关键词: 图像增强, 边缘提取, 边缘去噪, 车牌定位

Abstract: License plate area contains rich edge and texture information,which is very uniform.This paper presents an efficient and robust approach for vehicle license plate location.Firstly,enhance the input image and detect the edges of the input image and enhanced image.Then remove most of the background and noise edges based on the threshold of the lengths of the edges.Finally,search the plate in the residual edge image through projection operation and segment it out from the original car image.The performance of the method was investigated on many real car images under complex conditions with various illuminations. The experimental results show that the proposed algorithms have high accuracy and robustness.

Key words: image enhancement, edge detection, edge-noise-removing, license-plate location