Fog rectification reference algorithm
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Muhammad Bilal
el 14 de Oct. de 2022
Comentada: Maruthi Bhatlapenumarti
el 28 de Oct. de 2022
Hi, Could someone please direct me towards the reference/publication to justify the equations used in the fog rectification example?
Usually, Matlab examples cite reference works at the end of the documentation page but this one does not list any. I am curious because the equations seem to be quite different from what some well-known works in the literature use. Eg. the example seems to use the same factor for both airlight and transmission. What surprises me even more is that the example seems to work for certain images albeit after setting some empirically derived coefficients. Thanks
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Bharathi Yogaraj
el 18 de Oct. de 2022
Here are references for Fog rectification example:
1. He, Kaiming. "Single Image Haze Removal Using Dark Channel Prior." Thesis, The Chinese University of Hong Kong. 2011.
2. Dubok, et al. "Single Image Dehazing with Image Entropy and Information Fidelity." ICIP. 2014, pp. 4037–4041.
Please let us know if you need more information on the same.
Thanks!
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Maruthi Bhatlapenumarti
el 28 de Oct. de 2022
We have used dark channel prior for airlight estimation and bilateral filter for airlight refinement. Here is the reference:
Wei Sun, A new single-image fog removal algorithm based on physical model, Optik, Volume 124, Issue 21, 2013, Pages 4770-4775, ISSN 0030-4026.(https://www.sciencedirect.com/science/article/pii/S0030402613002866)
For contrast enhancement, you can use CLAHE, but here to keep it simple we have used basic histogram stretching. Basic contrast stretching is: https://theailearner.com/2019/01/30/contrast-stretching/
Hope that helps!
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