室內即時監控系統

Abstract

本研究使用二台PTZ網路攝影機來自動偵測以及追蹤進入監控環境為室內的目標。使用雙PTZ攝影機的室內即時監控系統的優點在於攝影機的功能能夠彼此交換。其中一台攝影機用於定位，主要負責偵測出監控環境內的目標位置。另外一台攝影機用於特寫及追蹤，主要負責對目標進行臉部的特寫並進行影像的儲存。對監控系統而言，儘可能的擷取出進入者的臉部影像非常重要，特別是在發生危險事件後，此影像利於人工對進入者進行辨識或是系統自動辨識皆可。由於進入監控環境的人可在監控環境內任意移動，因此使用二台可交換功能的攝影機系統能讓攝影機更容易得到適合辨識臉部的照片。此外，3D空間的追蹤能幫助我們分析進入者的行為，包括進入者進入的時間以及在監控環境內移動的位置狀況等。我們相亯利用攝影機間功能的交換性，可以增加完成這些監控系統要求的可能性。因此本研究提出了一種攝影機功能交換區域的方法，實驗結果顯示這種方法也能在即時系統上面穩定的運作。This paper presents a method using dual PTZ network cameras to automatically detect and track the invaders which intrude into an indoor surveillance space. The main advantage of using dual PTZ cameras in the indoor surveillance system is their assignment swap ability. Initially, one PTZ (called orientation camera) can be used to monitor the surveillance space to detect the invaders and the other (called zoom camera) then can track them. In the surveillance system, to obtain the front face picture of invaders as clear as possible is very important since the invader should be manually or automatically recognized after the events. However, the invaders may arbitrarily move in the surveillance space, thus the tracker which should extract the detail information of the invaders may never obtain the suitable pictures. Moreover, 3D tracking can help us to analyze the behavior of the invader, including when and what the invader has down in the surveillance space, in the future. We believe to swap the assignments of monitor and tracker can greatly increase the possibility to accomplish these kinds of surveillance demands. This paper proposes an assignment swap strategy applying dual PTZ cameras in the surveillance system. The experimental results show the method can work robustly in real-time.