Method and apparatus for automatically recognizing license plate

Details Method and apparatus for automatically recognizing license plate Method and apparatus for automatically recognizing license plate

1988-04-20

1989-10-31

Eisenzopf, Reinhard J.

Image analysis

Histogram processing

For setting a threshold

382 11, 382 10, 382 48, 382 29, G06K 900

Patent

active

048782483

ABSTRACT:
An apparatus and method for automatically recognizing the characters on a license plate which is fixed on a vehicle. A sensor/controller device is utilized to detect whether the vehicle has reached a predetermined position for image sampling, and to release a trigger signal when the vehicle has reached the predetermined position. An image processing unit is coupled to the sensor/controller device to receive the trigger signal and then to send an image-sampling instruction to an image-sampling device. The image-sampling device is coupled to the image processing unit, and samples a vehicle image including the image of the license plate in response to the image-sampling instruction. The vehicle image is converted into an electric signal by the image-sampling device, which in turn is sent back to the image processing unit. The image processing unit digitizes the electric signal, and process the digitized electric signal to estimate the position of the license plate, to determine the bounding edges of the characters on the license plate, to separate each character on the license plate, and to recognize each separated character.

REFERENCES:
patent: 4097847 (1978-06-01), Forsen
patent: 4559644 (1985-12-01), Kataoka
patent: 4567609 (1986-01-01), Metcalf

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