Abstract: As it’s difficult to well separate target from background for images in which background gray level is nonuniform, this paper proposes a new binarization method on the basis of previous work. Combined with Canny edge detection and based on edge gradient direction feature information, the method marks both sides of edge and labels uncertain points by voting to solve the problem of noises and artifacts. Experimental results show that the method works well.

Key words: binarization, gradient direction, both sides of edge, voting