17 December 1980 Background Suppression With Variable Modulation Transfer Function (MTF) Imaging Systems
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Abstract
A technique is described for suppressing the lower spatial frequencies in the object using an optical system with a time-varying MTF. The technique is applicable to imaging radiometers operating in the infrared region. The required variations in the MTF are produced by causing the image to move in a programmed sequence of small amplitude circular gyrations on the face of the detector. The gyrations are performed at a frequency high compared to the system frame rate. A series of calculations are described which indicate that, at low spatial frequencies, average suppression ratios of at least 500 to 1 can be achieved with this technique.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Theodore Zehnpfennig, Saul Rappaport, and Richard Wattson "Background Suppression With Variable Modulation Transfer Function (MTF) Imaging Systems", Proc. SPIE 0253, Modern Utilization of Infrared Technology VI, (17 December 1980); doi: 10.1117/12.959494; https://doi.org/10.1117/12.959494
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