Are sparse representations really relevant for image classification?

R Rigamonti, Matthew A Brown, V Lepetit

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

168 Citations (SciVal)


Recent years have seen an increasing interest in sparse representations for image classification and object recog- nition, probably motivated by evidence from the analysis of the primate visual cortex. It is still unclear, however, whether or not sparsity helps classification. In this pa- per we evaluate its impact on the recognition rate using a shallow modular architecture, adopting both standard fil- ter banks and filter banks learned in an unsupervised way. In our experiments on the CIFAR-10 and on the Caltech- 101 datasets, enforcing sparsity constraints actually does not improve recognition performance. This has an impor- tant practical impact in image descriptor design, as enforc- ing these constraints can have a heavy computational cost.
Original languageEnglish
Title of host publication2011 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Number of pages8
ISBN (Print)9781457703942
Publication statusPublished - Jul 2011
EventIEEE Computer Vision and Pattern Recognition (CVPR) 2011 - Colorado Springs
Duration: 21 Jun 201125 Jun 2011


ConferenceIEEE Computer Vision and Pattern Recognition (CVPR) 2011
CityColorado Springs


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