In the ablation study, three experi

In the ablation study, three experiments are conducted to show the effects of SSIM loss function, as can be seen from the images below, (a) is the clear image or ground truth image, (b) is the rainy image (c) is conducted by only using L2 loss and adversarial loss, (d) is conducted by only using perceptual loss and adversarial loss, (e) is conducted using L2 loss, adversarial loss, perceptual loss, and SSIM loss, the images below them is the corresponding zoom-in. The results show that by applying L2 loss, an unexpected spot shows up along with the block effect in the sky area(can be seen in the transition of leaves and sky). By applying perceptual loss, more high-frequency noise is obtained and the image appears sharper, the texture of images is obvious, which can be seen in the (d). After applying the SSIM loss function, the unexpected spot is gone along with the texture noise in the sky area, the internal colour is also learned as it is more alike with the original image compares with (c) and (d).