Primal-dual algorithms for total variation based image restoration under Poisson noise
Publication in refereed journal


摘要We consider the problem of restoring images corrupted by Poisson noise. Under the framework of maximum a posteriori estimator, the problem can be converted into a minimization problem where the objective function is composed of a Kullback-Leibler (KL)-divergence term for the Poisson noise and a total variation (TV) regularization term. Due to the logarithm function in the KL-divergence term, the non-differentiability of TV term and the positivity constraint on the images, it is not easy to design stable and efficiency algorithm for the problem. Recently, many researchers proposed to solve the problem by alternating direction method of multipliers (ADMM). Since the approach introduces some auxiliary variables and requires the solution of some linear systems, the iterative procedure can be complicated. Here we formulate the problem as two new constrained minimax problems and solve them by Chambolle-Pock’s first order primal-dual approach. The convergence of our approach is guaranteed by their theory. Comparing with ADMM approaches, our approach requires about half of the auxiliary variables and is matrix-inversion free. Numerical results show that our proposed algorithms are efficient and outperform the ADMM approach.
著者Wen Y., Chan R.H., Zeng T.
期刊名稱Science China Mathematics
詳細描述To ORKTS: This article is:
Received on 17 November 2014 and accepted on 22 January 2015
出版社Zhongguo Kexue Zazhishe/Science in China Press
關鍵詞alternating direction method of multipliers (ADMM), image restoration, minimax problem, Poisson noise, primal-dual, total variation (TV)

上次更新時間 2020-28-10 於 02:34