The authors propose a set of local shape descriptors for polygonsbased on edge length ratios. These descriptors are invariant under anyaffine transformation, i.e. translation, scaling, rotation andprojection from 3D to any 2D plane. Furthermore, they are complete inthe sense that they allow the reconstruction of any polygon in 3D spacegiven at least three consecutive vertices. The authors then consider therecognition of 2D polygonal objects under any affine transformation andin the presence of occlusion. they introduce a recognition procedurethat is based on the matching of edge length ratios, using a simplifiedversion of the standard dynamic programming procedure commonly employedfor string matching
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