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

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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:	[Graduate Institute of Computer Science and Information Engineering] Electronic Thesis & Dissertation

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