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Joint channel-spatial attention network for super-resolution image quality assessment

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Abstract

Image super-resolution (SR) is an effective technique to enhance the quality of LR images. However, one of the most fundamental problems for SR is to evaluate the quality of resultant images for comparing and optimizing the performance of SR algorithms. In this paper, we propose a novel deep network model referred to as a joint channel-spatial attention network (JCSAN) for no-reference SR image quality assessment (NR-SRIQA). The JCSAN consists of a two-stream branch which learns the middle level features and the primary level features to jointly quantify the degradation of SR images. In the first middle level feature learning subnetwork, we embed a two-stage convolutional block attention module (CBAM) to capture discriminative perceptual feature maps through the channel and spatial attention in sequence. While the other shallow convolutional subnetwork is adopted to learn dense and primary level textural feature maps. In order to yield more accurate quality estimate to SR images, we integrate a unit aggregation gate (AG) module to dynamically distribute the channel-weights to the two feature maps from different branches. Extensive experimental results on two benchmark datasets verify the superiority of the proposed JCSAN-based quality metric in comparing with other state-of-the-art competitors.

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Acknowledgments

This work was supported in part by the National Natural Science Foundation of China under Grant 61971339, Grant 61471161, and Grant 61972136, in part by the Textile Intelligent Equipment Information and Control Innovation Team of Shaanxi Innovation Ability Support Program under Grant 2021TD-29, in part by the Textile Intelligent Equipment Information and Control Innovation Team of Shaanxi Innovation Team of Universities, in part by the Key Project of the Natural Science Foundation of Shaanxi Province under Grant 2018JZ6002, and in part by the Doctoral Startup Foundation of Xi’an Polytechnic University under Grant BS1616.

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Correspondence to Kaibing Zhang.

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Zhang, T., Zhang, K., Xiao, C. et al. Joint channel-spatial attention network for super-resolution image quality assessment. Appl Intell 52, 17118–17132 (2022). https://doi.org/10.1007/s10489-022-03338-1

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