基于窗口搜索的车牌定位算法研究与实现

License plate location is the key component of automatic vehicle license recognition system. A license plate locating algorithm based on window searching, including tow steps: primary location and precise location, was proposed in this paper. Primary location process utilized the denseness of pixels whose direction is vertical to locate the plate. The density of feature pixels in a fixed size window was calculated to find the primary candidate regions. Precise location process utilized the richness of the vertical edges of the characters on license plate. We can precisely locate the boundary of license plate using lines tracking. The results show that this algorithm can locate the plate precisely and quickly.