改进基于均值运算的线性同余伪随机序列图像置乱算法研究

A Study on Improved Image Scrambling Algorithm by Linear Congruential Pseudorandom Sequence Based on Mean Operation

随着网络技术的迅猛发展,图像被作为一种数据信息频繁传输于世界各地的网络中。为了保证某些保密图像的安全性,提出了一种改进基于均值运算的线性同余伪随机序列图像置乱算法,先对通过均值运算获取的图像象素进行矩阵转换,将每个象素值从十进制转换成二进制,随后实现按位倒序,将其逐个转换成十进制数,最终实现对于图像的置乱。实验结果表明,该算法更加适用于图像文件的加密传输和秘密图像信息在数字水印技术中的置乱预处理,而且对图像的处理有良好的鲁棒性。

With the rapid development of network technology, image is frequently transferred as data information in network around the world. In order to ensure the security of some confidential images, this article introduces an improved image scrambling algorithm by linear congruential pseudorandom sequence based on mean operation, which firstly transforms the matrix of image pixel image produced by mean operation, and then from decimal to binary system for each pixel value and performs a bitwise sequence reversion which will be transformed to decimal system one by one afterwards so as to realize the image scrambling. It is shown by the test that this operation is more applicable to image files eneryption transmission and pre-process of scrambling of confidential image data in digital watermarking technology, which provides a good robustness for image processing.