| Summary: | 碩士 === 國立交通大學 === 資訊科學與工程研究所 === 95 === Nowadays, more and more surveillance videos are recorded to prevent crimes. Three methods for data hiding applications implemented on video surveillance systems are proposed. In the first method proposed for the purpose of searching videos for specified persons or motion objects, we extract features from motion parts of video frames and embed them in the frames to help later searches for frames which contain motion objects with similar features. In the second method proposed for keeping motion frames in safer video sections to prevent malicious tampering, we embed concerned motion frames together with specially-designed authentication signals into I-frames with background scenes. Modification or replacement of relevant motion frames can be checked via an authentication process and compensated by a frame recovery process. Finally, the third method is proposed to monitor car break-in events, in which a warning message of event time and the car plate number is sent wirelessly from an on-car computer to a surveillance system. The message is then embedded in relevant video frames. Such event frames can be retrieved later for inspection. Good experimental results prove the feasibility of the proposed methods.
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