Miscellaneous modulation transfer function effects relating to sample summing

Howard V. Kennedy

doi:10.1117/12.45799

1 September 1991 Miscellaneous modulation transfer function effects relating to sample summing

Howard V. Kennedy

Proceedings Volume 1488, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II; (1991) https://doi.org/10.1117/12.45799
Event: Orlando '91, 1991, Orlando, FL, United States

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.

Citation Download Citation

Howard V. Kennedy "Miscellaneous modulation transfer function effects relating to sample summing", Proc. SPIE 1488, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing II, (1 September 1991); https://doi.org/10.1117/12.45799

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