Skip to content

A safe operating space for humanity

by Johan Rockstrom
Nature ()
Get full text at journal

Abstract

Difference images quantify changes in the object scene over time. In this paper we use the featurespecific 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 two-fold. First, 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 non-adaptive. Second, we develop closed-form and iterative techniques for estimating the difference images. We specifically look at 2- and 1-based methods. We show that 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 1-based estimation we consider modified forms of the total variation (TV) method and basis pursuit denoising (BPDN). 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.

Author-supplied keywords

Cite this document (BETA)

Readership Statistics

2933 Readers on Mendeley
by Discipline
 
58% Environmental Science
 
13% Agricultural and Biological Sciences
 
8% Social Sciences
by Academic Status
 
23% Student > Master
 
22% Student > Ph. D. Student
 
19% Researcher
by Country
 
3% United States
 
2% United Kingdom
 
1% Germany

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in