Segmentation and Recognition Techniques for Planar Contour

A new eleven-point method, which resists noise more effectively than common-used three-point method, is adopted to calculate the approximate curvature of planar contour. The graph of curvature difference is used to recognize all dominant points. Corner points and tangent points can be differentiated simultaneously because they have different wave shape in the graph of curvature difference. Line type between dominant points is recognized, then joint tuning, splitting and merging for arc segments are carried out. Our approach improved the preciseness in recognition and segmentation for planar contour.