It is based on a key observation most local patches in haze-free outdoor images contain some pixels which have very low intensities in at least one color channel.
Last, the haze removal can produce depth information and benefit many vision algorithms and advanced image editing. Haze or fog can be a useful depth clue for scene understanding. The bad haze image can be put to good use.
我们可以简单的将$\mathbf{x}$理解为图像中的某一个位置,那么,$\mathbf{I}(\mathbf{x})$则是我们最终观察到的有雾的图像在该点的强度;$\mathbf{J}(\mathbf{x})$是在没有雾的情况下,该点应有的强度;$t(\mathbf{x})$是该点的透射率(the medium transmission describing the portion of the light that is not scat- tered and reaches the camera);最后,$\mathbf{A}$是全局大气光强(global atmospheric light)。