Survey on Watermarking Against Geometric Attack
图像水印抗几何攻击研究综述

Robustness is the key issue of digital watermarking technology. Up to now, various watermarking algorithms are proposed with much emphasis on the "robustness". However, the "robustness" claimed in most of algorithms is only against common signal processing operations such as compression and signal filtering. It is now clear that even very small geometric distortions can prevent the detection of a watermark. In this paper the current methods against geometric attacks are analyzed and summarized, and some probable development directions of digital watermarking at next stage are introduced which are the key issues to improve and design watermarking algorithms.