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Predicting the Shadow in an Oblique View of a Rectangular Target
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) INTELLIGENCE SURVEILLANCE AND RECONNAISSANCE DIV
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When land or sea targets are sought in an oblique view of a sunlit scene, their shadows may be their most conspicuous features. It is therefore useful to predict how the shadow of a target will appear in the image, given its shape and orientation and the positions of the sun and the camera. This note considers the prediction of the visible shadows of a simple but representative target shape, the rectangular block, including those cast on the ground or water and those formed on the walls of the block. It gives a complete analysis of the method, and includes a simple method for predicting the sun s position.
APPROVED FOR PUBLIC RELEASE