摘要
水印的透明性与鲁棒性是一对矛盾。在鲁棒性不变的情况下,尽量减少图像的修改量,使含水印图像的透明度得到提高,确保水印算法的安全性。提出基于差分进化算法(DE)来改进SVD水印算法的透明度。通过DE算法获得的最佳值,来弥补图像在SVD嵌入水印后造成的视觉损失。实验表明,在嵌入强度相同的条件下,水印算法的透明度有了进一步的提高。
Watermark transparency and robustness contradicts against each other.On the one hand the robustness ought to be kept unchanged,on the other hand modifications to the image ought to be minimised in order to raise the transparency of the watermarked image,so that the safety of the watermarking algorithm is ensured.The paper proposes an improved differential evolution algorithm to ameliorate the transparency of SVD watermarking algorithm.DE algorithm can figure out an optimal value to remedy the vision losses caused by the SVD embedding watermark.Experiment results indicate that when imposed by the same embedding strengths,the proposed algorithm can enhance the watermarking transparency.
出处
《计算机应用与软件》
CSCD
2011年第7期277-280,共4页
Computer Applications and Software
关键词
水印
奇异值分解
差分进化算法
透明性
Warkmark SVD Differential evolution algorithm Transparency
