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Proceedings Paper

Miscellaneous modulation transfer function effects relating to sample summing
Author(s): Howard V. Kennedy
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Paper Abstract

Most thermal imaging system performance models do not make provisions for direct input of MTF effects resulting from sample summing, either electronically or on the retina of an observer. Such effects must generally be input as an array of MTF values at matching spatial or temporal frequencies. Both the older NVL static performance model and the new FLIR90 model accept matched pairs of values in this form. One notable example of a sample summing effect is that the misregistration of time delay and integrate (TDI) samples resulting from imaging a moving target. Another is the similar misregistration resulting from an inaccurately known scan rate. Another is the apparent misregistration, on the retina of an observer, of target images when the latencies of different fields of an interlaced image frame are different. Yet another is the smearing of a moving target or scene when samples taken from different interlace fields (and thus at different times) are summed. This paper derives analytic expressions for the effects in question. An example of the proper format in which to input data to the FLIR90 or other performance modeling program is given for each effect.

Paper Details

Date Published: 1 September 1991
PDF: 12 pages
Proc. SPIE 1488, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II, (1 September 1991); doi: 10.1117/12.45799
Show Author Affiliations
Howard V. Kennedy, Texas Instruments Inc. (United States)

Published in SPIE Proceedings Vol. 1488:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II
Gerald C. Holst, Editor(s)

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