置换DCT域中频系数的盲水印嵌入算法研究*

介绍了一种基于离散余弦变换域(DCT)中频系数置换的盲水印算法,用该算法对数字水印进行了自适应嵌入方法研究.该算法突破了数字水印的加性算法、乘性算法等传统的水印嵌入方法;解决了被提取水印中含有原始图像DCT系数从而影响水印检测准确性的问题.该算法使用人类视觉模型对水印图像进行自适应嵌入,使嵌入的数字水印从根本上不可逆.实验证明该算法对数字水印的滤波、剪切、噪声等攻击有很强的鲁棒性.

Research on Blind Watermarking Embedding Algorithm with Replacing Middle Frequency Coefficients in DCT Domain

This paper proposed a blind watermarking algorithm based on replacing the middle frequency coefficients in DCT domain,and researched the self-adaptive embedding method of digital watermarking by employing the algorithm.This algorithm pierced into the traditional watermarking embedding algorithms,such as additive algorithm and multiplicative algorithm,which solved the problem that the detection accuracy becomes lower because the DCT coefficients of the original image exist in the extracted watermark.Moreover,the watermark was self-adaptively embedded in image using HVS,and the embedded digital watermarking is not inverse radically.The experiments prove the strong robustness against the attacks such as filtering,cropping and adding noise.