鲁棒性数字图像水印算法研究

为了有效保护多媒体信息的版权，研究利用离散余弦变换的算法对整个数字水印图像进行数字变换，将水印加栽在中低频分量上以保护原多媒体信息，对数字水印图像的嵌入、提取和攻击进行鲁棒性测试，试验表明该方法不仅可以从攻击后的图像中完整提取水印，而且水印的鲁棒性及抗攻击性较好，可经受一定程度的有损信号处理和一般的数字几何变换，有较强的推广价值．

Algorithm Research on Robust Digital Image Watermark

In order to protect the copyright of the multi-media information effectively, this paper proposes a digital watermark algorithm based on DCT. The watermark is embedded in the medium and low frequency part of the host image to protect the original multi-media information, and the robust tests on the embedding, extracting and attack of digital watermark are made. The test results show that watermark can be completely extracted even after the attack, and the robustness and anti-attack ability of the watermark can be better achieved which can bear some signal distortion and geometric distortion. This algorithm has higher popularization value.