hal-00565007, version 1
Manifold based local classifiers: linear and nonlinear approaches
Hakan Cevikalp 1Diane Larlus 2Mike Neamtu 3William Triggs
4Frederic Jurie
2, 5
Journal of Signal Processing Systems 61, 1 (2010) 61-73
Abstract: In case of insufficient data samples in highdimensional classification problems, sparse scatters of samples tend to have many ‘holes'—regions that have few or no nearby training samples from the class. When such regions lie close to inter-class boundaries, the nearest neighbors of a query may lie in the wrong class, thus leading to errors in the Nearest Neighbor classification rule. The K-local hyperplane distance nearest neighbor (HKNN) algorithm tackles this problem by approximating each class with a smooth nonlinear manifold, which is considered to be locally linear. The method takes advantage of the local linearity assumption by using the distances from a query sample to the affine hulls of query's nearest neighbors for decision making. However, HKNN is limited to using the Euclidean distance metric, which is a significant limitation in practice. In this paper we reformulate HKNN in terms of subspaces, and propose a variant, the Local Discriminative Common Vector (LDCV) method, that is more suitable for classification tasks where the classes have similar intra-class variations. We then extend both methods to the nonlinear case by mapping the nearest neighbors into a higherdimensional space where the linear manifolds are constructed. This procedure allows us to use a wide variety of distance functions in the process, while computing distances between the query sample and the nonlinear manifolds remains straightforward owing to the linear nature of the manifolds in the mapped space. We tested the proposed methods on several classification tasks, obtaining better results than both the Support Vector Machines (SVMs) and their local counterpart SVM-KNN on the USPS and Image segmentation databases, and outperforming the local SVMKNN on the Caltech visual recognition database.
- 1: Electrical and Electronics Engineering Department (ESOGU)
- Eskisehir Osmangazi University
- 2: LEAR (INRIA Grenoble Rhône-Alpes / LJK Laboratoire Jean Kuntzmann)
- CNRS : FR71 – CNRS : UMR5527 – INRIA – Laboratoire Jean Kuntzmann – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
- 3: Department of Mathematics, Vanderbilt University
- Vanderbilt University of Nashville
- 4: Laboratoire Jean Kuntzmann (LJK)
- CNRS : UMR5224 – Université Joseph Fourier - Grenoble I – Université Pierre Mendès-France - Grenoble II – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
- 5: Groupe de Recherche en Informatique, Image, Automatique et Instrumentation de Caen (GREYC)
- CNRS : UMR6072 – Université de Caen – Ecole Nationale Supérieure d'Ingénieurs de Caen
- Domain : Computer Science/Computer Vision and Pattern Recognition
- hal-00565007, version 1
- http://hal.archives-ouvertes.fr/hal-00565007
- oai:hal.archives-ouvertes.fr:hal-00565007
- From: William Triggs
- Submitted on: Thursday, 10 February 2011 16:59:25
- Updated on: Monday, 14 February 2011 11:07:46






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