The fully digital cameras used in the Unicam traffic monitoring systems have high resolution, built-in intelligence, standard interfaces, and robust compact construction.
The images taken by the detail Unicam cameras demonstrate the qualitative difference compared to the ones taken by cameras with a common TV resolution.
HDTV cameras (left) capture a wide angle, so not only the monitored lane is visible, but also the adjoining lanes are partially visible, the whole vehicle, legible license plate and the face of the driver. In case of TV cameras (right), due to the same detail resolution for the algorithms, these objects will not be visible - see the simulation of the same pixel size when using TV cameras.
The use of the cameras enables, in case of the red light violation detection, recording of the situation in the intersection and the driver's behavior, which helps to prove violations.
The overview cameras are generally used for red light violation detection. They recognize traffic lights phases (red-amber-green) and then record the driver's behavior before entering the intersection. A long-term experience with Unicam systems in the field shows that to be able to prove a violation without a doubt, it is necessary to see a sufficiently long section of the road in front of the stop-line. This ensures that questionable violations will not be processed (e.g. when a vehicle has stopped in the intersection and had to stay there when the red light was on for example due an obstacle felled on the road). An example of the difference between Unicam (left) and the standard TV camera (right) view is demonstrated in the following pictures.
The picture taken by the Unicam camera (on the left) records both traffic lights and a sufficient distance before the intersection. Using the TV resolution overview camera (on the right), the vehicle in front of the intersection is not visible at all.