A directional detector for edge based on difference images

In this paper, we propose a novel method for edge detection based on difference images. In order to increase the ability of difference images in direction detection, we propose a maximum modulus technique, whose singularities are located both by the gray differences and maximum gradient directions. That is, the singularities are located along the gradient directions with maximum difference modulus. The whole framework both on theory and application is given in this paper. Experiments show that the new technique has very good visual behaves.