Sand dust image data

To evaluate whether our proposed method can obtain the closest image to its corresponding original one, we construct a sand-dust image set in this section. Our original images come from O-HAZE\cite{IEEECVPROHAZE:Ancuti}, which is a public haze image set that consists of pairs of haze/haze-free images. Although sand-dust images are similar to hazy images with respect to some optical characteristics, such as atmospheric scattering and absorption, the optical imaging process is more intricate in the sand-dust environment than that in the haze environment. The most obvious difference between them is that sand-dust images usually have an overall yellow tone. Therefore, for simplicity, we model the sand-dust condition only by changing the color tone of hazed images in O-HAZE. Adobe Photoshop is used and we try different kinds of parameters to make the hazed image color tone fit the result in sand-dust conditions. Finally, we resize these images to $400×600$ and convert them to the Portable Network Graphics format.