| Summary: | 碩士 === 國立東華大學 === 資訊工程學系 === 94 === As digital videos become more and more popular nowadays, the application of videos in different fields has been wide spreading. The researches had turned from simply getting the shots to using techniques like abstraction, summarization to display the exciting performances in the clips; or even increasing audio techniques to let users listen to music while watching the films. However, among these developments, the filming still relies on only one video camera. When filming, it makes it impossible to catch the performance and a close-up on the performers at the same time. Therefore, using multiple video cameras to film can achieve the expectations of letting the users capture bounteous contents and close-ups.
The thesis takes multi-view based video as the foundation to build up the automatic video editing system. There are two important issues for video composition: video synchronization and video switching. Video synchronization is to match the time of the videos from different viewing directions to the global time axis. The system firstly uses abrupt video shot detection to segment the abrupt shots of the captured videos, and then uses the velocity curve similarity to search the synchro-point. The goal of video switching is to retrieve different contents of videos to appeal the users and allow them to watch the attention shots of videos. We designed three shots that based on the contents for the system, and we categorized these three shots in considering the parts that users will take notice of on videos, for example: camera motion shot, face shot, and fragment shot; we calculate the importance of each shot to determine whether those shots should be selected into the compositive film or not.
The experiments uses ball games as the filming content, and they contain the conditions of the different viewing angles, different content based shot weighting, the environmental change of indoors and outdoors, and the filming of a lot of people. Also, we analyze the synchronization of the film and the importance of the shots in different circumstances.
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