Minimization and parameter estimation for seminorm regularization models with I-divergence constraints
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香港中文大學研究人員

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摘要In this paper, we analyze the minimization of seminorms parallel to L.parallel to on R-n under the constraint of a bounded I-divergence D(b, H.) for rather general linear operators H and L. The I-divergence is also known as Kullback-Leibler divergence and appears in many models in imaging science, in particular when dealing with Poisson data but also in the case of multiplicative Gamma noise. Often H represents, e.g., a linear blur operator and L is some discrete derivative or frame analysis operator. A central part of this paper consists in proving relations between the parameters of I-divergence constrained and penalized problems. To solve the I-divergence constrained problem, we consider various first-order primal-dual algorithms which reduce the problem to the solution of certain proximal minimization problems in each iteration step. One of these proximation problems is an I-divergence constrained least-squares problem which can be solved based on Morozov's discrepancy principle by a Newton method. We prove that these algorithms produce not only a sequence of vectors which converges to a minimizer of the constrained problem but also a sequence of parameters which converges to a regularization parameter so that the corresponding penalized problem has the same solution. Furthermore, we derive a rule for automatically setting the constraint parameter for data corrupted by multiplicative Gamma noise. The performance of the various algorithms is finally demonstrated for different image restoration tasks both for images corrupted by Poisson noise and multiplicative Gamma noise.
著者Teuber T, Steidl G, Chan RH
期刊名稱Inverse Problems
出版年份2013
月份3
日期1
卷號29
期次3
出版社IOP Publishing: Hybrid Open Access
國際標準期刊號0266-5611
電子國際標準期刊號1361-6420
語言英式英語
Web of Science 學科類別Mathematics; Mathematics, Applied; MATHEMATICS, APPLIED; Physics; Physics, Mathematical; PHYSICS, MATHEMATICAL

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