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Nested Multi-Axis Learning Network for Single Image Super-Resolution

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PRICAI 2022: Trends in Artificial Intelligence (PRICAI 2022)

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Abstract

Real-world images usually contain rich features at different granularity levels, such as illumination, edges, and textures. Performance of a deep-learning method for single image super-resolution (SISR) could be degraded if it fails to extract features over all granularity levels. To address this problem, a novel deep-learning network is proposed, which consists of a set of nested multi-axis learning blocks (NMLBs) and is thus termed the nested multi-axis learning network (NMLNet). Each NMLB has an outer multi-axis structure that contains 3 axes dedicated to extracting coarse-, medium-, and fine-grained features, respectively. With the concern that our human visual system is more sensitive to the medium-grained features (e.g., edges), the medium-grained axis further has an inner multi-axis structure, by which edge features are captured at a wide range of network depths. By transmitting image features via the nested multi-axis structure, efficient information propagation is achieved throughout our developed network. To boost the network performance, a two-tier attention block is also proposed, which adaptively rescales the extracted features in both channel and spatial domains to maximize the representation capacity of our network. Extensive experimental results show that the proposed NMLNet can deliver superior performance over a number of state-of-the-art SISR methods, especially with respect to the reconstruction quality of image edges.

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Acknowledgement

This work was supported in part by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China under Grant 21KJA520007, in part by the National Natural Science Foundation of China under Grant 61572341, in part by the Priority Academic Program Development of Jiangsu Higher Education Institutions, in part by Collaborative Innovation Center of Novel Software Technology and Industrialization.

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Correspondence to Baojiang Zhong .

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Xiao, X., Zhong, B. (2022). Nested Multi-Axis Learning Network for Single Image Super-Resolution. In: Khanna, S., Cao, J., Bai, Q., Xu, G. (eds) PRICAI 2022: Trends in Artificial Intelligence. PRICAI 2022. Lecture Notes in Computer Science, vol 13631. Springer, Cham. https://doi.org/10.1007/978-3-031-20868-3_36

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  • DOI: https://doi.org/10.1007/978-3-031-20868-3_36

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  • Publisher Name: Springer, Cham

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  • Online ISBN: 978-3-031-20868-3

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