Role of image processing in solar coronal research

Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan

Research output: Chapter in Book/Report/Conference proceedingConference Proceeding (Non-Journal item)


The wealth of information regarding the structure and distribution of magnetic fields and plasmas embedded in images of the solar corona taken in the visible wavelength range and/or the extreme ultraviolet (EUV), covers several orders of magnitude in brightness, in the radial and azimuthal directions. As such, they present serious visualization challenges. These can only be revealed with the use of image processing tools. This presentation will focus on results from two recently developed approaches: (1) The Adaptive Circular High-pass Filter, ACHF, and the Normalized Radial Gradient Filter, NRGF, which are ideal for limb observations of the corona made in the visible wavelength range during total solar eclipses or with coronagraphs. (2) The Noise Adaptive Fuzzy Equalization (NAFE) and the multi-scale Gaussian normalization process (MGN), suitable for the visualization of fine structures in EUV images. These methods yield artifact-free images and uncover details that are hidden in the original unprocessed images. Such details have led to the discovery of new features that are essential for exploring the dynamics and thermodynamics of structures in the solar corona.

Original languageEnglish
Title of host publicationCombinatorial Image Analysis - 16th International Workshop, IWCIA 2014, Proceedings
PublisherSpringer Nature
Number of pages8
ISBN (Print)9783319071473
Publication statusPublished - 2014
Event16th International Workshop on Combinatorial Image Analysis, IWCIA 2014 - Brno, Czech Republic
Duration: 28 May 201430 May 2014

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume8466 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference16th International Workshop on Combinatorial Image Analysis, IWCIA 2014
Country/TerritoryCzech Republic
Period28 May 201430 May 2014


  • Image processing
  • Sun: corona
  • Ultraviolet emission
  • Visible emission


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