【摘要】 根据二维工程图的特点提出了一种简单的零水印算法。该算法将直线段的长度和二值水印信息转换为复数,并保存两个复数在复平面上的关系作为特征数据,检验时先对目标工程图的直线长度做同步处理,再结合特征数据提取水印。实验结果表明,该算法对均匀缩放、旋转、平移等几何攻击以及增添攻击具有完全的健壮性;对于删除攻击具有很强的健壮性。更多还原

【Abstract】 A null-watermark algorithm is presented according to the characteristics of two-dimensional engineering graphics. Straight line length and binary watermark is converted to plural number,and save the relationships between two plural number in the complex plane as the feature data. While detecting straight line length is synchronized on target engineering graphics,which is combined with the feature data to extract watermark. This algorithm is fully robust against the increase attacks and geometric attacks such as translation,rotation,equal scaling and so on;and is strongly robust against remove attacks,which is illustrated by the result of the experiment.更多还原