Deep wavelet network with domain adaptation for single image demoireing

Convolutional neural networks have made a prominent progress in low-level image restoration tasks. Moire is a kind of high-frequency and irregular interference stripe that appears on the photosensitive element of digital cameras or scanners. It can bring in unpleasant colorful artifacts on images. In this paper, we propose a deep wavelet network with domain adaptation mechanism for single image demoireing, dubbed AWUDN. The feature mapping is mainly performed in the wavelet domain, which can not only cut down computation complexity, but also reduce information loss. Moreover, considering that the images provided by the challenge organizers have strong self-similarity, the global context block is adopted for the learning of feature dependency in different positions. Finally, we introduce the domain adaptation mechanism to fine-tune the pretrained model for reducing the domain gap between training moire dataset and testing moire dataset. Benefiting from these improvements, the proposed method can achieve superior accuracy on the public testing dataset in the NTIRE 2020 Single Image Demoireing Challenge.