摘要
为提高水印算法的鲁棒性,提出小波域水印图像重复嵌入算法。将水印变换域各层次系数反复嵌入到原始图像变换域的相应分辨率层的不同位置中,由于同一分辨率层的数据比较接近,增大水印嵌入强度不影响水印图像的不可见性,提高了水印的鲁棒性。讨论了算法的不可见性、抗噪性、抗剪切性等性能,针对小波域重复嵌入算法抗剪切性能差的问题做了进一步改进,采用不同的水印提取方案来抵御剪切攻击。仿真实验结果证明,该改进的水印提取算法的抗剪切性能有所提高。
In order to improve the robustness of watermark algorithm,we propose a repetitive embedding watermark algorithm in DWT,in which each layer coefficients of digital watermark are repetitively embedded into different locations of the corresponding resolution layer in the original image transform domain.As the data in the same resolution layer is close to each other,the increase of the embedding strength does not influence the invisibility of watermark image,so the robustness of the watermark is improved.In this paper,we discuss performances of the algorithm such as the invisibility,noise resisting and crop resisting ability.To improve the crop resisting ability,we apply the different watermark extractions to resist the cropping attack.Simulation results show that the algorithm is feasible.
出处
《长春工业大学学报》
CAS
2011年第1期52-56,共5页
Journal of Changchun University of Technology
