2017/01/19 by Hui Deng, Deng, Hui, Dandan Zhang +15 · 1 citation
Decision Sciences · Engineering · #Advanced Image Fusion Techniques #FOS: Physical sciences #Grey System Theory Applications #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Satellite Image Processing and Photogrammetry #Solar and Stellar Astrophysics (astro-ph.SR)
paper · pdf · doi:10.48550/arxiv.1701.05300
openalex publication_date 2017/01/19 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
All next generation ground-based and space-based solar telescopes require a good quality assessment metric in order 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 MFGS changes monotonically from 1 to 0 with degradation of image quality; (2)there exists a linear correlation between the measured values of MFGS and root-mean-square-contrast (RMS-contrast) of granulation; (3)MFGS is less affected by the image contents than the granular RMS-contrast. Overall, MFGS is a good alternative for the quality assessment of photospheric images.