The angle-of-sight signature for 2D shape analysis

A new 2D shape-encoding scheme is introduced which is based on the idea of the angle-of-sight. The shape can be efficiently transformed into a 1D signature by recording the angle-of-sight vs. distance of each boundary point with respect to a shape-specific chord-of-sight. The chord-of-sight is selected by using an extension of the motion of shape to geometrical entities, which are not part of the shape boundary-to the idea of shape-specific points and the characteristic ellipse. The angle-of-sight signature is a unique, information-preserving, transformation-invariant shape representation. It is demonstrated that the angle-of-sight shape-encoding scheme is capable of deriving well-behaved noise-tolerant signals, convenient for shape matching through alignment of signatures