An asymmetric watermarking algorithm based on motion velocity

In this paper, a novel compressed-domain watermarking approach based on motion velocity is proposed. Here the motion velocity is defined as the ration of motion vector and time interval of adjacent frames. An asymmetry watermark detecting algorithm is proposed, where input watermark is a two-value sequence and output watermark is a three-value sequence. The experiment result shows that this watermarking approach has great robustness, especially to video format transformation and bit rate change. This approach can apply to the copyright protection of digital video products in network environment.