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Patch-based Within-Object Classification

Aghajanian, J; Warrell, J; Prince, SJD; Li, P; Rohn, JL; Baum, B; (2009) Patch-based Within-Object Classification. In: 2009 IEEE 12TH INTERNATIONAL CONFERENCE ON COMPUTER VISION (ICCV). (pp. 1125 - 1132). IEEE

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Abstract

Advances in object detection have made it possible to collect large databases of certain objects. In this paper we exploit these datasets for within-object classification. For example, we classify gender in face images, pose in pedestrian images and phenotype in cell images. Previous work has mainly targeted the above tasks individually using object specific representations. Here, we propose a general Bayesian framework for within-object classification. Images are represented as a regular grid of non-overlapping patches. In training, these patches are approximated by a predefined library. In inference, the choice of approximating patch determines the classification decision. We propose a Bayesian framework in which we marginalize over the patch frequency parameters to provide a posterior probability for the class. We test our algorithm on several challenging "real world" databases.

Type:Proceedings paper
Title:Patch-based Within-Object Classification
Event:12th IEEE International Conference on Computer Vision
Location:Kyoto, JAPAN
Dates:2009-09-29 - 2009-10-02
ISBN-13:978-1-4244-4419-9
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Medicine (Division of) > Clinical Physiology
UCL > School of BEAMS > Faculty of Engineering Science > Computer Science

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