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Modeling the Spatial Layout of Images Beyond Spatial Pyramids

Sanchez, J, Perronnin, F and de Campos, TE (2012) Modeling the Spatial Layout of Images Beyond Spatial Pyramids Pattern Recognition Letters.

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Abstract

Several state-of-the-art image representations consist in averaging local statistics computed from patch-level descriptors. It has been shown by Boureau et al. that such average statistics suffer from two sources of variance. The first one comes from the fact that a finite set of local statistics are averaged. The second one is due to the variation in the proportion of object-dependent information between different images of the same class. For the problem of object classification, these sources of variance affect negatively the accuracy since they increase the overlap between class-conditional probabilities. Our goal is to include information about the spatial layout of images in image signatures based on average statistics. We show that the traditional approach to including the spatial layout – the Spatial Pyramid (SP) – increases the first source of variance while only weakly reducing the second one. We therefore propose two complementary approaches to account for the spatial layout which are compatible with our goal of variance reduction. The first one models the spatial layout in an image-independent manner (as is the case of the SP) while the second one adapts to the image content. A significant benefit of these approaches with respect to the SP is that they do not incur an increase of the image signature dimensionality. We show on PASCAL VOC 2007, 2008 and 2009 the benefits of our approach.

Item Type: Article
Authors :
AuthorsEmailORCID
Sanchez, JUNSPECIFIEDUNSPECIFIED
Perronnin, FUNSPECIFIEDUNSPECIFIED
de Campos, TEUNSPECIFIEDUNSPECIFIED
Date : 6 August 2012
Identification Number : https://doi.org/10.1016/j.patrec.2012.07.019
Contributors :
ContributionNameEmailORCID
EditorBorgefors, GUNSPECIFIEDUNSPECIFIED
EditorSanniti di Baja, GUNSPECIFIEDUNSPECIFIED
EditorSarkar, SUNSPECIFIEDUNSPECIFIED
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:10
Last Modified : 28 Mar 2017 14:10
URI: http://epubs.surrey.ac.uk/id/eprint/726085

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