Correction of atmospheric turbulence degraded sequences using grid smoothing

Authors:
Rishaad Abdoola;Guillaume Noel;Barend van Wyk;Eric Monacelli
Affiliations:
Department of Electrical Engineering, French South African Institute of Technology, Tshwane University of Technology, Pretoria, South Africa;Department of Electrical Engineering, French South African Institute of Technology, Tshwane University of Technology, Pretoria, South Africa;Department of Electrical Engineering, French South African Institute of Technology, Tshwane University of Technology, Pretoria, South Africa;Department of Electrical Engineering, Laboratoire D'Ingénierie Des Systèmes De Versailles, Université de Versailles Saint-Quentin-en-Yvelines, Versailles, France
Venue:
ICIAR'11 Proceedings of the 8th international conference on Image analysis and recognition - Volume Part II
Year:
2011

Citing 3
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Abstract

Heat scintillation occurs due to the index of refraction of air decreasing with an increase in air temperature, causing objects to appear blurred and waver slowly in a quasi-periodic fashion. This imposes limitations on sensors used to record images over long distances resulting in a loss of detail in the video sequences. A method of filtering turbulent sequences using grid smoothing is presented that can be used to either extract a single geometrically improved frame or filter an entire turbulent sequence. The extracted frame is in general sharper than when utilising simple GFATR (Generalized First Average Then Register). It also better preserves edges and lines as well as being geometrically improved.