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Q-intersection Algorithms for Constraint-Based Robust Parameter Estimation

By Clément Carbonnel, Gilles Trombettoni, Philippe Vismara and Gilles Chabert


International audienceGiven a set of axis-parallel n-dimensional boxes, the q-intersection is defined as the smallest box encompassing all the points that belong to at least q boxes. Computing the q-intersection is a combinatorial problem that allows us to han-dle robust parameter estimation with a numerical constraint programming approach. The q-intersection can be viewed as a filtering operator for soft constraints that model measure-ments subject to outliers. This paper highlights the equiva-lence of this operator with the search of q-cliques in a graph whose boxicity is bounded by the number of variables in the constraint network. We present a computational study of the q-intersection. We also propose a fast heuristic and a sophisti-cated exact q-intersection algorithm. First experiments show that our exact algorithm outperforms the existing one while our heuristic performs an efficient filtering on hard problems

Topics: [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
Publisher: HAL CCSD
Year: 2014
OAI identifier: oai:HAL:hal-01084606v1
Provided by: HAL-Univ-Nantes

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