recognition principle of license plate recognition system < / a >

Vehicle detection: various methods such as buried coil detection, infrared detection, radar detection technology and video detection can be used to sense the passing of vehicles and trigger image acquisition and capture

Image acquisition: real time and uninterrupted recording and acquisition of passing vehicles through HD camera capture host

Preprocessing: noise filtering, automatic white balance, automatic exposure, gamma correction, edge enhancement, contrast adjustment, etc

License plate location: row and column scanning is performed on the gray image after image preprocessing to determine the license plate area

Character segmentation: after locating the license plate area in the image, locate the character area accurately through grayscale, binarization and other processing, and then segment the character according to the character size characteristics

Character recognition: the segmented characters are scaled and feature extracted to match with the standard character expression in the character database template

Result output: output the result of license plate recognition in text format