一种快速有效的水印图像几何失真校正算法

A Fast and Efficient Geometric Distortions Correction Algorithm for Image Digital Watermarking

为解决水印图像在受到几何攻击后水印无法被有效检测的问题,利用图像的空域不变信息实现对水印图像几何失真的校正,提出一种快速有效的水印图像重同步算法,算法能够有效校正水印图像的旋转失真和放缩失真。实验证明,算法性能良好。

There existed a big problem in the digital watermarking technique, that was digital watermark could not be detected while the image was attacked by geometric method such as scaling, rotation.This problem hampered the practical application of the digital watermarking. In order to solve this problem a new arithmetic is proposed. The arithmetic takes the advantage of the attribute of image to recover the attacked digital watermarking image.The attribute of original image corner and the attribute of attacked image corner were utilized to traced the geometric distortions of the attacked digital image watermarking. By this means, the digital watermarking image is resynchronized and the watermarking is detected again. The experiments have demonstrated that this schema has good performance, sound correction precision. It can correct scaling distortion and rotation distortions exactly.