seven principles of license plate recognition system < / a >

1. 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 the vehicle and trigger image acquisition and capture

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

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

4. License plate location: perform row and column scanning on the gray image after image preprocessing to determine the license plate area

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

6. Character recognition: zoom and extract the characters after segmentation, and match and distinguish with the standard character expression form in the character database template

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