IEEE Trans Image Process - Feature-specific difference imaging.

Tópicos

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{ motion(1329) object(1292) video(1091) }
{ result(1111) use(1088) new(759) }
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{ measur(2081) correl(1212) valu(896) }
{ first(2504) two(1366) second(1323) }
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Resumo

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.

Resumo Limpo

differ imag quantifi chang object scene time paper use featurespecif imag paradigm present method estim sequenc differ imag sequenc compress measur object scene goal twofold first design possibl optim sens matrix take compress measur scenario sens matric tractabl consid plausibl candid sens matric either use avail priori inform nonadapt second develop closedform iter techniqu estim differ imag specif look l lbase method show lbase techniqu can direct estim differ imag measur without first reconstruct object scene direct estim exploit spatial tempor correl object scene two consecut time instant develop method estim general differ imag multipl measur use estim sequenc differ imag lbase estim consid modifi form totalvari method basi pursuit denois also look third method direct exploit sparsiti differ imag present result show efficaci techniqu discuss advantag

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