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Research Article | Open Access

Deep unfolding multi-scale regularizer network for image denoising

School of Mathematics, Jilin University, Changchun 130012, China
National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China
School of Artificial Intelligence, University of Chinese Academy of Sciences, Beijing 100049, China
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Graphical Abstract

Abstract

Existing deep unfolding methods unroll an optimization algorithm with a fixed number of steps, and utilize convolutional neural networks (CNNs) to learn data-driven priors. However, their performance is limited for two main reasons. Firstly, priors learned in deep feature space need to be converted to the image space at each iteration step, which limits the depth of CNNs and prevents CNNs from exploiting contextual information. Secondly, existing methods only learn deep priors at the single full-resolution scale, so ignore the benefits of multi-scale context in dealing with high level noise. To address these issues, we explicitly consider the image denoising process in the deep feature space and propose the deep unfolding multi-scale regularizer network (DUMRN) for image denoising. The core of DUMRN is the feature-based denoising module (FDM) that directly removes noise in the deep feature space. In each FDM, we construct a multi-scale regularizer block to learn deep prior information from multi-resolution features. We build the DUMRN by stacking a sequence of FDMs and train it in an end-to-end manner. Experimental results on synthetic and real-world benchmarks demonstrate that DUMRN performs favorably compared to state-of-the-art methods.

Keywords

image denoisingdeep unfolding networkmulti-scale regularizerdeep learning

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Computational Visual Media
Volume 9 Issue 2,
June 2023
Pages 335-350
DOI: 10.1007/s41095-022-0277-5
Cite this article:
Xu J, Yuan M, Yan D-M, et al. Deep unfolding multi-scale regularizer network for image denoising. Computational Visual Media, 2023, 9(2): 335-350. https://doi.org/10.1007/s41095-022-0277-5

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Received: 12 January 2022
Accepted: 22 February 2022
Published: 03 January 2023
© The Author(s) 2022.

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