In order to resolve the problem of the image degradation, an image enhancement\nmethod based on fractional calculus and Retinex is proposed,\nwhich can preserve or enhance texture information and remove the noise of\nimages. The fractional differential is used to preprocess the input image to\nenhance texture information, and using guided filter to estimate the illumination\ncomponent, so it has less halo phenomena. The reflection component,\nobtained according to the Retinex theory, is denoised by fractional integral to\nremove the noises. The image is equalized by the contrast limited adaptive\nhistogram equalization to improve the image contrast, and a final enhanced\nimage is obtained. The experimental results show that the method can effectively\nachieve image enhancement, and the enhanced image has better visual\neffects.
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