New real-time watermarking algorithm for compressed video in VLC domain

As a main method for copyright protection of digital video data, video watermarking has been proposed and investigated. However, unlike still image, video watermarking technology must meet the real-time requirement. In this paper a new real-time watermarking, differential number watermarking (DNW), which can be directly performed in the VLC domain, will be proposed. The label bits are embedded in a pattern of number differences between two subregions by selectively removing high frequency components. The DNW algorithm has only half the complexity of other VLC domain watermarking algorithms. And comparing with the DEW algorithm, it doesn´t need quantization step. The experimental results show that the DNW algorithm performs better on watermark´s visual quality impact, capacity and robustness than the DEW algorithm.