基于模板匹配的抗几何攻击图像数字水印

数字水印技术是解决数字化时代数字作品版权保护的一个重要手段，衡量数字水印技术先进可靠的标准是能否抵抗各种水印攻击，图像水印的抗几何攻击一直是图像数字水印技术的研究热点，并且远没有达到实际应用的要求，本文提出了基于模板匹配抗几何攻击图像数字水印技术，该技术向图像中嵌入两种水印：模板水印和鲁棒水印，模板水印用来检测图像所经历的几何变换；鲁棒水印用来标识作品的著作权，以作为版权纠纷的证据，对于有版权纠纷的作品，先进行模板水印搜索，测量出图像所经历的几何变换，之后再提取鲁棒水印，区域水印嵌入方法的提出，进一步提高了水印检测的准确性，试验表明该技术能够很好地抵抗诸如旋转、缩放、剪切和平移等几何攻击以及JPEG有损压缩。

Geometrical Attack Resistant Digital Image Watermarking Based on Template Searching

For a given disputed digital image, template watermark searching is first implemented to determine the geometrical transformation an image goes through, and then extract the robust watermark. A regional watermarking embedding technique is also proposed to further improve the extracting precision. Experiments demonstrate that the technique can well withstand such geometrical attacks as rotation, scaling, shearing and translation, and JPEG lossy compression.