线性同余伪随机发生器在数字图像置乱中的应用研究

Application Research of Linear Congruential Pseudo Random Number Generator in Digital Image Scrambling

本文提出了一种新的数字图像置乱算法,采用线性同余伪随机数发生器技术,根据RGB图像像素值的特性,计算出LCG迭代公式中m的值及其原根a,并通过实验得出置乱的最小正周期T。结果表明,该算法置乱效果显著,作为图像隐藏的预处理和后期处理是一种良好的方法。

A new scrambling algorithm of digital image based on the technology of linear congruential pseudo random number generator is proposed in the paper. According to the character of ROB image, m＂and origi- nal root ＂a＂ of LCG are calculated, and that the least period ＂T＂ of scrambling is finded in the experiment. The result proved that the scrambling effect is very good in the algorithm, and more the algorithm is a good method in preceding and finally process of image hiding.