| With the wide application of digital cameras, and video resource sharing on websites, digital videos in our life become necessary. People are no longer limited to browse for pictures, but to get the true and real-time information. So, most of people will choose video as the way of accepting information. Besides, the former film had not already satisfied people’s needs. Therefore, the special effects and 3D technology in the production of the film are becoming more and more popular. However, the technology also brings the challenge of the video authority. For example, if the technology is used in the monitoring, it will do harm to the justice of the society.This paper based on digital video blind forensic technology research, digital blind forensic technology is based on video data itself to judge whether the video is tampered. This paper firstly introduces image and video digital blind forensic technology, and introduces the related tamper methods and tools. According to the main method in detecting composited videos, a new way based on edge features is introduced in this paper. A blue screen video technology is a kind of popular video synthesis technology, which is to extract the object from the pure background video, and then embed it into another video. Nowadays, there are different methods about detection of blue screen videos, such as modal noise, double compression, and edge features. Above all, this article is based on edge features to detect such composited videos.In the future discussion, it is first to observe that the difference between the normal and suspicious edge. Then, we use a variable to describe such a difference, and find out a reasonable threshold to decide whether an edge point is suspicious. However, in order to prove the video is composited, it is necessary to find the suspicious object in the video. Here, the percent of suspicious points could make sure the suspicious objects in videos. In the experiments, low bitrates and filters are used to prove the robustness of the algorithm, and the results are also good. |
