Research On The Algorithm Of Video Digital Watermarking

The rapid development of computer and multimedia network has affected the authors'copyrights significantly. The digital watermarking technique appeared accordingly and has been regarded as a promising way to protect the copyright of digital products. The robust digital video watermarking techniques for video copyright protection and information hiding have been discussed.In the paper, we will research digital video watermarking based on copyright protection. Video Watermarking, compared with image watermarking, have their own attack methods, such as frame averaging, frame switching, frame deleting, which destroyed the time synchronization of video watermark. Applying the image watermarking algorithm directly to video has not take into account of the video characteristics. We present as a copyright protection method, a blind video watermarking technique based on video scene segmentation and 3D wavelet transform. First, a gray scale image as copyright sign is decomposed with different resolution and embedded in the corresponding resolution of the decomposed video. As the multi-resolution representation of the video is for spatial axis of each frame as well as the temporal axis of the video, it is convenient for watermark to be adapted to motion and motionless regions of the video and the spatial detail of each frame. The experimental results show that this technique has more visually recognizable information of copyright ownership. In addition, these results proved its robustness against several video degradations and watermarking attacks including frame dropping, frame averaging and loss compression.