Predicting the Shadow in an Oblique View of a Rectangular Target.
Scientific Publication
- Report Number:
- DSTO-TN-1076
- Authors:
- Whatmough, R.
- Issue Date:
- 2012-03
- AR Number:
- AR-015-264
- Classification:
- Unclassified
- Report Type:
- Technical Note
- Division:
- Intelligence, Surveillance and Reconnaissance Division (ISRD)
- Release Authority:
- Chief, Intelligence, Surveillance and Reconnaissance Division
- Task Sponsor:
- ASC (DIGO)
- Task Number:
- 07/052
- File Number:
- 2009/1080252/1
- Pages:
- 8
- References:
- 2
- Terms:
- Feature extraction; Visual surveillance
- URI:
- http://hdl.handle.net/1947/10191
Abstract
This note describes a method for predicting the sun shadow produced by a rectangular ground or sea target and visible in an arbitrary oblique view.
Executive Summary
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.