A Method Based on Character Edge Color for Quick Locating Vehicle License Plate

Abstract

To locate vehicle license plate in complex scene, an algorithm which used plate’s character edge color multicomponent information, has been provided in this paper. This algorithm extracts plate’s background color pixels and character color pixels in HSV spaces firstly, then obtains plate’s background color texture by using image’s horizontal texture. During this process, those background color texture pixels which do not neighbor character color pixels have been abondoned. Due to the mutual impact of plate’s character color and background color, character’s edge color and saturation have a relative narrow range. By using this characteristics, searching area on plate could be reduced greatly. The algorithm not only improved plate’s locating accuracy greatly but also increased calculating speed.