Secure And Content Authentication Video Watermarking Algorithm Based On H.264

In recent years,with the popularity of computer network,PC machine and the popularity of video sharing website,the browsing of video information has become an indispensable part of people's entertainment.However,video editing tools makes the change of video content become easier and the video content which is changed cannot distinguish authenticity,which lead to the original author of video suffering the crisis of reputation and economic,even some adverse effects to society.Video watermarking is widely used in the field,in which the research of video watermarking based on copyright protection and content authentication has become an urgent problem to be solved.Video watermarking technology compared with traditional cryptography and signature technology,has higher security,so research in the direction of copyright protection and content authentication based on video watermarking algorithm by scholar of all ages.However,H.264 encoding standard is the mainstream encoding standards,therefore,this study of this paper is based on H.264 encoding standards.classified and summarized the existing video watermarking algorithm,then do some research on application of video watermarking in copyright protection and content authentication.The main research contents include two parts,are as follows:1.In terms of the poor security issue on existing video watermarking algorithm and combining with the features of the H.264 coding and decoding standard,a security of video watermarking algorithm in H.264 compressed domain is proposed.First,this algorithm needs to mark 16 sub blocks in a macro block;then choose the top 8 sub blocks according to Logistic chaotic sequence,the intra prediction mode,and edge property and classify them into two groups;finally,embed watermark information by energy difference between sub blocks.It uses Logistic chaotic sequence to scramble sub blocks in order to increases the difficulty for attacker to tamper watermark information and improve the security of this algorithm.The simulation experiment shows that this algorithm has higher security,better robustness and transparency.2.According to the algorithm which is about content authentication but not reversible has a great impact on video quality,so H.264/AVC reversible video watermarking algorithm based on content authentication is proposed.considering the human visual characteristics,First of all,the paper statistics the number of non zero quantized coefficients about current macro block which has16 4x4 subblocks.Secondly,according to the low frequency coefficients energy relation of the selected 15 4x4 subblocks generate a content authentication codes,then authentication codes as thewatermarking information is embedded into 4x4 subblock which has the largest non zero quantized coefficients.At the decoding position,first of all,decoding the coded video bitstream information and geting quantized DCT coefficients,then according to the energy relation of the current macro block DCT coefficients calculated authentication code and extract the watermark information.Finally,comparing whether the authentication code and watermark information bit position is consistent to complete the video data content authentication and tampered area positioning.After extracting the watermark information,the video data of the embedded authentication code can be restored to ensure that the video data is not affected by the watermark information.