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A Framelet-Based SFIM Method to Pan-Sharpen THEOS Imagery

  • Yindi Zhao
  • Bo WuEmail author
Research Article
  • 13 Downloads

Abstract

This paper proposes an improved framelet-based pan-sharpening algorithm for Thailand Earth Observation System (THEOS) imagery to decrease the effects of different acquisition times between panchromatic (Pan) and multispectral (MS) images, in which the smoothing filter-based intensity modulation (SFIM) is introduced into low-frequency information fusion instead of the conventional “mean” rule. Moreover, a two-layer procedure is presented to reduce the impacts of mixed pixels caused by the large difference of spatial resolutions between the Pan and MS images. The proposed method is tested on two THEOS datasets and compared with the Gram–Schmidt, SFIM and traditional framelet-based methods. The portability across contourlet transform is also examined. Both qualitative and quantitative evaluation results demonstrate that the proposed method is more independent of the illumination of the Pan image and can achieve better spectral fidelity while maintaining spatial sharpness.

Keywords

THEOS Pan-sharpening Framelet SFIM Spectral fidelity 

Notes

Acknowledgments

Funding was provided by the Fundamental Research Funds for the Central Universities (Grant No. 2015XKMS050), and the National Natural Science Foundation of China (Grant Nos. 41571330, 41601453).

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Copyright information

© Indian Society of Remote Sensing 2019

Authors and Affiliations

  1. 1.School of Environment Science and Spatial InformaticsChina University of Mining and TechnologyXuzhouPeople’s Republic of China
  2. 2.School of Geography and EnvironmentJiangxi normal UniversityNanchangPeople’s Republic of China
  3. 3.Key Laboratory of PoYang Lake Wetland and Watershed Research, Ministry of EducationJiangxi Normal UniversityNanchangPeople’s Republic of China

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