Code for the paper "Gradient Step Denoiser for convergent Plug-and-Play" published at ICLR 2022.

[Paper]

Samuel Hurault, Arthur Leclaire, Nicolas Papadakis.
Institut de Mathématiques de Bordeaux, France.

The code was computed with Python 3.8.10, PyTorch Lightning 1.2.6, PyTorch 1.7.1

pip install -r requirements.txt

The code relative to the Gradient Step Denoiser can be found in the GS_denoising directory.

• Download training dataset from https://plmbox.math.cnrs.fr/f/4f56db2f0f7d49a88663/?dl=1 and unzip DRUNET in the datasets folder
• Realize training

cd GS_denoising
python main_train.py --name experiment_name --log_folder logs

Checkpoints, tensorboard events and hyperparameters will be saved in the GS_denoising/logs/experiment_name subfolder.

For denoising grayscale images, add the argument --grayscale

• Download pretrained checkpoint https://plmbox.math.cnrs.fr/f/ab6829cb933743848bef/?dl=1 for color denoising or https://plmbox.math.cnrs.fr/f/04318d36824443a6bf8d/?dl=1 for grayscale denoising and save it as GS_denoising/ckpts/GSDRUNet.ckpt

• For denoising a single (clean) image IMAGE_PATH, taht will be noised with input Gaussian noise level NOISE_LEVEL (int $\in [0,255]$) :

cd PnP_restoration
python denoise.py --image_path IMAGE_PATH --noise_level_img NOISE_LEVEL

• For denoising a set of (clean) images. Place your images in directory datasets/DATASET_NAME

cd PnP_restoration
python denoise.py --dataset_name DATASET_NAME

Datasets CBSD68, CBSD10, set3c are already present in the directory. Default value is CBSD10.

• Download pretrained checkpoint https://plmbox.math.cnrs.fr/f/ab6829cb933743848bef/?dl=1 for color denoising or https://plmbox.math.cnrs.fr/f/04318d36824443a6bf8d/?dl=1 for grayscale denoising and save it as GS_denoising/ckpts/GSDRUNet.ckpt

• For deblurring an input (clean) image IMAGE_PATH, that we blur with kernel saved at KERNEL_PATH (saved as .npy) and with input Gaussian noise level NOISE_LEVEL (int $\in [0,255]$)

cd PnP_restoration
python deblur.py --image_path IMAGE_PATH --kernel_path KERNEL_PATH --noise_level_img NOISE_LEVEL

By default, without specifying --kernel_path , deblurring will be performed on the 10 kernels evaluated in the paper. You can specify --kernel_index to choose a specific kernel in this list.

You can also specify --dataset_name to treat a set of images places in in directory datasets/DATASET_NAME

Add the argument --extract_curves the save convergence curves.

For performing super-resolution of the input image IMAGE_PATH, downscaled with scale sf, Gaussian noise level NOISE_LEVEL (int $\in [0,255]$)

cd PnP_restoration
python SR.py --noise_level_img NOISE_LEVEL --sf 2

By default, without specifying --kernel_path , deblurring will be performed on the 8 kernels evaluated in the paper. You can specify --kernel_index to choose a specific kernel in this list.

You can also specify --dataset_name to treat a set of images places in in directory datasets/DATASET_NAME

Add the argument --extract_curves the save convergence curves.

Inpainting with randomly masked pixels (with probability prop_mask = 0.5) :

cd PnP_restoration
python inpaint.py --prop_mask 0.5

Add the argument --extract_curves the save convergence curves.

This repo contains parts of code taken from :

• Deep Plug-and-Play Image Restoration (DPIR) : https://github.com/cszn/DPIR

@inproceedings{
hurault2022gradient,
title={Gradient Step Denoiser for convergent Plug-and-Play},
author={Samuel Hurault and Arthur Leclaire and Nicolas Papadakis},
booktitle={International Conference on Learning Representations},
year={2022},
url={https://openreview.net/forum?id=fPhKeld3Okz}
}