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Proceedings Paper

Electronic zoom functionality in under-sampled imaging systems
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Paper Abstract

US Army thermal target acquisition models based on the Johnson metric do not accurately predict sensor performance with electronic zoom (E-zoom). For this reason, NVTherm2002 removed the limiting E zoom Modulation Transfer Functions (MTF) to agree better with measured performance results. In certain scenarios, especially with under-sampled staring sensors, the model shows incorrect performance improvements with E-zoomed images. The current Army model NVThermIP, based upon the new targeting task performance (TTP) metric, more accurately models range performance in these cases. E-zoom provides system design flexibility when limited to a single optical field-of-view and/or eye distance is constrained by ergonomic factors. This paper demonstrates that targeting acquisition range performance, modeled using the TTP metric, shows increases only up to an optimized magnification and then decreases beyond this optimal value. A design "rule of thumb" is provided to determine this optimal magnification. NVThermIP modeled range performance is supported with E-zoom perception experiment results.

Paper Details

Date Published: 30 April 2007
PDF: 10 pages
Proc. SPIE 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII, 65430M (30 April 2007); doi: 10.1117/12.723540
Show Author Affiliations
Stephen D. Burks, U.S. Army Night Vision and Electronic Sensors Directorate (United States)
Joseph P. Reynolds, U.S. Army Night Vision and Electronic Sensors Directorate (United States)
Jonathan Hixson, U.S. Army Night Vision and Electronic Sensors Directorate (United States)
Brian Teaney, U.S. Army Night Vision and Electronic Sensors Directorate (United States)
Richard Vollmerhausen, Consultant (United States)


Published in SPIE Proceedings Vol. 6543:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII
Gerald C. Holst, Editor(s)

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