An Automated Camera Repositioning Technique for Integrating Video Image Vehicle Detection Systems with Freeway CCTV Systems
Michael L. Pack, Brian Lee Smith, William T. Scherer · Transportation Research Board 82nd Annual MeetingTransportation Research Board · 2003
While there are several Video Image Vehicle Detection Systems (VIVDS) on the market that have the capability to automatically derive traffic measures from video imagery, these systems require the installation of fixed position cameras. Thus, they have not been integrated with the existing moveable CCTV cameras. This paper addresses VIVDS camera positioning and calibration challenges and develops a prototype machine-vision system that successfully integrates existing moveable CCTV cameras with VIVDS. Results of testing the prototype are presented which demonstrate that when the camera's initial zoom level was kept between 1 and 1.5x, the camera could consistently be returned to its original position with a repositioning accuracy of less than .03-.1 degrees regardless of the cameras displaced PTZ settings at the time of repositioning. This level of positional accuracy, when combined with a VIVDS resulted in vehicle count errors of less than 1%