D4: Self-augmented Unpaired Image Dehazing via Density and Depth Decomposition

This is the PyTorch implementation of the paper 'Self-augmented Unpaired Image Dehazing via Density and Depth Decomposition', which is accepted by CVPR2022.

Introduction

In this paper, we propose a self-augmented image dehazing framework, termed D4 (Dehazing via Decomposing transmission map into Density and Depth) for haze generation and removal. Instead of merely estimating transmission maps or clean content, the proposed framework focuses on exploring scattering coefficient and depth information contained in hazy and clean images. With estimated scene depth, our method is capable of re-rendering hazy images with different thicknesses which further benefits the training of the dehazing network.

Prerequisites

• Python 3.7 + Pytorch, please refer environment.yml for detiled requirments.

Datasets

1.Testing

We used SOTS-indoor, SOTS-outdoor and I-HAZE for testing.

After downloading the dataset, please use scripts/flist.py to generate the file lists. For example, to generate the training set file list on the SOTS-indoor testset, you should run:

python scripts/flist.py --path path_to_SOTS_indoor_hazy_path --output ./datasets/sots_test_hazy_indoor.flist

And then fill the path of ground truth images in the config file.

Please notice that the ground truth images of SOTS-indoor have additional white border, you can crop it first.

2.Training

For training, we used ITS dataset, you can follow the operations above to generate the training file lists.

python scripts/flist.py --path ITS_train_hazy_path --output ./datasets/its_train_hazy.flist
python scripts/flist.py --path ITS_train_gt_path --output ./datasets/its_train_gt.flist

Getting Started

To use the pre-trained models, download it from the following link then copy it to the corresponding checkpoints folder, like ./checkpoints/quick_test

Pretrained model

0.Quick Testing

To hold a quick-testing of our dehazing model, download our pre-trained model and put it into checkpoints/quick_test, then run:

python3 test.py --model 1 --checkpoints ./checkpoints/quick_test

and check the results in 'checkpoints/quick_test/results'

If you want to see the depth estimation and haze generation results, change the TEST_MODE term from pair_test to clean, then run the same command.

1.Training

1)Prepare the SOTS-indoor training datasets following the operations in the Dataset part. 2)Add a config file 'config.yml' in your checkpoints folder. We provide an example checkpoints folder and config file in ./checkpoints/train_example 3)Train the model, for example:

python train.py --model 1 --checkpoints ./checkpoints/train_example

2. Testing

1)Prepare the testing datasets following the operations in the Dataset part. 2)Put the trained weight in the checkpoint folder 2)Add a config file 'config.yml' in your checkpoints folder. We provide an example checkpoints folder and config file in ./checkpoints/test_example 3)Test the model, for example:

python test.py --model 1 --checkpoints ./checkpoints/test_example

Limitation

We found that our model is sensitive to training data. The training may be unstable on images that have a wide variation in depth.

Citation

if you find our work useful, please cite:

@inproceedings{yang2022self,
  title={Self-Augmented Unpaired Image Dehazing via Density and Depth Decomposition},
  author={Yang, Yang and Wang, Chaoyue and Liu, Risheng and Zhang, Lin and Guo, Xiaojie and Tao, Dacheng},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  pages={2037--2046},
  year={2022}
}