Structured Sparse Priors for Image Classification

Umamahesh Srinivas, Yuanming Suo, Minh Dao, Vishal Monga, Trac D. Tran

    Research output: Contribution to journalArticle

    29 Scopus citations

    Abstract

    Model-based compressive sensing (CS) exploits the structure inherent in sparse signals for the design of better signal recovery algorithms. This information about structure is often captured in the form of a prior on the sparse coefficients, with the Laplacian being the most common such choice (leading to l1-norm minimization). Recent work has exploited the discriminative capability of sparse representations for image classification by employing class-specific dictionaries in the CS framework. Our contribution is a logical extension of these ideas into structured sparsity for classification. We introduce the notion of discriminative class-specific priors in conjunction with class specific dictionaries, specifically the spike-and-slab prior widely applied in Bayesian sparse regression. Significantly, the proposed framework takes the burden off the demand for abundant training image samples necessary for the success of sparsity-based classification schemes. We demonstrate this practical benefit of our approach in important applications, such as face recognition and object categorization.

    Original languageEnglish (US)
    Article number7055925
    Pages (from-to)1763-1776
    Number of pages14
    JournalIEEE Transactions on Image Processing
    Volume24
    Issue number6
    DOIs
    StatePublished - Jun 1 2015

    All Science Journal Classification (ASJC) codes

    • Software
    • Computer Graphics and Computer-Aided Design

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