A Blind Watermarking Method in H.264 Compressed Domain

In this paper, a new blind video watermarking scheme in H.264 compressed domain is proposed based on the existing video watermarking schemes and combing with the new characteristics of H.264 coding standard. The submacroblocks of I4 which have more nonzero quantized coefficients are chosen as embedding locations. The watermark is embedded into video sequence by modifying the number of nonzero (NNZ) quantized coefficients of I frames on the basis of the probability matrix which is defined according to the distribution characteristics of DCT coefficients. The simulation results show that the proposed method can prevent bit-rate increase and improve embedding capacity without sacrificing perceptual quality. On the other hand, it is not necessary to fully decode the compressed video in extracting process, and this method can also meet the requirements of real-timing and blind detection.