Hong Kong license plate recognition system

A Hong Kong license plate recognition system is proposed.Hong Kong license plate can be divided into two types:double-line and single-line.Every plate is included of two letters and three digitals or four digitals.Plates hung in front of cars are white-base and black-character.To this characteristic of Hong Kong plate,first color-binarize the plate image,then remove the impossible character regions,calculate horizontal gradients,scan the basic cells.After foregoing operations,the rough regions of plate is obtained.Then search the accurate plate location in those regions.Finally,get the characters from the plate location,and send them to back-end character recognition module.The experiments and practical usage show,the system has 93% correct recognition rate.