# Physics-Based Generative Adversarial Models for Image Restoration and Beyond

Jinshan Pan    Jiangxin Dong    Yang Liu     Jiawei Zhang    Jimmy Ren    Jinhui Tang     Yu-Wing Tai    Ming-Hsuan Yang

Abstract

We present an algorithm to directly solve numerous image restoration problems (e.g., image deblurring, image dehazing, image deraining, etc.). These problems are highly ill-posed, and the common assumptions for existing methods are usually based on heuristic image priors. In this paper, we find that these problems can be solved by generative models with adversarial learning. However, the basic formulation of generative adversarial networks (GANs) does not generate realistic images, and some structures of the estimated images are usually not preserved well. Motivated by an interesting observation that the estimated results should be consistent with the observed inputs under the physics models, we propose a physics model constrained learning algorithm so that it can guide the estimation of the specific task in the conventional GAN framework. The proposed algorithm is trained in an end-to-end fashion and can be applied to a variety of image restoration and related low-level vision problems. Extensive experiments demonstrate that our method performs favorably against state-of-the-art algorithms.

Image Deblurring

 Blurred image Hradiš et al. Ours Blurred image DeblurGAN Ours Blurred image Pan et al. Ours

Image Dehazing

 Hazy image GAN dehazing Ours

Image Deraining

 Rainy image GAN deraining Ours

Some applications in image restoration. Our method is motivated by a key observation that the restored results should be consistent with the observed inputs under the degradation process (i.e., physics model). With the physics model constraint in the training stage, the proposed end-to-end trainable network is not totally blind and is able to generate physically correct results. It can be applied to several image restoration and related low-level vision problems and performs favorably against state-of-the-art algorithms.

Proposed Algorithm

 The proposed framework. The discriminative network $\mathcal{D}_g$ is used to classify whether the distributions of the outputs from the generator $\mathcal{G}$ are close to those of the ground truth images or not. The discriminative network $\mathcal{D}_h$ is used to classify whether the regenerated result $\widetilde{y}_i$ is consistent with the observed image $y_i$ or not. All the networks are jointly trained in an end-to-end manner.

Visual Comparisons

Image Deblurring

 Blurred image Xu et al. Pan et al. (TPAMI 2017) Pan et al. (CVPR 2016) Nah et al. Hradiš et al. PCycleGAN Ours Blurred image Xu et al. Pan et al. (TPAMI 2017) Pan et al. (ECCV 2014) Zhang et al. DeblurGAN CycleGAN Ours
 Blurred image Xu et al. Pan et al. (TPAMI 2017) Pan et al. (ECCV 2014) Zhang et al. DeblurGAN PCycleGAN Ours

Image Dehazing

 Hazy image He et al. Meng et al. Berman et al. Chen et al. Cai et al. Ren et al. Ours

Image Deraining

 Rainy image Li et al. Zhang et al. Fu et al. Yang et al. pix2pix CycleGAN Ours

Technical Papers, Codes, and Datasets

Jinshan Pan, Jiangxin Dong, Yang Liu, Jiawei Zhang, Jimmy Ren, Jinhui Tang, Yu-Wing Tai and Ming-Hsuan Yang, "Physics-Based Generative Adversarial Models for Image Restoration and Beyond", IEEE Transactions on Pattern Analysis and Machine Intelligence (IEEE TPAMI), 2020.

Paper

Supplemental material

Source code

Datasets comming soon...

References

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