00968436

Component

https://doi.org/10.3141/1856-04

http://scholar.google.com...erer&publication_year=2003

Transportation agencies have invested significantly in extensive closed-circuit television (CCTV) systems to monitor freeways in urban areas. While these systems have proven to be very effective in supporting incident management, they do not support the collection of quantitative measures of traffic conditions. Instead, they simply provide images that must be interpreted by trained operators. 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. VIVDS camera positioning and calibration challenges were addressed and a prototype machine-vision system was developed that successfully integrated existing moveable CCTV cameras with VIVDS. Results of testing the prototype are presented indicating that when the camera's initial zoom level was kept between x1 and x1.5, the camera consistently could be returned to its original position with a repositioning accuracy of less than 0.03 deg to 0.1 deg regardless of the camera's displaced pan, tilt, or zoom 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%.

This paper appears in Transportation Research Record No. 1856, Freeways, High-Occupancy Vehicle Systems, and Traffic Signal Systems 2003.

English

p. 25-33

2003

Transportation Research Record

0309085926

Figures (10) ; References (3) ; Tables (3)

Calibration; Cameras; Closed circuit television; Errors; Freeways; Integrated systems; Machine vision; Monitoring; Positioning; Prototypes; Traffic counting; Traffic data; Video imaging detectors

Automated camera repositioning; Fixed position cameras; Moveable cameras; Repositioning accuracy

Bridges and other structures; Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Jan 2 2004 12:00AM

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