Abstract
The invention discloses an image defogging method based on an improved dynamic atmospheric scattering coefficient function, and the method comprises the steps: solving a minimum channel image throughemploying R, G and B color channels of an original image, and calculating an atmospheric light value A of a foggy day image through a quadtree segmentation method; calculating the depth of field d (x)of the image by using a nonlinear color attenuation prior model, and filtering noise information in the depth of field d (x) of the image through minimum filtering, smooth filtering and guided filtering to obtain the final depth of field dr (x) of the image; and finally, in combination with the improved dynamic atmospheric scattering coefficient function beta (x) and the image depth of field dr (x) obtained through final processing, calculating atmospheric transmissivity t (x), and recovering a fog-free image through an atmospheric scattering model. The method not only can solve the problem of inaccurate transmissivity estimation caused by constant atmospheric scattering coefficient, but also can effectively solve the phenomenon of color distortion of the sky area of the image, so that the defogging effect of the image is clearer and more thorough, and the color of the scenery is more natural and real.
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