Abstract: A video watermarking scheme based on block-DCT is presented. The watermark is embedded in the current coefficient of block-DCT. For the geometric and frame attacks are commonly ones in the practical environment, we use the sum of the current coefficients as the embedded feature which will not change with the distortions, and a synchronization code is used to complete the synchronization. The simulation results show that the method can efficiently resist geometric attacks, and is robust to the frame attacks.

Key words: DCT, data watermarking, geometric attack, frame attack