For use in camera systems for automatic license plate recognition at toll stations or entrances to parking garages, Osram has unveiled a new high-power infrared LED which gives these cameras higher-contrast images for many types of license plates, making it easier to retrieve the license plate numbers. According to the firm, this will allow automated barriers function more smoothly, reducing waiting times for drivers. Other camera applications which can benefit from the new IR LED include traffic monitoring and closed-circuit television (CCTV) systems.
Compared to 850 nm and 940 nm IR LEDs typically used today, the new 810 nm infrared LED, the SFH 4703AS, is particularly suited for creating high-contrast images in camera systems used to read license plates.
According to the firm, this additional wavelength helps improve image contrast making it easier to read patterns from recorded images. Moreover, camera sensors have higher sensitivity at 810 nm. At the same optical output, the new device therefore extends the range of camera systems as compared to 850 nm.
Alternatively, designers can reduce the number of components if they wish to maintain the same range.
For further details, view the full Press release.