Image Processing of Coronal Pictures

Abstract

Coronal images contain many complex, superposed, faint, optically- thin structures: Rays, loops, curved streamers, etc. The spatial resolution is often limited by the signal/noise ratio in the recording medium while the dynamic range in intensity is severely dominated by the radial gradient. The results obtained with a new simple image processing algorithm are applied to several typical eclipse and coronographic pictures. This 2D filter (second order difference operator in k-direction) shows superior quality by improving the signal/noise ratio, reducing the dynamic range and enhancing faint coronal structures. A comparison with results obtained with more commonly used 2D filters is also presented. The algorithm used here are briefly described, together with discussions of enhanced coronal images of coronal physics interest. Keywords: Image processing; Solar corona.

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Document Details

Document Type
Technical Report
Publication Date
Feb 28, 1989
Accession Number
ADA205326

Entities

People

  • Christian Nitschelm
  • Julius Sykora
  • Olga Koutchmy
  • Raymond N. Smartt
  • Serge Koutchmy

Organizations

  • Air Force Research Laboratory

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Astronomy
  • Christianity
  • Contracts
  • Coronal Mass Ejections
  • Czechoslovakia
  • Detectors
  • Dynamic Range
  • Filters
  • Image Processing
  • Intensity
  • Lepidoptera
  • Observatories
  • Physics
  • Solar Corona
  • Solar Eclipses
  • White Light

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Image Processing and Computer Vision.
  • Space Exploration and Orbital Mechanics.