The present invention provides a method for providing an image having visibility which is improved by removing fog or smoke from an image of which the quality is reduced due to the fog or the smoke. To this end, the present invention provides an estimation model used for obtaining, from an input image, an image from which the fog is removed, calculates a transmission rate indicating a ratio by which the fog is included in the original image by using the estimation model, and obtains an image of which the fog is removed using the calculated transmission rate. The method proposed in the present invention does not commonly use a filter and only uses calculation of a pixel unit, so that a back lighting effect is not generated, real time processing is possible due to a small amount of calculation, and a good image is obtained even by performing a process using only a luminance image. Therefore, the method can be applied to all multimedia devices in which real time processing is required, such as a monitoring system, a black box, a digital camera, etc.