Car plate character extraction under complicated environment

License plate recognition (LPR) system has many applications. Character extraction is a key step in LPR system. The proposed character extraction method in this paper is mainly according to plate´s geometrical characteristic and supplementary with the scan of projection image. Subsequently, locate the plate character sequence, then do more jobs on false characters elimination and verify the validity of extracted characters. The above methods lead to an ideal character extraction result, which leads higher recognition accuracy of the LPR system