关键词: 轮廓特征；OpenCV 数据库；车牌定位算法

Abstract: In order to detect the location information of the license plate in the image quickly and conveniently, this paper proposes a license plate location algorithm based on image contour features. This algorithm is based on the correlation function in the OpenCV database. Firstly, using image preprocessing operations to enhance images, and then the license plate is located by contour search and area filtering. Then, the eligible contour is filtered according to the pixel information and width height ratio of the license plate. Finally, using the green border to frame the license plate and display and save the image after positioning.

Key words: Contour features; OpenCV database; License plate positioning algorithm