Image Restoration Through Generalized Ornstein-Uhlenbeck Bridge

Official PyTorch Implementations of GOUB, a diffusion bridge model that applies the Doob's h-transform to the generalized Ornstein-Uhlenbeck process. This model can address general image restoration tasks without the need for specific prior knowledge.

Overview

Visual Results

Intallation

This code is developed with Python3, and we recommend python>=3.8 and PyTorch ==1.13.0. Install the dependencies with Anaconda and activate the environment with:

conda create --name GOUB python=3.8
conda activate GOUB
pip install -r requirements.txt

Test

1. Prepare datasets.
2. Download pretrained checkpoints here.
3. Modify options, including dataroot_GT, dataroot_LQ and pretrain_model_G.
4. Choose a model to sample (Default: GOUB): test function in codes/models/denoising_model.py.
5. python test.py -opt=options/test.yml

The Test results will be saved in \results.

Train

1. Prepare datasets.
2. Modify options, including dataroot_GT, dataroot_LQ.
3. python train.py -opt=options/train.yml for single GPU.
   python -m torch.distributed.launch --nproc_per_node=2 --master_port=1111 train.py -opt=options/train.yml --launcher pytorch for multi GPUs. Attention: see Important Option Details.

The Training log will be saved in \experiments.

Interface

We provide the interface.py for the deraining, which can generate HQ only with LQ:

1. Prepare options/test.yml filling in LQ path.
2. python interface.py.
3. The interface will be on the local server: 127.0.0.1.

Other tasks can also be written in imitation.

Important Option Details

• dataroot_GT: Ground Truth (High-Quality) data path.
• dataroot_LQ: Low-Quality data path.
• pretrain_model_G: Pretraind model path.
• GT_size, LQ_size: Size of the data cropped during training.
• niter: Total training iterations.
• val_freq: Frequency of validation during training.
• save_checkpoint_freq: Frequency of saving checkpoint during training.
• gpu_ids: In multi-GPU training, GPU ids are separated by commas in multi-gpu training.
• batch_size: In multi-GPU training, must satisfy relation: batch_size/num_gpu>1.

FID

We provid a brief guidelines for commputing FID of two set of images:

1. Install FID library: pip install pytorch-fid.
2. Commpute FID: python -m pytorch_fid GT_images_file_path generated_images_file_path --batch-size 1
   if all the images are the same size, you can remove --batch-size 1 to accelerate commputing.