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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/9697

    Title: 利用H.264/AVC特徵之多攝影機即時追蹤系統;Real-Time Multi-Camera Tracking by Exploiting Features of H.264/AVC
    Authors: 陳桂枝;Kuei-Chih Chen
    Contributors: 資訊工程研究所
    Keywords: 多攝影機;追蹤;H.264;H.264;tracking;real time;multi camera
    Date: 2009-01-08
    Issue Date: 2009-09-22 11:53:50 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 視訊監控在現今的生活中扮演著極為重要的角色,越來越多的監控攝影機被佈建於各個場合以協助保障人員或財產的安全。然而,大量的監控資料管理不易,負責監看畫面的管理人員注意力有限,監控的效能因而打了折扣。為了彌補人力監視與操作上的不足,我們提出使用多台PTZ(Pan-Tilt-Zoom)攝影機實現室內環境多角度自動化人物即時追蹤。透過多台攝影機之間的溝通,對目標人物持續且有效的追蹤,並透過多角度與變焦拍攝(zoom),讓管理人員獲得更清晰的視訊監控資訊。 本研究所提出之監控系統採用H.264/AVC 壓縮技術來處理視訊資料以利畫面資訊的傳輸與保存。為減低系統負擔以達成即時追蹤,我們利用H.264 編碼過程中所擷取之冗餘(residual)資訊,輔助PTZ攝影機在旋轉過程中,對出現在畫面中之移動人物作有效的偵測。對於單一移動人物,系統會以一台距離目標物較近之攝影機執行主要追蹤,同時以鄰近幾台攝影機配合施予多角度變焦輔助拍攝。實驗結果顯示,利用多台追蹤攝影機可減少目標物消失於監控畫面的情況,經由充分利用PTZ 攝影機的功能,可得到更清晰且多角度的監控畫面。 Visual surveillance systems have played a more and more important role these days to protect the safety and/or properties of people. In this research, we consider building a real-time multi-camera tracking system by using PTZ(Pan-Tilt-Zoom) cameras. Several PTZ cameras are deployed in an indoor environment to track a single walking person. Each PTZ camera can dynamically change its focus to have a better view of the tracked object so that the subsequent intelligent processing or understanding of the scene can be applied. Cameras can communicate with each other by exchanging simple messages via the wireless networking. The captured video will be compressed with the state-of-the-art video codec, H.264/AVC, to facilitate the video transmission and storage. In order to achieve the effective and real-time tracking, we make use of the residuals of H.264/AVC to detect the position and size of the moving object, especially when the PTZ camera is not in the still mode. The camera that is close to the object will apply the principal tracking while the nearby camera(s) may apply zooming-in on the walking person so that the system can have multiple views of the target. The experimental results show the feasibility of our proposed multi-camera tracking system as the cases of failures in tracking the moving object can be significantly reduced.
    Appears in Collections:[資訊工程研究所] 博碩士論文

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