摘要： 数字水印技术作为数字多媒体版权保护的有效方法,近年来在国内外引起了广泛的关注。本文提出了一种基于DCT域图像水印新算法。该算法利用密钥生成两个独立的随机序列,根据二值水印图像比特位是0还是1,来决定此DCT块的候选系数上嵌入对应的随机序列。本算法具有密码学意义下的安全性。利用人类视觉系统(HVS)的特性,将水印嵌入到宿主图像的DCT域的中频分量中,大量实验结果证明了该算法具有计算简单、抗噪声干扰、抗JPEG压缩能力强等良好性能。

关键词: 数字水印, DCT, 中频系数

Abstract: Digital watermarking techniques that have been considered as an effective solution to protect the copyright of multimedia data draw extensive attentions home and abroad . In this paper, a digital watermarking algorithm based on DCT domain is proposed. The algorithm generates two independent random sequences by means of the key and whether embedding watermarking on DCT-block according to the corresponding relation between the sequence and every DCT-block. So it is secure under the science of key. Then, by exploiting the characteristics of human visual system to embed the watermarking into middle frequency coefficients of DCT domain original image. Experimental results demonstrate that the algorithm calculates easily and is robust to addition of niose,JPEG compression ,sharpen,and so on .

中图分类号: 

• TP391.41