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Image restoration aims to reconstruct a high-quality image from its corrupted version, playing essential roles in many scenarios.Recent years have witnessed a paradigm shift in image restoration from convolutional neural networks (CNNs) to Transformerbased models due to their powerful ability to model long-range pixel interactions.In this paper, we explore the potential of CNNs for image restoration and show that the proposed simple convolutional network architecture, termed ConvIR, can perform on par with or better than the Transformer counterparts.By re-examing the characteristics of advanced image restoration algorithms, we discover several key factors leading to the performance improvement of restoration models.This motivates us to develop a novel network for image restoration based on cheap convolution operators.Comprehensive experiments demonstrate that our ConvIR delivers state-ofthe-art performance with low computation complexity among 20 benchmark datasets on five representative image restoration tasks, including image dehazing, image motion/defocus deblurring, image deraining, and image desnowing.
Cui et al. (Tue,) studied this question.