Abstract
This paper presents a novel image defogging algorithm using fractional-order anisotropic diffusion equation. The proposed algorithm uses the airlight map extracted from the foggy model as the initial image in the anisotropic diffusion process. The iterative diffusion process improves this airlight map. The anisotropic diffusion process is generalized to the order of any real number between [1, 2) using the Riemann-Liouville definition of the fractional order derivatives. The formulation of the iterative process is carried out in the spatial domain to have a simple and computationally efficient implementation. Simulation results validate that the proposed algorithm is outperforming over few of the existing algorithms. The comparison study is carried out using different metrics like contrast gain, colorfulness index, contrast-to-noise ratio and visible edges ratio.



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Acknowledgements
This work is partially supported by the Indian Space Research organization through their RESPOND scheme. One of the authors Savita Nandal is also thankful to Ministry of Human Resources and Development for financial support for carrying out her Ph.D. work.
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Nandal, S., Kumar, S. Single image fog removal algorithm in spatial domain using fractional order anisotropic diffusion. Multimed Tools Appl 78, 10717–10732 (2019). https://doi.org/10.1007/s11042-018-6576-2
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DOI: https://doi.org/10.1007/s11042-018-6576-2