一种新颖的彩色水印图像几何失真校正算法

An Efficient Geometric Distortions Correction Arithmetic for Color Image Digital Watermarking

几何攻击是制约水印技术实用性的重要因素,当图像经过旋转、缩放和DA转换等几何变换后,绝大多数水印算法的检测器将失效。该文提出一种新的基于计算机视觉理论的图像空域特征重同步算法,首次采用图像的corner中心角和corner中心距离对水印图像几何失真进行失真校正。实验证明,算法性能良好、校正精度高、可以有效地校正大强度几何失真。

Geometric distortions are critical factors which hamper the application of the image digital watermarking. While the image experienced the geometric transform such as resizing, rotation, DA translation, most of the watermarking technique would failed. In this paper a novel geometric distortions correction schema for image is proposed, it takes the advantage of the comer center angle and comer certer distance firstly to acquire geometric distortions correction. The experiments demonstrate that this schema has good performance, sound correction precision, and can correct high intensity geometric distortions.