一种基于时间戳的DCT域零水印方案

A DCT-Domain Zero-Watermark Scheme Based on Time Stamping

提出了一种新的基于时间戳的DCT域图像零水印方案。原始图像进行分块DCT变换后,选取DCT域低频系数作为重要特征,通过混沌置乱与逻辑运算生成零水印,并为生成的零水印加盖时间戳以防止攻击者通过伪造零水印信息来混淆作品版权。在检测过程中利用原始图像几何矩进行水印的二次检测,有效地提高了零水印算法抗攻击能力。实验结果表明,该方案能很好地抵抗JPEG压缩,叠加噪声,裁剪,旋转等攻击,具有较好的可行性和安全性,能很好地实现版权保护功能。

A kind of zero- watermarking scheme in DCT domain based on time stamp is proposcd. The core idea of this scheme is： firstly, select the low frequencies of the DCT domain as important feature to generate zero- watermark by logistic operation arid chaos scrambling, then take advantage of time stamp mechanism to prevent the attacker from forging watermark information. Qnadric- detecting is adopted by using the geometric moment of the original image,which has greatly improved the capability of the method to resist attacking. Experiment results show this scheme is robust against some ttsual attacks such as JPEG compression, adding noise, cropping and rotation and so on. This scheme is proved of high feasibility and security and can be used for copyright protection.