JAI VIS-CAM System, Installation Manual

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VIS-CAM Systems
2 Introduction
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 leveled 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).