I have seen number plate recognition cameras on the motorway with a red light visible at night. How does this pick up your number plate in the dark? What is the red light for?How does an infra-red traffic camera work.?
The red light is an infra red light source - selected so it does not blind drivers as a white one would. The camera is then designed to be sensitive to IR frequency light and so it "sees" in the dark.How does an infra-red traffic camera work.?
Infrared traffic sensor with feature curve generation
The present invention is an infrared traffic sensor with feature curve generation to derive empirical information for determining traffic patterns. A real-time IR image camera is positioned over an automobile and truck traffic thoroughfare for collecting video image data of the traffic thoroughfare. Data in the form of a video signal taken by the infrared video camera is received by a signal processing unit for processing the data. The processed data is used to generate statistical feature curves from which the empirical traffic information such as the number of vehicles, the speed of the vehicles, and the classification of the vehicles are determined.
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