关键词: HSI, 车牌颜色识别, 数学形态学

Abstract: As the color recognition rate of the license plate is not high in complex environment，a hierarchical method of color recognition of the license plates is presented in this paper.First，it projects the original color image to the HSI color space，and the preliminary recognition result is according to the different distribution of different license plate in HSI color space.Then the prospects of the license plate are extracted from the backgrounds，whose color information is used for getting the second recognition result.According to the above two steps，it gets the ultimate recognition results.The experimental results show that the proposed method is quite effective and robust.

Key words: HSI, color recognition of license plates, mathematical morphology