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Proceedings Paper

Face detection by optimal atomic decomposition
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Paper Abstract

Atomic decompositions are lower-cost alternatives to the principal component analysis (PCA) in tasks where sparse signal representation is required. In pattern classifications tasks, e.g. face detection, a careful selection of atoms is needed in order to ensure an optimal and fast-operating decomposition to be used in the feature extraction stage. In this contribution, adaptive boosting is used as criterion for selecting optimal atoms as features in frontal face detection system. The goal is to speed up the learning process by a proper combination of a dictionary of atoms and a weak learner. Dictionaries of anisotropic wavelet packets are used where the total number of atoms is still feasible for large-size images. In the adaptive boosting algorithm a Bayesian classifier is used as a weak learner instead of a simple threshold, thus ensuring a higher accuracy for slightly increased computational cost during the detection stage. The experimental results obtained for four different dictionaries are quite promising based on the good localization properties of the anisotropic wavelet packet functions.

Paper Details

Date Published: 12 September 2005
PDF: 12 pages
Proc. SPIE 5916, Mathematical Methods in Pattern and Image Analysis, 59160G (12 September 2005); doi: 10.1117/12.622564
Show Author Affiliations
Vladislav Uzunov, Tampere Univ. of Technology (Finland)
Atanas Gotchev, Tampere Univ. of Technology (Finland)
Karen Egiazarian, Tampere Univ. of Technology (Finland)
Jaakko Astola, Tampere Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 5916:
Mathematical Methods in Pattern and Image Analysis
Jaakko T. Astola; Ioan Tabus; Junior Barrera, Editor(s)

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