| Citation: | ZHANG Chi, TAN Nanlin, LI Xiang, et al. Foggy image enhancement technology based on improved Retinex algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(2): 309-316. doi: 10.13700/j.bh.1001-5965.2018.0316(in Chinese)
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In order to enhance the contrast, color and brightness constancy of foggy images, an improved Retinex algorithm of foggy image enhancement is proposed. The algorithm uses an improved bilateral filter as a filter function to remove the noise interference while maintaining the edge information. It uses the S-shape function curve to restore image color by subtracting the incident light component from the logarithmic domain in Retinex algorithm, enhances the contrast and the perceptual characteristics of the whole image, and restores the color information of the image. The experimental results show that the improved algorithm proposed in this paper can effectively improve the clarity and contrast of the foggy image. Compared with the original foggy image, the image clarity is raised by about 200%, the standard deviation is raised by about 110%, and the information entropy is raised by about 10%. At the same time, it can maintain more realistic color information, and the computational complexity is low, which meets the real-time requirements.
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