Focusing on the problems of lane detection and running deflection for autonomous land vehicles,a reliable approach for fast vision computing is proposed in this paper.Two 5×5 template operators of directional filters are used to extract the edges of the image.The image is binarized with an automatic threshold derived from Otsu algorithm.To reduce the computational work,the position characters of the lanes in the image are concerned to remove the horizontal contour points.Meanwhile,the constraint conditions ...