Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/108834
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Type: | Journal article |
Title: | Extrinsic methods for coding and dictionary learning on Grassmann manifolds |
Author: | Harandi, M. Hartley, R. Shen, C. Lovell, B. Sanderson, C. |
Citation: | International Journal of Computer Vision, 2015; 114(2-3):113-136 |
Publisher: | Springer |
Issue Date: | 2015 |
ISSN: | 0920-5691 1573-1405 |
Statement of Responsibility: | Mehrtash Harandi, Richard Hartley, Chunhua Shen, Brian Lovell, Conrad Sanderson |
Abstract: | Sparsity-based representations have recently led to notable results in various visual recognition tasks. In a separate line of research, Riemannian manifolds have been shown useful for dealing with features and models that do not lie in Euclidean spaces. With the aim of building a bridge between the two realms, we address the problem of sparse coding and dictionary learning in Grassmann manifolds, i.e., the space of linear subspaces. To this end, we propose to embed Grassmann manifolds into the space of symmetric matrices by an isometric mapping. This in turn enables us to extend two sparse coding schemes to Grassmann manifolds. Furthermore, we propose an algorithm for learning a Grassmann dictionary, atom by atom. Lastly, to handle non-linearity in data, we extend the proposed Grassmann sparse coding and dictionary learning algorithms through embedding into higher dimensional Hilbert spaces. Experiments on several classification tasks (gender recognition, gesture classification, scene analysis, face recognition, action recognition and dynamic texture classification) show that the proposed approaches achieve considerable improvements in discrimination accuracy, in comparison to state-of-the-art methods such as kernelized Affine Hull Method and graph-embedding Grassmann discriminant analysis. |
Keywords: | Riemannian geometry; Grassmann manifolds; sparse coding; dictionary learning |
Rights: | © Springer Science+Business Media New York 2015 |
DOI: | 10.1007/s11263-015-0833-x |
Grant ID: | http://purl.org/au-research/grants/arc/DP130104567 http://purl.org/au-research/grants/arc/F120100969 |
Published version: | http://dx.doi.org/10.1007/s11263-015-0833-x |
Appears in Collections: | Aurora harvest 3 Computer Science publications |
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RA_hdl_108834.pdf Restricted Access | Restricted Access | 1.87 MB | Adobe PDF | View/Open |
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