一种基于DCT中频的数字水印算法

随着Internet 和多媒体技术的发展,数字水印在数字产品的版权保护、安全传输和保密通信等方面有巨大应用前景.提出了一种新的选取嵌入水印块的方法,即根据宿主图像的纹理复杂度选取复杂度高的那些块作为嵌入水印的地方;然后利用置乱的方法将水印嵌入到这些子块的DCT中频分量中.实验结果表明,该算法具有较好的安全性和鲁棒性.

A Digital Watermarking Algorithm Based on DCT Middle Frequency

With the development of Internet and multimedia technology, the digital watermarking has already been widely used in copyright protection,secure transmission and confidential communication. In this paper, a new technique is proposed to choose parts of the image to embed watermarking, which chooses relatively complex parts of the image to embed watermarking in light of the complication of the original image.Then watermarking is embedded in light of stochast sequence in DCT middle frequency of those parts by scrambling. Experimental results demonstrate that the watermarking is invisible and robust against common image compression and noise.