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Discriminative block-diagonal covariance descriptors for image set classification

Ren, Jieyi, Wu, Xiao-jun and Kittler, Josef (2020) Discriminative block-diagonal covariance descriptors for image set classification Pattern Recognition Letters, 136. pp. 230-236.

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Image set classification has recently received much attention due to its various applications in pattern recognition and computer vision. To compare and match image sets, the major challenges are to devise an effective and efficient representation and to define a measure of similarity between image sets. In this paper, we propose a method for representing image sets based on block-diagonal Covariance Descriptors (CovDs). In particular, the proposed image set representation is in the form of non-singular covariance matrices, also known as Symmetric Positive Definite (SPD) matrices, that lie on Riemannian manifold. By dividing each image of an image set into square blocks of the same size, we compute the corresponding block CovDs instead of the global one. Taking the relative discriminative power of these block CovDs into account, a block-diagonal SPD matrix can be constructed to achieve a better discriminative capability. We extend the proposed approach to work with bidirectional CovDs and achieve a further boost in performance. The resulting block-diagonal SPD matrices combined with Riemannian metrics are shown to provide a powerful basis for image set classification. We perform an extensive evaluation on four datasets for several image set classification tasks. The experimental results demonstrate the effectiveness and efficiency of the proposed method.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Ren, Jieyi
Wu, Xiao-jun
Date : 12 May 2020
Funders : EPSRC, National Natural Science Foundation of China, Ministry of Education of China
DOI : 10.1016/j.patrec.2020.05.018
Grant Title : EPSRC Programme Grant (FACER2VM)
Copyright Disclaimer : © 2020 Elsevier B.V. All rights reserved.
Additional Information : Embargo OK Metadata OK No further action
Depositing User : James Marshall
Date Deposited : 09 Jul 2020 09:13
Last Modified : 09 Jul 2020 09:13

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