Image defogging recovery method and device and computer equipment

The embodiment of the invention discloses a defogging recovery method, which comprises the following steps of: receiving input original image information, obtaining dark channel image information of the original image information and a depth-of-field map of the original image information, and obtaining a filtered light transmission map according to the dark channel image information and a guided filtering calculation strategy; then, according to the original image information, the filtered light transmission image and the depth-of-field image, a defogging recovery image of the original image information is obtained according to a projection light prediction and defogging recovery calculation strategy, the depth-of-field mapping image is used in a combined mode as input information, errors and sky effects generated when image dark channel information is independently used for calculating the light transmission image can be reduced, and the image quality is improved. Meanwhile, depth-of-field information of the