Imaging Systems

Imaging system performance based upon Fλ∕d

[+] Author Affiliations
Gerald C. Holst

JCD Publishing Company, 2932 Cove Trail, Winter Park, Florida 31789

Opt. Eng. 46(10), 103204 (October 03, 2007). doi:10.1117/1.2790066
History: Received December 26, 2006; Revised May 01, 2007; Accepted May 11, 2007; Published October 03, 2007
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Imaging system performance can be described in the spatial domain, where the optical blur diameter is compared to the detector size, or in the frequency domain [modular transfer function (MTF) approach], where the optics cutoff is compared to the detector cutoff. Both comparisons provide a metric that is a function of Fλd, where F is the focal ratio, λ is the wavelength, and d is the detector size. Fλd is applied to three models: Schade’s equivalent resolution (visible systems), Snyder’s MTFA (MTF area; visible systems), and target acquisition (NVThermIP—an infrared system model). All models produced curves that exhibit a transition in the region 0.41<Fλd<1.0, representing a change from detector-limited to optics-limited performance. NVThermIP’s contrast equations are simplified to easily calculate resolution and acquisition range. Trade-off analyses include range versus detector size, versus focal ratio, and versus field of view (FOV). When Fλd>2, no aliasing occurs. This may be important for medical imaging, where sampling artifacts may be interpreted as a medical abnormality, or for space probes, where it is impossible to obtain ground truth.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Gerald C. Holst
"Imaging system performance based upon Fλ∕d", Opt. Eng. 46(10), 103204 (October 03, 2007). ; http://dx.doi.org/10.1117/1.2790066


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