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THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection1
Video Detection Sensor for Video Detection Sensor for Vehicle PresenceVehicle Presence
Basic Principles, Selection, Installation & Basic Principles, Selection, Installation & ConfigurationConfiguration
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection2
Video detection: Detection Video detection: Detection zones on video imagezones on video image
TrafiCam: TrafiCam: Vehicle presence Vehicle presence detectiondetection
Detection output Detection output generationgeneration
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection3
Basic functionality = vehicle presence
Alternative functionality
= count (number of pulses)
= zone occupancy (length of pulses)
FunctionalitiesFunctionalities
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection4
TrafiCam “Wide Angle” (focal distance = 3mm):
o Detection at close range (close range (0-25m0-25m)), with a wide camera viewo Rather vertical camera positiono 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 (longer distance (15-75m15-75m)), with a wide camera view, but zoomed ino More horizontal camera positiono Typical camera height:
o side fired: 8-12mo overhead: 6-10m
Selection: 2 lens types Selection: 2 lens types availableavailable
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection5
Camera View TrafiCam Camera View TrafiCam “Wide Angle”“Wide Angle”
0-25m
4 lanes
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection6
Camera View TrafiCam Camera View TrafiCam “Narrow Angle”“Narrow Angle”
15-75m
4 lanes
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection7
Wide Angle
Narrow Angle
TrafiCam Wide Angle vs TrafiCam Wide Angle vs Narrow AngleNarrow Angle
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection8
Example TrafiCam Example TrafiCam Wide AngleWide AngleThree lanes, stop bar detection, TrafiCam overhead at 6m height
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection9
Example TrafiCam Example TrafiCam Narrow AngleNarrow Angle
Three lanes, advance detection, TrafiCam overhead at 8m height
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection10
InstallationInstallation
no horizon in the image
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection11
be aware of optical occlusion!
- on the same lane- on adjacent lanes
5m camera height, no offset
9m camera height, no offset
5m camera height, 2m offset
Offset = distance from the edge of the road
InstallationInstallation
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection12
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!
InstallationInstallation
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection13
Examples Vertical Examples Vertical MountingMounting
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection14
Example Horizontal Example Horizontal MountingMounting
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection15
Example Alternative Example Alternative MountingMounting
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection16
ConfigurationConfigurationoptimal size of detection
zone = slightly exceeding size of a
regular carMultiple
detection zones per
lane possible to cover a larger areaSize regular car: about
2m wide & 5m long
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection17
Direction sensitivity
Make a zone direction
sensitive only to avoid unwanted
detectionsA direction sensitive zone could decrease the detection performance
ConfigurationConfiguration
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection18
Vehicle headlights in detection zone
detection during daytime: on vehicle detection
at night: on vehicle headlights
ConfigurationConfiguration
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection19
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
ConfigurationConfiguration
THETHE ReferenceReference in Traffic Video Detectionin Traffic Video Detection20
Traficon nv
Tel.: +32 (0)56 37 22 00
Fax: +32 (0)56 37 21 96
E-mail: [email protected]
www.traficam.com