Zongsheng Yue, Jianyi Wang, Chen Change Loy

Conference Paper | Journal Paper | Project Page | Video

⭐ If ResShift is helpful to your images or projects, please help star this repo. Thanks! 🤗

Diffusion-based image super-resolution (SR) methods are mainly limited by the low inference speed due to the requirements of hundreds or even thousands of sampling steps. Existing acceleration sampling techniques inevitably sacrifice performance to some extent, leading to over-blurry SR results. To address this issue, we propose a novel and efficient diffusion model for SR that significantly reduces the number of diffusion steps, thereby eliminating the need for post-acceleration during inference and its associated performance deterioration. Our method constructs a Markov chain that transfers between the high-resolution image and the low-resolution image by shifting the residual between them, substantially improving the transition efficiency. Additionally, an elaborate noise schedule is developed to flexibly control the shifting speed and the noise strength during the diffusion process. Extensive experiments demonstrate that the proposed method obtains superior or at least comparable performance to current state-of-the-art methods on both synthetic and real-world datasets, even only with 15 sampling steps.

• 2024.09.13: Our extended journal version has beed accepted by TPAMI@2024. We add the training and testing code for deblurring.
• 2024.03.11: Update the code for the Journal paper
• 2023.12.02: Add configurations for the x2 super-resolution task.
• 2023.08.15: Add .
• 2023.08.15: Add Gradio Demo.
• 2023.08.14: Add bicubic (matlab resize) model.
• 2023.08.14: Add Project Page.
• 2023.08.02: Add Replicate demo .
• 2023.07.31: Add Colab demo .
• 2023.07.24: Create this repo.

• Python 3.10, Pytorch 2.1.2, xformers 0.0.23
• More detail (See environment.yml) A suitable conda environment named resshift can be created and activated with:

conda create -n resshift python=3.10
conda activate resshift
pip install -r requirements.txt

or

conda env create -f environment.yml
conda activate resshift

You can try our method through an online demo:

python app.py

python inference_resshift.py -i [image folder/image path] -o [result folder] --task realsr --scale 4 --version v3

python inference_resshift.py -i [image folder/image path] -o [result folder] --task bicsr --scale 4

python inference_resshift.py -i [image folder/image path] -o [result folder] --task deblur --scale 1 

python inference_resshift.py -i [image folder/image path] -o [result folder] --mask_path [mask path] --task inpaint_imagenet --scale 1

python inference_resshift.py -i [image folder/image path] -o [result folder] --mask_path [mask path] --task inpaint_face --scale 1

python inference_resshift.py -i [image folder/image path] -o [result folder] --task faceir --scale 1

1. Download the pre-trained VQGAN model from this link and put it in the folder of 'weights'
2. Adjust the data path in the config file.
3. Adjust batchsize according your GPUS.
   • configs.train.batch: [training batchsize, validation batchsize]
   • configs.train.microbatch: total batchsize = microbatch * #GPUS * num_grad_accumulation

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 torchrun --standalone --nproc_per_node=8 --nnodes=1 main.py --cfg_path configs/realsr_swinunet_realesrgan256.yaml --save_dir [Logging Folder] 

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 torchrun --standalone --nproc_per_node=8 --nnodes=1 main.py --cfg_path configs/realsr_swinunet_realesrgan256_journal.yaml --save_dir [Logging Folder] 

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 torchrun --standalone --nproc_per_node=8 --nnodes=1 main.py --cfg_path configs/deblur_gopro256.yaml --save_dir [Logging Folder] 

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 torchrun --standalone --nproc_per_node=8 --nnodes=1 main.py --cfg_path configs/inpaint_lama256_imagenet.yaml --save_dir [Logging Folder] 

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 torchrun --standalone --nproc_per_node=8 --nnodes=1 main.py --cfg_path configs/inpaint_lama256_face.yaml --save_dir [Logging Folder] 

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 torchrun --standalone --nproc_per_node=8 --nnodes=1 main.py --cfg_path configs/faceir_gfpgan512_lpips.yaml --save_dir [Logging Folder] 

• Synthetic data for image super-resolution: Link

• Real data for image super-resolution: RealSet65 | RealSet80

• Synthetic data for natural image inpainting: Link

• Synthetic data for face image inpainting: Link

• Synthetic data for blind face restoration: Link

Reproduce the results in Table 3 of our NeurIPS paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --task realsr --scale 4 --version v1 --chop_size 64 --chop_stride 64 --bs 64

Reproduce the results in Table 4 of our NeurIPS paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --task realsr --scale 4 --version v1 --chop_size 512 --chop_stride 448

Reproduce the results in Table 2 of our Journal paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --task realsr --scale 4 --version v3 --chop_size 64 --chop_stride 64 --bs 64

Reproduce the results in Table 3 of our Journal paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --task realsr --scale 4 --version v3 --chop_size 512 --chop_stride 448

• version-1: Conference paper, 15 diffusion steps, trained with 300k iterations.
• version-2: Conference paper, 15 diffusion steps, trained with 500k iterations.
• version-3: Journal paper, 4 diffusion steps.

Reproduce the results in Table 4 of our Journal paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --mask_path [mask path] --task inpaint_imagenet --scale 1 --chop_size 256 --chop_stride 256 --bs 32

Reproduce the results in Table 5 of our Journal paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --mask_path [mask path] --task inpaint_face --scale 1 --chop_size 256 --chop_stride 256 --bs 32

Reproduce the results in Table 6 of our Journal paper:

python inference_resshift.py -i [image folder/image path] -o [result folder] --task faceir --scale 1 --chop_size 256 --chop_stride 256 --bs 16

This project is licensed under NTU S-Lab License 1.0. Redistribution and use should follow this license.

This project is based on Improved Diffusion Model, LDM, and BasicSR. We also adopt Real-ESRGAN to synthesize the training data for real-world super-resolution. Thanks for their awesome works.

If you have any questions, please feel free to contact me via zsyzam@gmail.com.