New scheme of video watermark by combining harris detection and affine transform
Jing Li · Journal of North China Electric Power University · 2011
The geometric attack and temporal attack are two common attacks to video watermarks.Recent watermarks can resist only one kind of attack,to solve this problem,a scheme that can resist two kinds of attacks was proposed.Firstly,the geometric features points of video frames were extracted by Harris detection which has good performance against geometric attacks.Then watermark composed of information part and symbol part was embedded into DCT coefficients of luminance component of the video.In the embedding process,segmentation technique was also adopted.To extract the watermark,the geometric attacks were rectified with the aid of geometric features points of the frames and affine transformation,and the frames with watermark were found by detecting the symbol watermark.Experimental results show that the watermark is invisible and the scheme is robust to geometric attack and temporal attack.