Feature Densities are Required for Computing Feature Correspondences

Part of Advances in Neural Information Processing Systems 6 (NIPS 1993)

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Subutai Ahmad


The feature correspondence problem is a classic hurdle in visual object-recognition concerned with determining the correct mapping between the features measured from the image and the features ex(cid:173) pected by the model. In this paper we show that determining good correspondences requires information about the joint probability density over the image features. We propose "likelihood based correspondence matching" as a general principle for selecting op(cid:173) timal correspondences. The approach is applicable to non-rigid models, allows nonlinear perspective transformations, and can op(cid:173) timally deal with occlusions and missing features. Experiments with rigid and non-rigid 3D hand gesture recognition support the theory. The likelihood based techniques show almost no decrease in classification performance when compared to performance with perfect correspondence knowledge.