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An Image Arbitrary-Scale Super-Resolution Network Using Frequency-domain Information

Published: 10 November 2023 Publication History

Abstract

Image super-resolution (SR) is a technique to recover lost high-frequency information in low-resolution (LR) images. Since spatial-domain information has been widely exploited, there is a new trend to involve frequency-domain information in SR tasks. Besides, image SR is typically application-oriented and various computer vision tasks call for image arbitrary magnification. Therefore, in this article, we study image features in the frequency domain to design a novel image arbitrary-scale SR network. First, we statistically analyze LR-HR image pairs of several datasets under different scale factors and find that the high-frequency spectra of different images under different scale factors suffer from different degrees of degradation, but the valid low-frequency spectra tend to be retained within a certain distribution range. Then, based on this finding, we devise an adaptive scale-aware feature division mechanism using deep reinforcement learning, which can accurately and adaptively divide the frequency spectrum into the low-frequency part to be retained and the high-frequency one to be recovered. Finally, we design a scale-aware feature recovery module to capture and fuse multi-level features for reconstructing the high-frequency spectrum at arbitrary scale factors. Extensive experiments on public datasets show the superiority of our method compared with state-of-the-art methods.

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Cited By

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  • (2024)Enhanced local distribution learning for real image super-resolutionComputer Vision and Image Understanding10.1016/j.cviu.2024.104092247(104092)Online publication date: Oct-2024

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Published In

cover image ACM Transactions on Multimedia Computing, Communications, and Applications
ACM Transactions on Multimedia Computing, Communications, and Applications  Volume 20, Issue 3
March 2024
665 pages
EISSN:1551-6865
DOI:10.1145/3613614
  • Editor:
  • Abdulmotaleb El Saddik
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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 10 November 2023
Online AM: 16 August 2023
Accepted: 10 August 2023
Revised: 07 August 2023
Received: 06 February 2023
Published in TOMM Volume 20, Issue 3

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  1. Super-resolution
  2. image frequency domain
  3. arbitrary magnification
  4. deep reinforcement learning

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  • National Natural Science Foundation of China (NSFC)

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  • (2024)Enhanced local distribution learning for real image super-resolutionComputer Vision and Image Understanding10.1016/j.cviu.2024.104092247(104092)Online publication date: Oct-2024

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