License plate(LP) location is key to vehicle license plate auto recognition system. In this paper

we propose a novel LP location method on RGB color space

which includes four steps: color feature extraction

feature images binaryzation

area filling and de-noising with morphology processing

plate candidate regions verification. Traditional color feature extraction is sensitive to iluminition based on which

we propose a new color feature extraction method that doesnt include the intensity component. For plate candidate regions verification

we discards some geometry features such as the area

length/width ratio

rectangle degree etc

those of which are widely used but sensitive to image size

and we utilizese the special characteristic of LP on character number and character arrangement uniformity to verify the candidate regions. 605 images with various size and illumination condition were tested

success rate of LP location was over 96%

which shows the color feature extraction method is robust to illumination change

and the plate verification is suitable for various image size.