Feature-specific difference imaging

Shikhar Uttam, Nathan A. Goodman, Mark A. Neifeld

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Difference images quantify changes in the object scene over time. In this paper, we use the feature-specific imaging paradigm to present methods for estimating a sequence of difference images from a sequence of compressive measurements of the object scene. Our goal is twofold. First is to design, where possible, the optimal sensing matrix for taking compressive measurements. In scenarios where such sensing matrices are not tractable, we consider plausible candidate sensing matrices that either use the available a priori information or are nonadaptive. Second, we develop closed-form and iterative techniques for estimating the difference images. We specifically look at l 2-and l 1-based methods. We show that l 2-based techniques can directly estimate the difference image from the measurements without first reconstructing the object scene. This direct estimation exploits the spatial and temporal correlations between the object scene at two consecutive time instants. We further develop a method to estimate a generalized difference image from multiple measurements and use it to estimate the sequence of difference images. For l 1-based estimation, we consider modified forms of the total-variation method and basis pursuit denoising. We also look at a third method that directly exploits the sparsity of the difference image. We present results to show the efficacy of these techniques and discuss the advantages of each.

Original languageEnglish (US)
Article number5993541
Pages (from-to)638-652
Number of pages15
JournalIEEE Transactions on Image Processing
Issue number2
StatePublished - Feb 2012
Externally publishedYes


  • Compressive sensing (CS)
  • difference images
  • feature-specific imaging (FSI)
  • l -reconstruction
  • l -reconstruction

ASJC Scopus subject areas

  • Software
  • Computer Graphics and Computer-Aided Design


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