Image dehazing using dark channel prior and the corrected transmission map

Single image dehazing based on dark channel prior may encounter color distortion in bright region (such as sky region). Three methods are proposed to overcome the limitations of original algorithm. A transmission threshold firstly was determined. Then, by using the threshold to correct the transmission map in different ways and make it adaptive to fog, three algorithms can effectively deal with the sky, white object and so on. In order to reduce the complexity of calculation, fast guider filter was applied to refining the transmission map. Experimental results showed that these methods are feasible to eliminate color distortion of out-door image, and visibility can be also enhanced.