【摘要】 数字水印是近年来出现的一种新的数字媒体产品版权保护技术,然而在实际应用情况下,带有水印的图像不可避免地会受到一些如图像滤波、图像增强、图像锐化和图像压缩等无意攻击及合谋攻击、混淆攻击、削去攻击等恶意攻击。数字图像水印的仿射变换攻击破坏水印检测器与水印信号的同步达到攻击的目的,是一种有效的水印攻击方法。利用图像指纹恢复经仿射变换的水印图像,使水印检测器与水印同步以达到有效检测水印的目的。实验表明,使用该方法能较好地恢复图像,有效地同步水印检测器与水印信号,从而使水印对仿射变换攻击具有鲁棒性。更多还原

【Abstract】 Digital watermarking is a new technique for digital multimedia copyright protection, however the watermarked images are unavoidably manipulated by malicious attackers (such as collusion attackers, removal attackers) or those who are unintentional to distort the watermark using various manipulation tools in real application situation. The affine transformation attack intends to distort the watermark detector synchronization with the embedded information (watermark) and is a very effective attack method to the watermark. A synchronization method based on image fingerprint is presented, so that the watermark detector can detect the watermark. The experiment result shows that the synchronization method can synchronize the detector with the watermark perfectly and that the watermark is robust to affine transformation attack.更多还原