Towards Efficient and Scale-Robust Ultra-High-Definition Image Demoireing (ECCV 2022)
Xin Yu, Peng Dai, Wenbo Li, Lan Ma, Jiajun Shen, Jia Li, Xiaojuan Qi.
Paper(Coming soon), Project_page, Dataset

When photographing the contents displayed on the digital screen, an inevitable frequency aliasing between the camera’s color filter array (CFA) and the screen’s LCD subpixel widely exists. The captured images are thus mixed with colorful stripes, named moire patterns, which severely degrade images’ perceptual qualities. Although a plethora of dedicated demoire methods have been proposed in the research community recently, yet is still far from achieving promising results in the real-world scenes. The key limitation of these methods is that they all only conduct research on low-resolution or synthetic images. However, with the rapid development of mobile devices, modern widely-used mobile phones typically allow users to capture 4K resolution (i.e.,ultra-high-definition) images, and thus the effectiveness of these methods on this practical scenes is not promised. In this work, we explore moire pattern removal for ultra-high-definition images. First, we propose the first ultra-high-definition demoireing dataset (UHDM), which contains 5,000 real-world 4K resolution image pair, and conduct a benchmark study on the current state of the art. Then, we analyze limitations of the state of the art and summarize the key issue of them, i.e., not scale-robust. To address their deficiencies, we deliver a plug-and-play semantic-aligned scale-aware module which helps us to build a frustratingly simple baseline model for tackling 4K moire images. Our framework is easy to implement and fast for inference, achieving state-of-the-art results on four demoireing datasets while being much more lightweight. We hope our investigation could inspire more future research in this more practical setting in image demoireing.

First you have to make sure that you have installed all dependencies. To do so, you can create an anaconda environment called esdnet using

conda env create -f environment.yaml
conda activate esdnet

Our implementation has been tested on one NVIDIA 3090 GPU with cuda 11.2.

We provide the 4K dataset UHDM for you to evaluate a pretrained model or train a new model. To this end, you can download them here, or you can simply run the following command for automatic data downloading:

bash scripts/download_data.sh

Then the dataset will be available in the folder uhdm_data/.

To train a model from scratch, simply run:

python train.py --config CONFIG.yaml

where you replace CONFIG.yaml with the name of the configuration file you want to use. We have included configuration files for each dataset under the folder config/.

For example, if you want to train our lightweight model ESDNet on UHDM dataset, run:

python train.py --config ./config/uhdm_config.yaml

To test a model, you can also simply run:

python test.py --config CONFIG.yaml

where you need to specify the value of TEST_EPOCH in the CONFIG.yaml to evaluate a model trained after specific epochs, or you can also specify the value of LOAD_PATH to directly load a pre-trained checkpoint.

We provide pre-trained models here. To download the checkpoints, you can also simply run:

bash scripts/download_model.sh

Then the checkpoints will be included in the folder pretrain_model/.

If you have any questions, you can email me ([email protected]).