Electronic zoom functionality in under-sampled imaging systems

Stephen D. Burks; Joseph P. Reynolds; Jonathan Hixson; Brian Teaney; Richard Vollmerhausen

doi:10.1117/12.723540

30 April 2007 Electronic zoom functionality in under-sampled imaging systems

Stephen D. Burks, Joseph P. Reynolds, Jonathan Hixson, Brian Teaney, Richard Vollmerhausen

Proceedings Volume 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII; 65430M (2007) https://doi.org/10.1117/12.723540
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

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.

Citation Download Citation

Stephen D. Burks, Joseph P. Reynolds, Jonathan Hixson, Brian Teaney, and Richard Vollmerhausen "Electronic zoom functionality in under-sampled imaging systems", Proc. SPIE 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII, 65430M (30 April 2007); https://doi.org/10.1117/12.723540

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Zoom lenses

Modulation transfer functions

NVThermIP

Targeting Task Performance metric

Eye

Performance modeling

Imaging systems

Show All Keywords

Keywords/Phrases

Search In:

Publication Years