1. A method for labeling a first region on a surface of a first object, said method comprising: determining a shape context of a point on said first object; comparing said shape context with an average shape context, said average shape context a function of a plurality of points in a second region on a second object; and determining as a function of said step of comparing that said point on said surface of said first object is within said first region, said first region corresponding to said second region on said second object.