旋转、缩放、位移不变的小波域图像水印算法

介绍了一种基本上不受旋转、缩放、位移影响的小波域图像水印算法.该算法根据人类视觉系统的特性,将水印自适应地嵌入图像小波域的低频子带.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对数极坐标域中的一小方块信息来计算水印位置的平移.实验结果表明,该水印对旋转、缩放、平移和常规的图像处理具有较强的鲁棒性.

Rotation, scaling, and translation invariant digital image watermarking in DWT domain

A new digital image watermarking scheme that was invariant to RST in discrete wavelet transform (DWT) domain was proposed. Firstly, a watermark was embedded in low band of DWT domain according to the conceal quality of human visual system (HVS). 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. The experimental results show that the watermark is invariant to RST and general image processing techniques.