Method and device for defogging single image

The invention is suitable for the technical field of digital image treatment and provides a method and device for defogging a single image. The method comprises the following steps: utilizing a preset number of template windows and an image pixel value to obtain a dark pixel image of a foggy image; obtaining a whole atmospheric optical value of the foggy image; obtaining a distribution image of atmospheric transmission transmissivity according to the dark pixel image and the whole atmospheric optical value of the foggy image; and treating the foggy image according to the whole atmospheric optical value, the distribution image of atmospheric transmission transmissivity and a defogging expression formula, thereby obtaining a defogged recovered image. According to the method provided by the invention, a template window corresponding to each pixel point is self-adaptively obtained; a dark pixel of a corresponding pixel point is obtained according to the template window corresponding to a minimum variance; the whole atmospheric optical value is estimated in a preset area; a foggy image imaging model, the defogging expression formula, and the like, are combined; and under the condition of ensuring the defogging effect, the calculated volume and storage volume are greatly reduced, the image processing efficiency is increased, and the like.