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| Paper: |
Visualization of Coronal Structures and Solar Physics |
| Volume: |
461, Astronomical Data Analysis Software and Systems XXI |
| Page: |
471 |
| Authors: |
Bělik, M.; Druckmüllerová, H. |
| Abstract: |
Numerical method of an image processing suitable for a visualization of corona
images taken during total solar eclipses is presented in this paper. A
modified phase correlation, based on Fourier transform, enables the measurement
of translation, rotation, and scaling factors between two images. With the
application of this technique, pairs of images with different exposure times,
different brightness scales, such as linear for CCD and nonlinear for images
taken with photographic film, can be aligned with sub-pixel precision. This
method is inspired by human vision and resulting images are very near to the
human vision sensation during the eclipse.
Total solar eclipse photography gives us now the opportunity to obtain
valuable scientific data even with relatively simple equipment. The method gives
reliable results even for images taken with different equipment. Very faint
details visible in result images allow us to study the dynamics of coronal plasma,
for example. Some examples of such results, obtained during several past total
solar eclipses, are also presented. This paper illustrates that an improvement
in both mathematical theory and numerical methods may often lead to more
effective results than the improvement in technical means. |
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