标题：Blind video watermarking scheme based on direct current component in discrete cosine transformation domain
作者：Liu, Lianshan ;Li, Renhou
作者机构：[Liu, Lianshan ;Li, Renhou ] Institute of System Engineering, Xi'an Jiaotong University, Xi'an 710049, China;[Liu, Lianshan ] College of Information S 更多
来源：Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
摘要：By using the stability of the direct current (DC) coefficient in the blocks of discrete cosine transformation (DCT), the blind video watermarking method of modulating the DCT-blocked DC coefficients to hide the watermark was proposed. Firstly, the random selected video frames are partitioned into blocks with size 8 × 8, and the blocks embedding the watermark are selected by the mask matrix. Then every selected block is further divided into four non-lapped blocks with size 4 × 4. Finally, the watermark is hidden by modulating the DC coefficients of the four non-lapped blocks. The watermark is spread before it is embedded in order to increase the robustness. Experimental results demonstrate that the proposed method is computationally simple, and robust against the intentional or non-intentional attacks such as zooming, deleting frames, multiple compression, transition of compression standard, collusion attack, and deleting rows or columns. The correlation values between the original watermark and the extracted watermarks from I, P, B pictures are 0.9961, 0.9961 and 0.9863 respectively when the MPEG-2 compression bit rate is 4 Mb/s.