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Video Detection Sensor for Vehicle Presence

Video Detection Sensor for Vehicle Presence. Basic Principles, Selection, Installation & Configuration. Video detection: Detection zones on video image TrafiCam: Vehicle presence detection Detection output generation. Functionalities. Basic functionality = vehicle presence.

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Video Detection Sensor for Vehicle Presence

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  1. Video Detection Sensor for Vehicle Presence Basic Principles, Selection, Installation & Configuration

  2. Video detection: Detection zones on video image TrafiCam: Vehicle presence detection Detection output generation

  3. Functionalities • Basic functionality = vehicle presence • Alternative functionality • = count (number of pulses) • = zone occupancy (length of pulses)

  4. Selection: 2 lens types available • TrafiCam “Wide Angle” (focal distance = 3mm): • Detection at close range (0-25m), with a wide camera view • Rather vertical camera position • Typical camera height: • side fired: 3,5-8m • overhead: 5-8m • TrafiCam “Narrow Angle” (focal distance = 8mm): • Detection at a longer distance (15-75m), with a wide camera view, but zoomed in • More horizontal camera position • Typical camera height: • side fired: 8-12m • overhead: 6-10m

  5. Camera View TrafiCam “Wide Angle” 0-25m 4 lanes

  6. Camera View TrafiCam “Narrow Angle” 15-75m 4 lanes

  7. TrafiCam Wide Angle vs Narrow Angle Narrow Angle Wide Angle

  8. Example TrafiCam Wide Angle Three lanes, stop bar detection, TrafiCam overhead at 6m height

  9. Example TrafiCam Narrow Angle Three lanes, advance detection, TrafiCam overhead at 8m height

  10. Installation no horizon in the image

  11. 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

  12. 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!

  13. Examples Vertical Mounting

  14. Example Horizontal Mounting

  15. Example Alternative Mounting

  16. 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

  17. Configuration Direction sensitivity Make a zone direction sensitive only to avoid unwanted detections A direction sensitive zone could decrease the detection performance

  18. Configuration Vehicle headlights in detection zone detection during daytime: on vehicle detection at night: on vehicle headlights

  19. 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

  20. 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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