The Research For Anti-geometric Attacks Watermarking Based On Pseudo-zernike Moment

With the rapid development of multimedia and Internet techniques,the digital works security becomes an important and challenging research topic.Digital watermarking technique is an effective method for digital copyright protection and becomes an important research area in the field of information hiding.Now most of watermarking schemes are robust to common signal processing,but they are difficult to resist the geometric attacks such as rotation,scale and shearing.So how to resist to geometric attacks is still a challenge.This paper researches on anti-geometric attacks based on digital image.Based on normalization of pseudo-Zernike moment,an anti-geometric attacks image waterking scheme is proposed. Firstly,the pseudo-Zernike moments of the host image were computed.Secondly,normalized the result.At last,the digital watermark were embedded into the host image by quantizing some low-lever moments.Experimental results show this scheme is invisible and robust against scaling attack .Present an anti-geometric attacks image waterking scheme based on SIFT and normalization of pseudo-Zernike moment.Firstly,detect image feature points by SIFT and select some suitable ones to be keypoints.Second, determine square sub-regions of host image using keypoints.After computing these regions by pseudo-Zernike moments,normalizing the moments,and quantizing some low-lever moments,the digital watermark are embedded into the host image.Experimental results show this scheme is robust against the shearing,JPEG compression,noise and filtering attack.