Research On Robust Video Watermarking Algorithm Based On H.264/AVC Error Compensation

Digital watermarking is one of the most important banches of the information-hiden technlogy.Which is the study of how to embed watermarking information without destroying the value of the digital carrier,and it is difficult to be detected.Because of its robustness,invisibility and other characteristics.Digital watermarking technlogy has become a synonym for the current protection of information security.In recent years,H.264 / AVC has been widely used in digital media with its advantages of low bit rate,high quality,high adaptability and other advantages.This brings a great challenge to the digital watermarking technology,and the research of video watermarking based on H.264/AVC coding standard will be a new and challenging subject.In view of the existing video watermarking algorithm based on H.264/AVC has error drift problem,the paper analyzes the system based on the error drift reason,we propose a way to inhibit the robust video watermarking algorithm error drift.The last row of the DCT subblock modulation algorithm H.264 / AVC coded I frame 4 × 4 DCT matrix is quantized residual coefficients to watermark embedding,and specific conditions are met after the intraframe prediction quantization,column and compensation inter prediction compensate effectively inhibit intra,inter error drift.In addition,the algorithm combines CAVLC residual coding modulation DCT coefficients after quantization,so that changes in the overall stream is small,and the algorithm can adaptively adjust the embedding capacity and embedding position according to different video sequences,it has good flexibility and Lu stick properties.At the same time the extraction does not require carriers to participate in the original video,which is very well blind extraction.The simulation results show that the algorithm has good invisibility under the precondition of compression rate less impact,better able to resist noise,frame cropping,re-encoding and other attacks.On the original basis,a kind of robust video watermarking algorithm eliminate drift error completely was proposed.Through the modulation of I-frame quantization of 4×4 DCT coefficients,and strictly to ensure the embedding error matrix at the end of the low and the last column were zero at the same time,thus can completely eliminate the intra frame error drift.At the same time,the algorithm made a good use of the texture masking properties of human visual system to select the texture complex area for watermark embedding.Firstly,according to Weber's law,the texture block is determined as the embedding area,and then the watermark information is embedded in the final texture block according to the corresponding conditions.In this chapter,the correctness of the algorithm is proved theoretically and experimentally,and the validity of the algorithm is verified by experiments.