几何变换攻击下数字水印的同步检测方法

对数字水印系统在几何变换攻击下的同步方案进行了分析，提出了一种新的同步检测方法——同步水印追踪方法(SWTM)。与传统方法相比，该方法无需对几何攻击后的载体图像进行二次处理，因此减少了水印信息的进一步丢失；而通过对剩余水印信息进行追踪，可最大限度地提取剩余的水印信息。仿真实验结果表明，该方法能够有效提高几何变换攻击下水印检测的有效性。

Synchronized Detection of Watermarking under Geometric Attack

Watermarking synchronization under geometric attack is studied. A novel scheme called synchronized watermark tracing method (SWTM) is proposed. Compared to traditional methods, SWTM can greatly reduce further loss of watermark information within the host image by avoiding further processing on the watermarked image. Instead, it can extract most of the left watermark information by tracing it in the attacked image. Simulation results show that this method can enhance the validity of the watermarking system under various geometric attacks.