Modulated light trigger for license plate recognition cameras

Details Modulated light trigger for license plate recognition cameras Modulated light trigger for license plate recognition cameras

2007-05-15

2010-11-02

La, Anh V (Department: 2612)

Communications: electrical

Vehicle detectors

With camera

C340S933000, C382S105000

Reexamination Certificate

active

07825829

ABSTRACT:
A camera system comprises a CCD imaging device, an infrared illumination source, and a power modulator for amplitude modulating the infrared illumination, e.g., with a 7-kHz tone. A beam splitter is set in front of the CCD imaging device, and a photo-diode array is attached to the beam splitter to detect modulated infrared light returning from the same field of vision as the CCD imaging device Various tone filters, and triggers connected to the tone filters, will cause the CCD imaging device to take a digital picture when the returning modulated infrared light exceeds some threshold and comes from right areas of a picture frame. Such digital pictures will most probably include an image of a vehicle license plate that can be processed, and the results used to extract the registration data from a database.

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