Detection of contours of wheels based on improved codebook

In this paper, a detection method of contours of wheels for high real-time is proposed. Since the classic codebook algorithm is difficult to deal with the situation such as global sudden light changes, a improved codebook algorithm is presented. First of all, the moving vehicle is extracted in the video recording the side of vehicle by the improved codebook algorithm. And then the contours of the object are extracted in the binarization image processed by the optimal threshold algorithm. Then all the circularity of the contours are calculated by the circularity formula to locate the circular contours. At last the circular contours located by calculating the circularity are verified by Hough transform circle detection method. Experimental results show that this method can locate the wheels of vehicle with high real-time and strong robustness.