Spatial analysis of ground-based IR cloudy sky images

Shimshon N. Lashansky; Nissim Ben-Yosef; Amotz Weitz

doi:10.1117/12.137857

21 September 1992 Spatial analysis of ground-based IR cloudy sky images

Shimshon N. Lashansky, Nissim Ben-Yosef, Amotz Weitz

Proceedings Volume 1687, Characterization, Propagation, and Simulation of Sources and Backgrounds II; (1992) https://doi.org/10.1117/12.137857
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

In the development and analysis of sophisticated JR detection and recognition systems it is necessary to have a priori knowledge of the background clutter . In this paper, the spatial structure of ground-based infrared cloudy sky images is analyzed in terms of the spatial power spectrum and the spatial autocorrelation function . The experimental results we obtained for ground-based JR cloudy sky images do not fit the analytical model of the Wiener Spectrum 1,2 that is frequently used to describe natural clutter sources in the infrared .The spatial structure of ground-based cloudy sky IR images was found to be dependent on the percentage cloud cover in the image . Acorrected model was developed that relates the spatial structure of cloudy sky images to the percentage cloud cover in the image.

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Shimshon N. Lashansky, Nissim Ben-Yosef, and Amotz Weitz "Spatial analysis of ground-based IR cloudy sky images", Proc. SPIE 1687, Characterization, Propagation, and Simulation of Sources and Backgrounds II, (21 September 1992); https://doi.org/10.1117/12.137857

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KEYWORDS

Clouds

Infrared imaging

Fourier transforms

Infrared radiation

Image processing

Radiometry

Spatial frequencies

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