在MPEG-4視訊上做資訊隱藏之研究及其在版權保護及安全監控上之應用

Abstract

隨著多媒體科技與計算機網路的快速發展，越來越多的多媒體資料利用網際網路傳輸。本論文針對MPEG-4視訊檔案利用資訊隱藏及數位浮水印技術做版權保護、驗證及資料連結之研究與應用。在版權保護方面，我們提出一個利用主動式可視浮水印技術及限制影片播放次數的方法對被下載到客戶端的MPEG-4視訊檔案做直接性的版權保護。在視訊驗證方面，我們利用資訊隱藏的技術針對監控視訊檔案作完整性與真實性的驗證，因為監控視訊檔案裡可能會出現有嫌疑或犯罪的行為，經常成為非法使用者惡意破壞或修改的對象。在資料連結方面，我們提出一個有效率的搜尋方法在監控視訊檔案中找出可疑的動作或是特定的人物，藉由資訊隱藏的技術在視訊檔案裡藏進索引資料。最後我們提出了相關的實驗結果證明了所提方法之可行性。

With the advance of multimedia technologies and the popularity of computer networks, more and more multimedia data, especially digital videos, are transmitted through the Internet quickly. In this study, several methods for information hiding applications, namely, copyright protection, authentication, and data association, are proposed using MPEG-4 videos as cover media. For copyright protection, in order to protect the ownership of downloaded videos at the client site, a method using an active visible watermarking technique and limiting video play counts is proposed. Due to the insecurity of transmitting data on the Internet, receivers cannot make sure that digital videos received from the Internet are authentic. Therefore, an authentication method for verifying the integrity and fidelity of MPEG-4 videos, especially of surveillance videos, is proposed next. Because a surveillance video might contain scene frames including suspicious or criminal acts, malicious users might tamper with it for misrepresentation. Therefore, an effective method for searching a surveillance video for infrequent motions or specific events using an information hiding technique is proposed finally. Good experimental results show the feasibility of the proposed methods.