Abstract: A simple algorithm for line-segment acquisition is illustrated in this paper.It is composed of threeprocedures of edge detection,thinning and symbolization,in which the time-segments of an image aresimply produced by means of direction code of edge points through three steps of scanning,linking andmending.Different levels of image representation,which,is especially suitable for line-segment-basedbinocular stereo vision system as its primitives,can be achieved accordihg to the paramters chosen.It is afast effective algorithm being more flexible and applicable.