A Novel Multi-Scale Representation for 2-D Shapes
Résumé
We present an original approach for 2-D shapes description. Based on a multi-scale analysis of closed contours, this method deals with the differential turning angle. The input contour is progressively low-pass filtered by decreasing the filter bandwidth. The output contour thus becomes increasingly smooth. At each iteration of the filtering we extract the essential points from the differential turning angle of the filtered contour to generate the d-TASS map. Experimental results show that the d-TASS is closely related to the contour and that it is rotation, translation and scale change invariant. It is also shearing and noise resistant. This function is local-oriented and appears to be particularly suitable for pattern recognition even for those patterns that have undergone occultation.