Attention Based Real Image Restoration

This repository is for Attention Based Real Image Restoration (R²Net) introduced in the following paper

Saeed Anwar, Nick Barnes, and Lars Petersson, "Attention Based Real Image Restoration", IEEE Transactions on Neural Networks and Learning Systems (TNNLS), 2021

Contents

1. Introduction
2. Requirements
3. Super-resolution
4. Rain-Removal
5. JPEG-Compression
6. Real-Denoising
7. Citation
8. Acknowledgements

Introduction

Deep convolutional neural networks perform better on images containing spatially invariant degradations, also known as synthetic degradations; however, their performance is limited on real-degraded photographs and requires multiple-stage network modeling. To advance the practicability of restoration algorithms, this paper proposes a novel single-stage blind real image restoration network (R²Net) by employing a modular architecture. We use a residual on the residual structure to ease low-frequency information flow and apply feature attention to exploit the channel dependencies. Furthermore, the evaluation in terms of quantitative metrics and visual quality for four restoration tasks, i.e., Denoising, Super-resolution, Raindrop Removal, and JPEG Compression on 11 real degraded datasets against more than 30 state-of-the-art algorithms demonstrate the superiority of our R²Net. We also present the comparison on three synthetically generated degraded datasets for denoising to showcase our method's capability on synthetics denoising.

Requirements

• PyTorch 0.4.0, PyTorch 0.4.1
• Tested on Ubuntu 14.04/16.04 environment
• torchvision=0.2.1
• python 3.6
• CUDA 9.0
• cuDNN 5.1
• imageio
• pillow
• matplotlib
• tqdm
• scikit-image

---

Super-resolution

The architecture for super-resolution.

SR Test

1. Download the trained models and code of our paper from here. The total size for all models is 240MB.

2. cd to '/R2NetSRTestCode/code', either run bash TestR2NET_2x.sh or bash TestR2NET_3x.sh or bash TestR2NET_4x.sh.

**or run the following individual commands and find the results in directory R2NET_SRResults.

**You can use the following script to test the algorithm.**

CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --scale 2 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_BIX2.pt --test_only --save_results --chop --save 'R2NET_Set5' --testpath ../LR/LRBI --testset Set5

CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --scale 2 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_BIX2.pt --test_only --save_results --chop --self_ensemble --save 'R2NETplus_Set5' --testpath ../LR/LRBI --testset Set5

#3x
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --scale 3 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_BIX3.pt --test_only --save_results --chop --save 'R2NET_Set14' --testpath ../LR/LRBI --testset Set14

CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --scale 3 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_BIX3.pt --test_only --save_results --chop --self_ensemble --save 'R2NETplus_Set14' --testpath ../LR/LRBI --testset Set14

#4x

CUDA_VISIBLE_DEVICES=5 python main.py --data_test MyImage --scale 4 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_BIX4.pt --test_only --save_results --chop --save 'R2NET_B100' --testpath ../LR/LRBI --testset BSD100

CUDA_VISIBLE_DEVICES=5 python main.py --data_test MyImage --scale 4 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_BIX4.pt --test_only --save_results --chop --self_ensemble --save 'R2NETplus_B100' --testpath ../LR/LRBI --testset BSD100

SR Results

All the results for SuperResolution R²Net can be downloaded from SET5 (2MB), SET5+ (2MB), SET14 (12.5MB), SET14+ (12MB), BSD100 (60MB), BSD100+ (60MB), Urban100 (315MB), and Urban100+ (308MB).

Visual Results

The visual comparisons for 4x super-resolution against several state-of-the-art algorithms on an image from Urban100 dataset. Our R²Ne results are the most accurate.

Quantitative Results

Mean PSNR and SSIM of the denoising methods evaluated on the real images dataset

The performance of super-resolution algorithms on Set5, Set14, BSD100, and URBAN100 datasets for upscaling factors of 2, 3, and 4. The bold highlighted results are the best on single image super-resolution.

---

Rain Removal

The architecture for Rain Removal and the subsequent restoration tasks. There are two modifications: the change in position of long skip connection and removal of upsampling layer.

RainRemoval Test

1. The trained models and code for rain removal can be downloaded from here. The total size for all models is 121.5MB.

2. cd to '/R2NetRainRemovalTestCode/code', either run bash TestScripts.sh or run the following individual commands and find the results in directory R2NET_DeRainResults.

   You can use the following script to test the algorithm.

# test_a
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --noise_g 1 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_RainRemoval.pt --test_only --save_results --save 'R2NET_test_a' --testpath ../rainy --testset test_a

# test_b
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --noise_g 1 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_RainRemoval.pt --test_only --save_results --save 'R2NET_test_b' --testpath ../rainy --testset test_b

RainRemoval Results

All the results for Rain Removal R²Net can be downloaded from here for both DeRain's test_a and test_b datasets.

Visual Results

The visual comparisons on rainy images. The first figure is showing the plate which is affected by raindrops. Our method is consistent in restoring raindrop affected areas. Similarly, in the second example of a rainy image, the cropped region is showing the road sign affected by raindrops. Our method recovers the distorted colors closer to the ground-truth.

Quantitative Results

The average PSNR(dB)/SSIM from different methods on raindrop dataset.

---

JPEG Compression

The architecture is same for the rest of restoration tasks.

JPEG Compression Test

1. Download the trained models and code for JPEG Compression of R²Net from Google Drive. The total size for all models is 43MB.**

2. cd to '/R2NetJPEGTestCode/code', either run bash TestScripts.sh or run the following individual commands and find the results in directory R2Net_Results.

   You can use the following script to test the algorithm.

# Q10
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --noise_g 10 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_Q10.pt --test_only --save_results --save 'R2NET_JPEGQ10' --testpath ../noisy --testset LIVE1

# Q20
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --noise_g 20 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_Q20.pt --test_only --save_results --save 'R2NET_JPEGQ20' --testpath ../noisy --testset LIVE1

# Q30
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --noise_g 30 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_Q30.pt --test_only --save_results --save 'R2NET_JPEGQ30' --testpath ../noisy --testset LIVE1

# Q40
CUDA_VISIBLE_DEVICES=0 python main.py --data_test MyImage --noise_g 40 --model R2NET --n_feats 64 --pre_train ../trained_models/R2Net_Q40.pt --test_only --save_results --save 'R2NET_JPEGQ40' --testpath ../noisy --testset LIVE1

JPEG Compression Results

If you don't want to re-run the models and save some computation, then all the results for JPEG Compression R²Net can be downloaded from LIVE1 (51.5MB).

Visual Results