Efficient Multi-scale Network with Learnable Discrete Wavelet Transform for Blind Motion Deblurring
Authors: Xin Gao, Tianheng Qiu, Xinyu Zhang, Hanlin Bai, Kang Liu, Xuan Huang, Hu Wei, Guoying Zhang, Huaping Liu

Coarse-to-fine schemes are widely used in traditional single-image motion deblur; however in the context of deep learning existing multi-scale algorithms not only require the use of complex modules for feature fusion of low-scale RGB images and deep semantics but also manually generate low-resolution pairs of images that do not have sufficient confidence. In this work we propose a multi-scale network based on single-input and multiple-outputs(SIMO) for motion deblurring. This simplifies the complexity of algorithms based on a coarse-to-fine scheme. To alleviate restoration defects impacting detail information brought about by using a multi-scale architecture we combine the characteristics of real-world blurring trajectories with a learnable wavelet transform module to focus on the directional continuity and frequency features of the step-by-step transitions between blurred images to sharp images. In conclusion we propose a multi-scale network with a learnable discrete wavelet transform (MLWNet) which exhibits state-of-the-art performance on multiple real-world deblurred datasets in terms of both subjective and objective quality as well as computational efficiency.