Site Logo
x

Title:

Illumination and Wind Effects on Video Detection Performance at Signalized Intersections

Accession Number:

01099357

Language:

English

Source Data:

Transportation Research Board Annual Meeting 2008 Paper #08-2866

Abstract:

The detection performance of video detection systems at intersections, from three major manufacturers, was evaluated using a side-by-side installation and large datasets. The performance at three stop bar detection zones under two illumination conditions is presented: day with no shadows (cloudy days) and night. In addition, these two conditions and day time with shadows (sunny mornings) are also evaluated under windy conditions. Four measures of performance were used to quantify the errors in the detection: false calls, missed calls, stuck-on calls, and dropped calls. Activation and deactivation times of the detection zones were used to automate the initial calculation of errors, while video images from the intersection were used for their manual verification. Night time results showed an average decrease in false calls for the left-most lane (from about 14% to 9%), but an increase for the middle lane (from 1.5% to 23%) and thru-right lane (from 0.8% to 13%). Vehicle headlights reflecting on adjacent zones and the view angle of the cameras were important factors in false calls. Missed calls in night time increased only for one system in one lane (from 0.2% to 26%). Wind increased false calls, mostly in sunny morning conditions (long shadows) between 12% and 17% on average, and reduced stuck-on calls due to the camera oscillation movement. Missed calls increased in day time only, from 0.9% to 2.4%, but it was not possible to identify the exact cause for this increase after a visual inspection of the videos.

TRIS Files:

HRIS

Report Numbers:

08-2866

Media Type:

DVD

Pagination:

17p

Authors:

Medina, Juan C

Phone: 217-333-5967
jcmedina@uiuc.edu
University of Illinois, Urbana-Champaign

Chitturi, Madhav Vijaya

Phone: 217-333-8988
Fax: 217-333-1924
mchitturi@uiuc.edu
University of Illinois, Urbana-Champaign

Benekohal, Rahim F

Phone: 217-244-6288
Fax: 217-333-1924
rbenekoh@uiuc.edu
University of Illinois, Urbana-Champaign

Monograph Accession #:

01084478

Publication Date:

2008

Conference:

Transportation Research Board 87th Annual Meeting

Location: Washington DC
Date: 2008/1/13 to 2008/1/17
Sponsors: Transportation Research Board

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 USA

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 USA

Features:

Figures; Photos; References (7) ; Tables (1)

Index Terms:

Cameras; Detectors; Headlamps; Lighting; Operations; Signalized intersections; Types of intersections; Video cameras; Wind

Subject Areas:

Administration and Management; Highways; Operations and Traffic Management; I73: Traffic Control

Last Modified:

May 21 2008 7:05AM