调制矩阵,对调制矩阵进行二值化量化得到1bit的Hash序列,通过多次调制和量化从而得到图像的Hash序列。仿真实验结果表明,算法能够有效认证数字图像,同时对于图像的缩放认证,算法也表现出较好的性能。Hash algorithm for digital image authentication based on chaos theory. For beginning, the paper proposed the idea of con structing the image matrix from the quantifying image blocks, and used the chaos theory of logistic mapping method to make a scrambling matrix. Then, the differential matrix can gain from the scrambling matrix and image matrix. A modulated matrix gener ated by N turbidity modulator and one bit Hash sequence received from the binarization of the modulated matrix. Then an image se quence Hash obtained through multiple modulation and quantization. Finally, the algorithm is validated by simulation experiment, and the results show that the algorithm was effectively and powerful, it＇ s also certificated for the image scaling.

关 键 词：图像认证 混沌理论 LOGISTIC映射 图像HASH 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置] O415.5[自动化与计算机技术—控制科学与工程]