LPR: Vision Based Parking Management
By Meta Rotenberg and Miriam Silva
The necessity to streamline the ongoing work of parking lots has resulted in the adoption of optical technology, integrating it into sophisticated parking systems. The technology is OCR - Optical Character Recognition - the electronic translation of alphanumeric
images into machine-editable text.
The unique application of OCR in the automotive sphere is LPR - License Plate Recognition - reading the license plates on vehicles, and storing the images captured by the cameras as well as the text from the
license plate.
In the first phase, the system's imaging hardware (specialized visual spectrum and infra-red spectrum cameras designed specifically for the task) captures the license plate's image. In the second phase, the system's software uses a series of proprietary image manipulation techniques to detect and enhance
the number plate's image, and proprietary OCR to extract the license plate's alphanumerics.
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