摘要
DCT变换是当前JPEG压缩中所使用的一个处理过程,它能把图像的能量集中到左上角的低频系数上,该文利用这个特点有效地实现了水印的鲁棒性与透明性的平衡。此外,为了进一步提高水印的鲁棒性与安全性,该算法有机地结合了重采样置乱和混沌加密等方法对水印信息进行加密预处理。实验表明,该算法高效、安全性能好,且具有较好的不可感知性,对常见的图像处理及剪切攻击等具有较好的鲁棒性。
DCT is the transform adopted in JPEG standard, which make signal energy concentrated in DC and several low frequency AC coefficients. Watermarking in DCT domain is easy to be robust and invisible. To improve the robustness and security of the scheme, this paper also propose to use re-sample scrambling and chaos encrypting as preprocessing during watermark embedding. Experimental results show that the proposed scheme has good performance of computing efficiency , security, imperceptibility , highly good robustness to common image processing operation and the clipping attack.
出处
《计算机安全》
2007年第11期19-22,共4页
Network & Computer Security
