1. A vision processing method, comprising the steps of: forming a shape-memory elastic contour model having a tendency to maintain an original shape, the shape-memory elastic contour model changing shape and position based upon an exterior operation; giving an outline of the shape-memory elastic contour model based upon an image of an object which has been photographed; displacing the outlined contour model to an area to be expected to be occupied by the image of the photographed object; modifying the shape-memory elastic contour model in response to an exterior force, wherein the exterior force is generated in the image of the photographed object; and determining an image coordinate of the photographed object based upon the modified model.