IMPROVED BACKGROUND DISCRIMINATION
Abstract
Research is concerned with infrared systems of extreme sensitivity by the development of a new and novel technique for effective discrimination between a target and its background. Unlike conventional systems which depend on some properties of an ever-changing background for effective space filtering, the new infrared system concentrates on the finite properties of a target. A system was constructed which utilizes the point target properties of (a) invariance under magnification and (b) invariance under rotation to reject the variations in system output signal which are introduced solely by the background. A model of this discrimination system was tested in the spectral region of 2 to 3 microns. System focal length is 100 mm with an effective f-number of approximately 1.5. The use of variable magnification and variable rotation resulted in improvements in system S/N of at least one order of magnitude. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1962
- Accession Number
- AD0331366
Entities
People
- Burton D. Figler
- Frits Zernike
- Thomas J. Morgan