Accession Number:

ADA561781

Title:

Predicting the Shadow in an Oblique View of a Rectangular Target

Descriptive Note:

Technical note

Corporate Author:

DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) INTELLIGENCE SURVEILLANCE AND RECONNAISSANCE DIV

Personal Author(s):

• Whatmough, Robert

Report Date:

2012-03-01

Pagination or Media Count:

17.0

Abstract:

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.

Descriptors:

• *FEATURE EXTRACTION
• AUSTRALIA
• IMAGES
• LAND AREAS
• SHADOWS
• SHAPE
• SUN
• TARGETS
• VISIBILITY
• VISUAL SURVEILLANCE
• WATER

Subject Categories:

• Cybernetics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE