An improved image dehazing method based on dark channel compensation and guided filtering

Yueyuan Liu; Yishu Zhai

doi:10.1117/12.2636938

29 April 2022 An improved image dehazing method based on dark channel compensation and guided filtering

Yueyuan Liu, Yishu Zhai

Proceedings Volume 12247, International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2022); 122470M (2022) https://doi.org/10.1117/12.2636938
Event: 2022 International Conference on Image, Signal Processing, and Pattern Recognition, 2022, Guilin, China

Abstract

Image dehazing is an important topic in the field of computer vision. The traditional single image dehazing algorithm is susceptible to the serious halo phenomenon and color distortion. For this problem, an improved method for single image dehazing based on dark channel prior and guided filtering is proposed in this paper. Aiming at the problems of halo phenomenon by traditional dark channel prior, a compensation model was proposed firstly. This model identified halo regions by the differential operation on the two minimal filtered images and adjusted the filtering window scale to a more suitable value. Secondly, rough transmittance correction combined with sky area judgement was applied aiming at color degradation caused by serious cover influence of fog and haze. Finally, the guided filter algorithm was improved for optimal transmittance by locating edge points with Canny operator and modifying the smoothing factor in loss function with the ratio of the gradient operator to window gradient mean as edge weight. The experimental results demonstrate that the proposed algorithm can efficiently remove halo effects and keep more details whatever in near or far regions, as well as improving visual effects and color saturation of images. Objective experiment evaluations also verify the effectiveness of proposed algorithm.

Citation Download Citation

Yueyuan Liu and Yishu Zhai "An improved image dehazing method based on dark channel compensation and guided filtering", Proc. SPIE 12247, International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2022), 122470M (29 April 2022); https://doi.org/10.1117/12.2636938

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KEYWORDS

Image filtering

Transmittance

Atmospheric modeling

Image restoration

Image transmission

RGB color model

Distortion

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