On Unsupervised Partial Shape Correspondence

Amit Bracha, Thomas Dagès, Ron Kimmel

Abstract: While dealing with matching shapes to their parts, we often apply a tool known as functional maps. The idea is to translate the shape matching problem into “convenient” spaces by which matching is performed algebraically by solving a least squares problem. Here, we argue that such formulations, though popular in this field, introduce errors in the estimated match when partiality is invoked. Such errors are unavoidable even for advanced feature extraction networks, and they can be shown to escalate with increasing degrees of shape partiality, adversely affecting the learning capability of such systems. To circumvent these limitations, we propose a novel approach for partial shape matching.