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Title:

Changes in Video Detection Performance at Signalized Intersections Over Different Illumination Conditions

Accession Number:

01126597

Language:

English

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-3595

Abstract:

An evaluation of the performance of video detection (VD) systems was conducted under five illumination conditions: dawn, sunny morning (long shadows), cloudy noon, dusk, and nighttime. Large datasets from the stop bar and advance detection zones of a signalized intersection, where three widely used VD systems were installed side-by-side, were used. Potential errors (false, missed, stuck-on, and dropped calls) were identified using a computer algorithm. Then, all the errors were visually verified using videos from the intersection. Significant illumination effects were found on all three systems. At the stop bar zones, false calls increased for all systems mostly in dawn (up to 31%), dusk (up to 51%), and night (up to 35%); while missed calls were only affected in one system and one zone with up to 29% missed vehicles. Stuck-on calls increased up to 8% in sunny conditions, and up to 6% in nighttime. At the advance zones, the three systems had the most false calls (up to 53%) during sunny conditions, while for missed calls only one system was critically affected (up to 18% missed), also in sunny conditions. Stuck-on calls were not a major concern (less than 2%) at the advance zones. Dropped calls were very rare and only three were observed in all conditions and for all systems. Detail quantification of the errors for each detection zone, as well as the identification of their main causes, are included in this paper. They can be used for improving current VD installations by eliminating sources of error, and for planning strategies to better use the VD strengths and overcome critical issues during typical illumination conditions.

TRIS Files:

HRIS

Report Numbers:

09-3595

Media Type:

DVD

Pagination:

16p

Authors:

Medina, Juan C

jcmedina@illinois.edu
University of Illinois, Urbana-Champaign

Benekohal, Rahim F

rbenekoh@uiuc.edu
University of Illinois, Urbana-Champaign

Chitturi, Madhav Vijaya

mchitturi@wisc.edu
University of Wisconsin, Madison

Monograph Accession #:

01120148

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC
Date: 2009/1/11 to 2009/1/15
Sponsors: Transportation Research Board

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 USA

Availability:

Find a library where document is available

Order URL: http://worldcat.org/oclc/6

Features:

Figures; Photos; References (7)

Index Terms:

Algorithms; Incident detection; Lighting; Nighttime accidents; Operations; Signalized intersections; Video cameras; Weather conditions

Subject Areas:

Highways; Operations and Traffic Management; I72: Traffic and Transport Planning

Last Modified:

Apr 17 2009 9:56AM