基于DCT的自适应图像盲水印算法  

Oblivious adaptive image watermarking scheme based on DCT

作　　者：崔东峰[1] 王相海[1] 

机构地区：[1]辽宁师范大学计算机与信息技术学院,辽宁大连116029

出　　处：《计算机工程与设计》2007年第6期1355-1357,共3页Computer Engineering and Design

基　　金：国家自然科学基金项目(60372071);辽宁省自然基金项目(20032105);辽宁省高等学校优秀人才支持计划基金项目(RC-04-11)

摘　　要：数字水印技术是多媒体信息安全领域的一个重要的研究课题。提出了一种基于DCT域的盲水印算法,该算法将图像经DCT变换后进行8×8分块,然后将二值水印嵌入到每一个图像分块的中频系数中。在嵌入过程中利用每一块的中频系数的性质,自适应的确定嵌入强度,从而保证了所嵌入的水印对一些常用的图像处理操作具有很强的鲁棒性。实验结果验证了提出方法的有效性。Digital watermark technique is one of the most active research topics in the safety field of multimedia information. A novel oblivious image watermarking algorithm based on DCT is proposed. The host gray-level image is firstly DCT transformed, and divided into 8x 8 blocks. Then the binary watermarking is embedded into the coefficients of the middle fi＇equency band of each block. During the above process, the strength of the watermarking is quantized adaptively according to the characteristics of the embedded coefficients of each block. The algorithm has very strong robustness for some common image processing operations. Simulation results show it is effective.

关 键 词：数字水印 自适应 鲁棒性 DCT 中频 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]