Objective Image-Quality Assessment for High-Resolution Photospheric Images by Median Filter-Gradient Similarity

Hui Deng, Dandan Zhang, Tianyu Wang, Kaifan Ji, Feng Wang, Zhong Liu, Yongyuan Xiang, Zhenyu Jin, Wenda Cao

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29 Scopus citations


All next-generation ground-based and space-based solar telescopes require a good quality-assessment metric to evaluate their imaging performance. In this paper, a new image quality metric, the median filter-gradient similarity (MFGS) is proposed for photospheric images. MFGS is a no-reference/blind objective image-quality metric (IQM) by a measurement result between 0 and 1 and has been performed on short-exposure photospheric images captured by the New Vacuum Solar Telescope (NVST) of the Fuxian Solar Observatory and by the Solar Optical Telescope (SOT) onboard the Hinode satellite, respectively. The results show that (1) the measured value of the MFGS changes monotonically from 1 to 0 with degradation of image quality; (2) there exists a linear correlation between the measured values of the MFGS and the root-mean-square contrast (RMS-contrast) of the granulation; (3) the MFGS is less affected by the image contents than the granular RMS-contrast. Overall, the MFGS is a good alternative for the quality assessment of photospheric images.

Original languageEnglish (US)
Pages (from-to)1479-1489
Number of pages11
JournalSolar Physics
Issue number5
StatePublished - May 15 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • High resolution imaging
  • Image quality
  • Instrumentation and data management


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