The Research Of Video Watermarking Algorithm In The Covert Communication

In the recent years, information hiding techniques have been rapidly developed as a new generation of information security technology and have played an increasingly important role in the field of secure communication.Video watermarking is a most important branch in the field of hidden information.In this paper, I have done a large number of researches in the creative fields of the video secret communications and video watermarking against attack. The work is as follows:1. In frame-based video watermarking scheme, proposing the improved algorithms about the DCT algorithm and the LSB algorithm, changing the original picture watermark information into the form of bit stream. In the results, the improving LSB algorithm has a maximum information capacity, but has a less robustness; the improving DCT algorithm has a good robustness and smaller information capacity.2. Introduce the principles of video codec and the composition of video stream and find a universal applicable in MPEG video decompression method and lens segmentation and achieve it in the matlab platforms. In the methods of MSE,PSRN and entropy, the frame including the biggest changing curve is the key frame. The experimental results show that the entropy is the highest accuracy and the EMS is the strongest real-time.3. Firstly, embed the watermark information in the key frames making use of the LSB and DCT improving algorithms; secondly, compress the video in the MPEG coding and restore it; finally, detect the watermark information in the original key-frame is right or not. After a large number of experiments, the results show that the method which combinates the method of three types of key frame extraction and video watermarking algorithm can resist MPEG-2 interframe compression attack.