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31 August 1993 Velocity mapping of infrared cloudy skies
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A shipborne infrared surveillance system, which is tasked with detecting real time target trajectories, needs a kinematic evaluation of the cloudy background. In effect, false alarms appear at the cloud edges; these false alarms reducing the effectiveness of the surveillance system. The elimination of clutter by means of static criteria on each frame is not possible because of the spatial coherence of these edges. The interest of this study is to bring together complementary information that concerns the temporal evolution of the 2D infrared signal. Thus the aim is to evaluate the kinematics of cloudy backgrounds. The originality of this paper resides in the use of the Generalized Hough Transform associated with an affine transform method using optical flow computation. The first transform gives an average displacement for a set of pels, while the second extracts more accurately the motion information by means of differential analysis based on the optical flow constraint equation. The complementary aspect of these two methods of motion estimation is shown.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christophe Collet and Andre Quinquis "Velocity mapping of infrared cloudy skies", Proc. SPIE 1969, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IV, (31 August 1993);

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