利用資訊隱藏技術對 H.264 影片做真偽驗證及內容保護之研究

Abstract

隨著視訊壓縮及視訊編碼技術的進步，數位影片逐漸在我們的生活中扮演重要角色。本論文針對 H.264 影片，利用資訊隱藏技術，做影片快速檢索、驗證及隱私權保護之研究與應用。在影片快速檢索部份，為了在視訊監控影片中快速搜尋特定的可疑人物，我們提出了一個利用 H.264 編碼特性對影片做快速檢索的方法。在驗證方面，因為視訊監控影片經常成為不法使用者竄改掩蓋犯罪事實的對象，所以我們利用資訊隱藏技術及 H.264 特性提出了一個對影片做完整性及真實性的驗證的方法。在隱私權保護部份，因為視訊監控影片近來在個人隱私權方面經常引起爭議，所以我們提出了一個可將侵犯隱私權的影片部份內容消除及復原的方法。最後我們提出了一些相關的實驗結果，證明了所提方法的可行性。

With the progress of video compression technology and efficient video coding standards, digital videos nowadays have become much more popular than in the past, especially H.264 encoded videos. In this study, we propose methods for video-content search, video authentication, and privacy protection using H.264 videos as cover media. For video-content search, in order to find suspicious people or objects quickly in surveillance videos, a method for quick video-content search by novel uses of H.264 coding features is proposed. Because surveillance videos usually contain suspicious or unlawful acts, malicious users may tamper with videos for misrepresentation. Therefore, we propose a method for authentication of surveillance videos to protect and authenticate video contents. Privacy protection is also an important issue in video surveillance. Since surveillance videos may possibly record some personal information which violates personal privacy, we propose a method for removing and recovering privacy information in H.264 surveillance videos. Good experimental results show the feasibility of the proposed methods.