Objective Image-Quality Assessment for High-Resolution Photospheric Images by Median Filter-Gradient Similarity
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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.
KeywordsHigh resolution imaging Image quality Instrumentation and data management
This work is supported by the National Natural Science Foundation of China (11163004, U1231205, 11263004, 11303011, 11103005, 11463003 and 11203077) and Natural Science Foundation of Yunnan Province (2013FA013, 2013FA032, 2013FZ018 and 2013FZ018). Wenda Cao acknowledges the support of the US National Science Foundation (AGS-0847126, AGS-1146896). Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway). We thank the referee for providing valuable suggestions that substantially helped to improve the quality of the article.
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