title: Parameter estimation in TV image restoration using variational distribution approximation.
abstract: In this paper, we propose novel algorithms for total variation (TV) based image restoration and parameter estimation utilizing variational distribution approximations. Within the hierarchical Bayesian formulation, the reconstructed image and the unknown hyper parameters for the image prior and the noise are simultaneously estimated. The proposed algorithms provide approximations to the posterior distributions of the latent variables using variational methods. We show that some of the current approaches to TV-based image restoration are special cases of our framework. Experimental results show that the proposed approaches provide competitive performance without any assumptions about unknown hyper parameters and clearly outperform existing methods when additional information is included.
authors.affiliation: Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208-3118, USA. sdb@northwestern.edu
authors.forename: S Derin
authors.initials: SD
authors.lastname: Babacan
authors.forename: Rafael
authors.initials: R
authors.lastname: Molina
authors.forename: Aggelos K
authors.initials: AK
authors.lastname: Katsaggelos
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D015233:Models, Statistical; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013690:Television; D014741:Video Recording / Q000379:methods*