Video Detection Sensor for Vehicle Presence
Basic Principles, Selection, Installation & Configuration
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Video detection: Detection zones on video image
TrafiCam: Vehicle presence detection
Reference generation
in Traffic Video Detection
DetectionTHEoutput
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Functionalities
 Basic functionality = vehicle presence
 Alternative functionality
= count (number of pulses)
= zone occupancy (length of pulses)
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Selection: 2 lens types available
 TrafiCam “Wide Angle” (focal distance = 3mm):
o Detection at close range (0-25m), with a wide camera view
o Rather vertical camera position
o Typical camera height:
o side fired: 3,5-8m
o overhead: 5-8m
 TrafiCam “Narrow Angle” (focal distance = 8mm):
o Detection at a longer distance (15-75m), with a wide camera view, but zoomed in
o More horizontal camera position
o Typical camera height:
o side fired: 8-12m
o overhead: 6-10m
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Camera View TrafiCam “Wide Angle”
0-25m
4 lanes
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Camera View TrafiCam “Narrow Angle”
15-75m
4 lanes
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TrafiCam Wide Angle vs Narrow Angle
Narrow Angle
Wide Angle
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Example TrafiCam Wide Angle
Three lanes, stop bar detection, TrafiCam overhead at 6m height
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Example TrafiCam Narrow Angle
Three lanes, advance detection, TrafiCam overhead at 8m height
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Installation
no horizon in the image
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Installation
be aware of optical occlusion!
5m camera height, no offset
9m camera height, no offset
5m camera height, 2m offset
- on the same lane
- on adjacent lanes
Offset = distance from the edge of the road
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Installation
vertical or horizontal mounting
Mount on solid infrastructure
Fixation with bolts or (stainless
steel) bands
Try to avoid camera movement. This could decrease the detection performance!
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Examples Vertical Mounting
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Example Horizontal Mounting
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Example Alternative Mounting
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Configuration
optimal size of detection zone =
slightly exceeding size of a regular car
Multiple detection
zones per lane possible
to cover a larger area
Size regular car: about 2m wide & 5m long
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Configuration
Direction sensitivity
Make a zone direction
sensitive only to avoid
unwanted detections
A direction sensitive zone could
decrease the detection performance
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Configuration
Vehicle headlights in detection zone
detection during daytime: on vehicle detection
at night: on vehicle headlights
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Configuration
Advanced settings:
 Use headlight reflection suppression only when strong reflections
are expected
 Use tree shadow suppression only when strong tree shadows are
expected
 Use camera movement suppression only when significant camera
shaking is expected
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Traficon nv
Tel.: +32 (0)56 37 22 00
Fax: +32 (0)56 37 21 96
E-mail: traficon@traficon.com
www.traficam.com
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