基于扩频技术的DCT域图像水印算法  

Research on Image Watermarking Algorithm in DCT Domain Based on Spread Spectrum

作　　者：柏均[1] 

机构地区：[1]西安科技大学通信与信息工程学院,西安710054

出　　处：《煤炭技术》2011年第9期167-168,173,共3页Coal Technology

基　　金：陕西省自然科学基金项目(2007F04);陕西省教育厅专项基金项目(2008JK375);西安科技大学青年培育基金项目(200825)

摘　　要：数字水印技术是版权保护的重要手段。该文结合扩频技术,提出了一种新的DCT域数字图像水印算法。先对原始图像分块作DCT,再将二值水印图像置乱,最后用置乱后的水印信息控制2个m序列对原始图像子块DCT部分中频系数进行修改,实现水印的嵌入。分析及实验结果表明算法不可见性较好,对JPEG压缩、剪切、噪声、滤波等均有较好的鲁棒性。该算法可用于图像的版权保护。Digital watermarking technology is an important method of copyright protection.A new watermarking algorithm in DCT domain based on spread spectrum was proposed.the original image is processed by blocked DCT Firstly,then intermediate frequency coefficients are modified by two m-sequences under the control of permuted watermark.Analysis and experimental results show that the watermarks are invisible and robust against common attacks,such as JPEG compression,cut,noise-add,filter.it can be used to image copyright protection.

关 键 词：数字水印 扩频技术 DCT变换 

分 类 号：TN911.72[电子电信—通信与信息系统]