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Non-local Dehazing enhanced by color gradient

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Abstract

Ubiquitous visual surveillance is critical to public security. Unfortunately, adverse weathers, especially haze, degrade visual surveillance quality evidently, so dehazing is commonly used to limit the interference of haze. Unlike traditional dehazing methods that use various patch-based priors, non-local dehazing employs color index and regularization to estimate and refine initial transmission, respectively. However, currently non-local dehazing has not made the most of pixel neighborhood relation, so the edge details cannot be preserved powerfully. Since the gradient represents the difference between the adjacent pixels, the non-local dehazing algorithm is enhanced by color gradient in this paper. The color index and color gradient are jointly clustered to improve the accuracy of initial transmission. Finally the haze is removed according to the transmission refined by guided filter. The experimental results show that the proposed non-local dehazed algorithm enhanced by color gradient can effectively maintain the edge details and improve the performance of dehazing.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (61663031, 61741312, 61772255, 61763033), Key Research & Development Project of Jiangxi Province (20161BBE50085, 20171ACE50024), Construction Project of Advantage Scientific & Technological Innovation Team in Jiangxi Province (20165BCB19007), Construction Project of Advantage Scientific & Technological Innovation Team in Nanchang City, Application Innovation Program of Public Security Ministry (2017YYCXJXST048), Science and Technology Research Project of Education Department of Jiangxi Province (GJJ150715), Open Foundation of Key Laboratory of Jiangxi Province for Image Processing and Pattern Recognition (ET201680245, TX201604002), Ph.D Starting Foundation of Nanchang Hangkong University (EA201620045), Post-graduate Innovation Foundation of Jiangxi Province (YC2016021, YC2017095).

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Authors and Affiliations

  1. School of Software, Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China

    Jun Chu & Lu Leng

  2. Key Laboratory of Jiangxi Province for Image Processing and Pattern Recognition, Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China

    Jun Chu, Jia Luo & Lu Leng

  3. School of Information Engineering, Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China

    Jia Luo

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  1. Jun Chu
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  2. Jia Luo
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  3. Lu Leng
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Correspondence to Lu Leng.

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Chu, J., Luo, J. & Leng, L. Non-local Dehazing enhanced by color gradient. Multimed Tools Appl 78, 5701–5713 (2019). https://doi.org/10.1007/s11042-018-5673-6

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  • DOI: https://doi.org/10.1007/s11042-018-5673-6

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