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GLEAN (CVPR'2021)

GLEAN: Generative Latent Bank for Large-Factor Image Super-Resolution

Task: Image Super-Resolution

Abstract

We show that pre-trained Generative Adversarial Networks (GANs), e.g., StyleGAN, can be used as a latent bank to improve the restoration quality of large-factor image super-resolution (SR). While most existing SR approaches attempt to generate realistic textures through learning with adversarial loss, our method, Generative LatEnt bANk (GLEAN), goes beyond existing practices by directly leveraging rich and diverse priors encapsulated in a pre-trained GAN. But unlike prevalent GAN inversion methods that require expensive image-specific optimization at runtime, our approach only needs a single forward pass to generate the upscaled image. GLEAN can be easily incorporated in a simple encoder-bank-decoder architecture with multi-resolution skip connections. Switching the bank allows the method to deal with images from diverse categories, e.g., cat, building, human face, and car. Images upscaled by GLEAN show clear improvements in terms of fidelity and texture faithfulness in comparison to existing methods.

Results and models

For the meta info used in training and test, please refer to here. The results are evaluated on RGB channels.

Model Dataset PSNR Training Resources Download
glean_cat_8x LSUN-CAT 23.98 2 (Tesla V100-PCIE-32GB) model | log
glean_ffhq_16x FFHQ 26.91 2 (Tesla V100-PCIE-32GB) model | log
glean_cat_16x LSUN-CAT 20.88 2 (Tesla V100-PCIE-32GB) model | log
glean_in128out1024_4x2_300k_ffhq_celebahq FFHQ 27.94 4 (Tesla V100-SXM3-32GB) model | log
glean_fp16_cat_8x LSUN-CAT - - -
glean_fp16_ffhq_16x FFHQ - - -
glean_fp16_in128out1024_4x2_300k_ffhq_celebahq FFHQ - - -

Quick Start

Train

Train Instructions

You can use the following commands to train a model with cpu or single/multiple GPUs.

# cpu train
CUDA_VISIBLE_DEVICES=-1 python tools/train.py configs/glean/glean_x8_2xb8_cat.py

# single-gpu train
python tools/train.py configs/glean/glean_x8_2xb8_cat.py

# multi-gpu train
./tools/dist_train.sh configs/glean/glean_x8_2xb8_cat.py 8

For more details, you can refer to Train a model part in train_test.md.

Test

Test Instructions

You can use the following commands to test a model with cpu or single/multiple GPUs.

# cpu test
CUDA_VISIBLE_DEVICES=-1 python tools/test.py configs/glean/glean_x8_2xb8_cat.py https://download.openmmlab.com/mmediting/restorers/glean/glean_cat_8x_20210614-d3ac8683.pth

# single-gpu test
python tools/test.py configs/glean/glean_x8_2xb8_cat.py https://download.openmmlab.com/mmediting/restorers/glean/glean_cat_8x_20210614-d3ac8683.pth

# multi-gpu test
./tools/dist_test.sh configs/glean/glean_x8_2xb8_cat.py https://download.openmmlab.com/mmediting/restorers/glean/glean_cat_8x_20210614-d3ac8683.pth 8

For more details, you can refer to Test a pre-trained model part in train_test.md.

Citation

@InProceedings{chan2021glean,
  author = {Chan, Kelvin CK and Wang, Xintao and Xu, Xiangyu and Gu, Jinwei and Loy, Chen Change},
  title = {GLEAN: Generative Latent Bank for Large-Factor Image Super-Resolution},
  booktitle = {Proceedings of the IEEE conference on computer vision and pattern recognition},
  year = {2021}
}