Research on Technology of Vehicle License Plate Location in Color Image

Abstract:
In order to directly extract the license plate region of color image, a kind of license plate location technology is put forward, which is based on HSI color space. The plate background and the difference of character color, as well as the texture features of character distribution are used to locate the license plate. The transformation of color space from Red, Green, and Blue (RGB) to the Hue, Saturation, and Intensity (HSI) was the first step, which was used to extract the plate background. According to the different color between character and license plate, the middle position of license plate was found out and the coordinates were output. Then, according to the coordinates, the accurate position of license plate was obtained by the scanning and processing of the license plate region. The result shows that compared with the technology of license plate location which is based on gray image. This kind of technology has the advantages of high speed, high flexibility, and can easily eliminate the non-plate regio