Abstract: In recent world scenario digital image processing is the most widely used application. Digital image processing is the method to perform some operation on the image, in order to get an enhanced image and extract the useful information from that image. Mostly in winter season the visibility of outdoor images captured in inclement weather is often degraded due to the presence of fog. Because of this problem clear image is not obtained. In this paper, the proposed method uses the dark channel prior and histogram stretching methods for digital image defogging. Whereas dark channel prior is used to improve the quality of restoring images and histogram stretching method is used to improve the contrast of the image. Also analysis on various fog removal techniques has been done.

Keywords: Image processing, defogging, dark channel prior, histogram stretching method.