数字图像水印加密算法比较分析

Comparison and Analytical Research on Several Digital Image Watermark Encryption Algorithms

目前,数字水印的理论和应用随着信息技术的发展不断更新,已出现多种针对不同应用领域的数字水印技术。数字图像加入水印是数字水印研究的基础领域;而直接利用水印算法将水印图像嵌入原始图像会减弱水印的嵌入效果和安全性,因此,在嵌入水印图像前,对水印图像进行置乱加密预处理具有重要作用。通过试验对二值水印图像与灰度水印图像进行加密,比较分析各种常用的水印加密算法,分析加密算法原理,为水印信息加密的进一步研究提供理论依据。

At present, through the development of information technology, the theory and application of digital watermark are keeping update, and different digital watermark technologies for various areas have been created. Adding watermarks to digital images is one of the basic areas of digital watermark research ; however, using the watermark encryption algorithms directly to embed watermark image on original images will weaken its effect and security. Therefore, before embedding the watermark images, it＇s important to do a random encryption pretreatment for watermark images. It encrypts the binary watermark image and grayscale watermark image through experiments, comparing and analysing all the common watermark encryption algorithm, provides a theoretical basis for the further research of watermark message encryption.