Robust matching and recognition using context-dependent kernels

  • Authors:
  • Hichem Sahbi;Jean-Yves Audibert;Jaonary Rabarisoa;Renaud Keriven

  • Affiliations:
  • Telecom ParisTech, Paris, France;Certis - Ecole des Ponts, Marne-la-Vallée, France and Willow - ENS / INRIA, Paris, France;Certis - Ecole des Ponts, Marne-la-Vallée, France;Certis - Ecole des Ponts, Marne-la-Vallée, France

  • Venue:
  • Proceedings of the 25th international conference on Machine learning
  • Year:
  • 2008

Quantified Score

Hi-index 0.00

Visualization

Abstract

The success of kernel methods including support vector machines (SVMs) strongly depends on the design of appropriate kernels. While initially kernels were designed in order to handle fixed-length data, their extension to unordered, variable-length data became more than necessary for real pattern recognition problems such as object recognition and bioinformatics. We focus in this paper on object recognition using a new type of kernel referred to as "context-dependent". Objects, seen as constellations of local features (interest points, regions, etc.), are matched by minimizing an energy function mixing (1) a fidelity term which measures the quality of feature matching, (2) a neighborhood criterion which captures the object geometry and (3) a regularization term. We will show that the fixed-point of this energy is a "context-dependent" kernel ("CDK") which also satisfies the Mercer condition. Experiments conducted on object recognition show that when plugging our kernel in SVMs, we clearly outperform SVMs with "context-free" kernels.