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Proceedings Paper

Stereoscopic ground-based determination of the cloud base height: camera position adjusting with account for lens distortion
Author(s): Alexey I. Chulichkov; Stanislav V. Nikitin; Andrey P. Medvedev; Oleg V. Postylyakov
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Paper Abstract

For the reconstruction of the cloud base height a method was developed based on taking pictures of the sky by a pair of digital photo cameras from the ground and subsequent processing of the obtained sequence of stereo frames. Since the directions of the optical axes of the stereo cameras are not exactly known, a procedure of adjusting of obtained frames was developed which use photographs of the night starry sky. In the second step, the method of the morphological analysis of images is used to determine the relative shift of the coordinates of some fragment of cloud. The shift is used to estimate the searched cloud base height. The proposed method can be used for automatic processing of stereo data and getting the cloud base height. The earlier paper described a mathematical model of stereophotography measurement, poses and solves the problem of adjusting of optical axes of the cameras in paraxial (first-order geometric optics) approximation and was applied for the central part of the sky frames. This paper describes the model of experiment which takes into account lens distortion in Seidel approximation (depending on the third order of the distance from optical axis). Based on this model a procedure of simultaneous camera position adjusting and estimation of parameters of lens distortion in Seidel approximation was developed. The first experimental results of its application are shown.

Paper Details

Date Published: 29 November 2016
PDF: 10 pages
Proc. SPIE 10035, 22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 100353B (29 November 2016); doi: 10.1117/12.2248633
Show Author Affiliations
Alexey I. Chulichkov, M.V. Lomonosov Moscow State Univ. (Russian Federation)
A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Stanislav V. Nikitin, M.V. Lomonosov Moscow State Univ. (Russian Federation)
A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Andrey P. Medvedev, A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Oleg V. Postylyakov, A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)


Published in SPIE Proceedings Vol. 10035:
22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics
Gennadii G. Matvienko; Oleg A. Romanovskii, Editor(s)

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