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VIS-CAM System
2 Preparing for Installation
Figure 1. VIS elements
1.3 System Components description
1.3.1 Traffic Light Sensor – TLS300
The JAI traffic light sensor is the driver of the VIS control network. It controls video signal
parameters of each camera to ensure high contrast images of passing vehicles and their license
plates, regardless of vehicle speed, weather or ambient light conditions.
Under the clear plastic dome of the traffic light sensor are mounted, in opposing directions, two
vertical plates and corresponding light collection staffs that protrude above a flat black base plate.
The sensor measures the ambient light reflecting off the face of both vertical plates. The design is
such that when the face of one plate is in direct sun, the other one is in shadow. These two
measurements identify the range of light levels that the camera is required to image without
saturation when a vehicle and its license plate are in the camera’s field of view (FOV). To ensure
correct functionality of the TLS-300, it is very important to ensure during installation, that the
sensor’s base plate is levelled with the road surface, and that the orientation of the sensor is
rotated so that the direction from the vertical plate A to vertical plate B is the same as the
direction of the traffic flow being observed by the traffic camera (see Figure 2).