Scene visibility is very low in foggy days We need to defog the surveillance video to make sure the intelligent visual surveillance system work normally According to optics theory

the reduction of scene visibility is exponential to the scene depth The defog effect of existing model based methods are not good enough In this paper

a new physics based method of image restoration is presented This method models scene points in foggy day firstly Then the scene depth is calculated for two images which are captured in clear day and foggy day respectively Image or video taken in foggy day is restored using depth information finally The experiments demonstrate the effectiveness and practicality of this method