Constrained Total Variation Deblurring Models and Fast Algorithms Based on Alternating Direction Method of Multipliers

Raymond H. Chan The Chinese University of Hong Kong Min Tao Nanjing University of Posts and Telecommunications Xiaoming Yuan Hong Kong Baptist University

Optimization and Control mathscidoc:1705.27002

SIAM Journal on Imaging Sciences, 6, (1), 680-697, 2013
The total variation (TV) model is attractive in that it is able to preserve sharp attributes in images. However, the restored images from TV-based methods do not usually stay in a given dynamic range, and hence projection is required to bring them back into the dynamic range for visual presentation or for storage in digital media. This will affect the accuracy of the restoration as the projected image will no longer be the minimizer of the given TV model. In this paper, we show that one can get much more accurate solutions by imposing box constraints on the TV models and solving the resulting constrained models. Our numerical results show that for some images where there are many pixels with values lying on the boundary of the dynamic range, the gain can be as great as 10.28 decibel in the peak signal-to-noise ratio. One traditional hindrance using the constrained model is that it is difficult to solve. However, in this paper, we propose using the alternating direction method of multipliers (ADMM) to solve the constrained models. This leads to a fast and convergent algorithm that is applicable for both Gaussian and impulse noise. Numerical results show that our ADMM algorithm is better than some state-of-the-art algorithms for unconstrained models in terms of both accuracy and robustness with respect to the regularization parameter.
total variation, deblurring, alternating direction method of multipliers, box constraint
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@inproceedings{raymond2013constrained,
  title={Constrained Total Variation Deblurring Models and Fast Algorithms Based on Alternating Direction Method of Multipliers},
  author={Raymond H. Chan, Min Tao, and Xiaoming Yuan},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170530125622913700758},
  booktitle={SIAM Journal on Imaging Sciences},
  volume={6},
  number={1},
  pages={680-697},
  year={2013},
}
Raymond H. Chan, Min Tao, and Xiaoming Yuan. Constrained Total Variation Deblurring Models and Fast Algorithms Based on Alternating Direction Method of Multipliers. 2013. Vol. 6. In SIAM Journal on Imaging Sciences. pp.680-697. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170530125622913700758.
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