THE Reference in Traffic Video Detection 1 Video Detection Sensor for Vehicle Presence Basic Principles, Selection, Installation & Configuration.

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Presentation transcript:

THE Reference in Traffic Video Detection 1 Video Detection Sensor for Vehicle Presence Basic Principles, Selection, Installation & Configuration

THE Reference in Traffic Video Detection 2 Video detection: Detection zones on video image TrafiCam: Vehicle presence detection Detection output generation

THE Reference in Traffic Video Detection 3 Basic functionality = vehicle presence Alternative functionality = count (number of pulses) = zone occupancy (length of pulses) Functionalities

THE Reference in Traffic Video Detection 4 TrafiCam “Wide Angle” (focal distance = 3mm): close range (0-25m) 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): longer distance (15-75m) 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 Selection: 2 lens types available

THE Reference in Traffic Video Detection 5 Camera View TrafiCam “Wide Angle” 0-25m 4 lanes

THE Reference in Traffic Video Detection 6 Camera View TrafiCam “Narrow Angle” 15-75m 4 lanes

THE Reference in Traffic Video Detection 7 Wide Angle Narrow Angle TrafiCam Wide Angle vs Narrow Angle

THE Reference in Traffic Video Detection 8 Example TrafiCam Wide Angle Three lanes, stop bar detection, TrafiCam overhead at 6m height

THE Reference in Traffic Video Detection 9 Example TrafiCam Narrow Angle Three lanes, advance detection, TrafiCam overhead at 8m height

THE Reference in Traffic Video Detection 10Installation no horizon in the image

THE Reference in Traffic Video Detection 11 be aware of optical occlusion! - on the same lane - on adjacent lanes 5m camera height, no offset9m camera height, no offset5m camera height, 2m offset Offset = distance from the edge of the roadInstallation

THE Reference in Traffic Video Detection 12 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! Installation

THE Reference in Traffic Video Detection 13 Examples Vertical Mounting

THE Reference in Traffic Video Detection 14 Example Horizontal Mounting

THE Reference in Traffic Video Detection 15 Example Alternative Mounting

THE Reference in Traffic Video Detection 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

THE Reference in Traffic Video Detection 17 Direction sensitivity Make a zone direction sensitive only to avoid unwanted detections A direction sensitive zone could decrease the detection performance Configuration

THE Reference in Traffic Video Detection 18 Vehicle headlights in detection zone detection during daytime: on vehicle detection at night: on vehicle headlights Configuration

THE Reference in Traffic Video Detection 19 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 Configuration

THE Reference in Traffic Video Detection 20 Traficon nv Tel.: +32 (0) Fax: +32 (0)

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