A Semantic Watermarking Technique for Authenticating Video of H.264

A novel watermarking technique to authenticate video of H.264 is presented in this paper, using Uniform Content Locator (UCL) to semantically indexing video content and dual watermarks to preserve and enhance video content integrity and authentication. UCL index information is firstly extracted from video content and is formatted as semantic watermark to be embedded in video content. The UCL watermark is regarded as robust watermark and is then embedded into medium frequencies of DCT-coefficients of H.264 video I-frames in order to protect video attributes property (e.g., video author, copyright, content category). Features information obtained from the previously watermarked DCT-coefficients are treated as fragile watermark and are embedded into the motion vectors of H.264 video P-frames in order to ensure video secrecies (e.g., video integrity, authentication). Experiments demonstrate that this proposed technique can fulfill the requirements of H.264 video authentication and has negligible effects on video code rate change and content distortion.