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Proceedings Paper

Imaging vertically through the atmosphere: restoration of satellite images based on atmospheric MTF evaluation
Author(s): Dan Arbel; O. Moldovan; R. Jacobson; Norman S. Kopeika; Arnon Karnieli
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Paper Abstract

When carrying out satellite images by imaging vertically through the atmosphere, distortions and blur arise as a result of turbulence and aerosols. Contrast is reduced by path radiance. The recently developed atmospheric Wiener filter, which corrects for turbulence blur, aerosol blur, and path radiance simultaneously, is implemented in digital restoration of Landsat imagery over seven wavelength bands of the satellite instrumentation. A required input is weather. Restoration is most impressive for high optical depth situations, which cause larger blue. Restoration improves both smallness of size of resolvable detail and contrast. Turbulence modulation transfer function (MTF) is calculated from meteorological data. Aerosol MTF is consistent with optical depth. The product of the two yields atmospheric MTF, which is implemented in the atmospheric Wiener filter. Turbulence blue, aerosol blur, and path radiance contrast loss are all corrected simultaneously, as if there were in intervening atmosphere. The primary source of atmospheric blur is seen to be aerosol forward scatter of light. Restorations are shown for various wavelength bands and are quite apparent even under clear weather conditions.

Paper Details

Date Published: 3 November 1998
PDF: 12 pages
Proc. SPIE 3433, Propagation and Imaging through the Atmosphere II, (3 November 1998); doi: 10.1117/12.330228
Show Author Affiliations
Dan Arbel, Ben-Gurion Univ. of the Negev (Israel)
O. Moldovan, Ben-Gurion Univ. of the Negev (Israel)
R. Jacobson, Ben-Gurion Univ. of the Negev (Israel)
Norman S. Kopeika, Ben-Gurion Univ. of the Negev (Israel)
Arnon Karnieli, Ben-Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 3433:
Propagation and Imaging through the Atmosphere II
Luc R. Bissonnette, Editor(s)

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