Then a new filtering method was utilized to invert the translation effect in the image rotation and scaling, which used a small portion of the original image to calculate the translation positions.

• 为计算和校正旋转及缩放造成水印位置的移动，采用一种新的滤波方法。该滤波方法需要使用原始图像时数极坐标域中的一小方块信息来计算水印位置的平移。