TheseEdges are points where there is a boundary (or an edge) between two image regions. In general, thean edge can be of analmost arbitrary shape, and may include junctions. In practice, edges are usually defined as sets of points in the image which have a strong [[gradient]] magnitude. Furthermore, some common algorithms will then chain high gradient points together to form a more complete description of an edge. These algorithms may place some constraints on the shape of an edge.
