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dtect provides an automated system for determining the number of occupants within moving road vehicles. It is based on the VOL patent protected methodology. dtect can be used for a variety of applications such as congestion charging, road tolling, high occupancy vehicle lane enforcement and occupancy data gathering.
The complete dtect system is contained within a single weather and vandal proof housing. dtect can be installed either roadside on a pole or suspended over the road on a gantry. Once installed and configured dtect can be controlled remotely via an encrypted internet link.
dtect requires: a suitable support structure; 240 or 110 V ac power supply; either a cable or wireless interface to the internet and a vehicle position detection system to trigger its operation.
When it receives a signal from the vehicle position detection system dtect illuminates the windscreen area with two different wavelengths of infrared light. Two specialised digital infrared pictures are taken of the windscreen at the instant of illumination. These pictures are processed using the unique dtect algorithms and the vehicle occupancy count is determined. dtect completes it processing in a fraction of second after the original trigger signal. The output, in the form of the occupancy count and the pictures used to determine that count, is transmitted using the dtect encrypted internet interface.
The output from dtect can either be integrated into a larger automated traffic management system or transmitted to a remote terminal for human post-processing. For privacy reasons the pictures output from dtect are modified so that it is not possible to determine the identity of the vehicle occupants.
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