Hyperspectral Image Super-Resolution via Deep Progressive Zero-Centric Residual Learning

Zhiyu Zhu, Junhui Hou*, Jie CHEN, Huanqiang Zeng, Jiantao Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper explores the problem of hyperspectral image (HSI) super-resolution that merges a low resolution HSI (LR-HSI) and a high resolution multispectral image (HR-MSI). The cross-modality distribution of the spatial and spectral information makes the problem challenging. Inspired by the classic wavelet decomposition-based image fusion, we propose a novel lightweight deep neural network-based framework, namely progressive zero-centric residual network (PZRes-Net), to address this problem efficiently and effectively. Specifically, PZRes-Net learns a high resolution and zero-centric residual image, which contains high-frequency spatial details of the scene across all spectral bands, from both inputs in a progressive fashion along the spectral dimension. And the resulting residual image is then superimposed onto the up-sampled LR-HSI in a mean-value invariant manner, leading to a coarse HR-HSI, which is further refined by exploring the coherence across all spectral bands simultaneously. To learn the residual image efficiently and effectively, we employ spectral-spatial separable convolution with dense connections. In addition, we propose zero-mean normalization implemented on the feature maps of each layer to realize the zero-mean characteristic of the residual image. Extensive experiments over both real and synthetic benchmark datasets demonstrate that our PZRes-Net outperforms state-of-the-art methods to a significant extent in terms of both 4 quantitative metrics and visual quality, e.g., our PZRes-Net improves the PSNR more than 3dB, while saving 2.3\times parameters and consuming 15\times less FLOPs. The code is publicly available at https://github.com/zbzhzhy/PZRes-Net

Original languageEnglish
Article number9298460
Pages (from-to)1423-1438
Number of pages16
JournalIEEE Transactions on Image Processing
Volume30
DOIs
Publication statusPublished - 1 Jan 2021

Scopus Subject Areas

  • Software
  • Computer Graphics and Computer-Aided Design

User-Defined Keywords

  • cross-modality
  • deep learning
  • Hyperspectral imagery
  • image fusion
  • super-resolution
  • zero-mean normalization

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