6 December 2004 Optimum parameters in image intensifier MTF measurements
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Abstract
Despite MTF is widely accepted as the most complete figure of merit describing optical quality of image intensifier tubes(IIs), it is not well-established neither in industrial nor governmental testing laboratories. This work aims to advance in the standardization of MTF testing procedures for modern IIs. A versatile device to measure MTF of IIs, based on different FFT related methods, was successfully developed and tested. Several stimuli (slits, 3 and 15 bar targets, random targets) were integrated in the system. Novel algorithms with adaptive parameter selection were developed for windowing, background thresholding, stimulus tilt correction, focusing, spatio-temporal denoising, normalization and scaling. All the methods used were simulated before measurement implementation. The measurement of the MTF of the system with the different methods provides the same result, validating the methods. Measurements on two reference tubes showed that the MTF is sensitive to image quality differences, even with similar limiting resolution. Gain control, halo and luminance influence need further research. The results reported are useful to advance in finding a definitive standard method for measuring IIs MTF.
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Sergio Ortiz, Deitze Otaduy, Carlos Dorronsoro, "Optimum parameters in image intensifier MTF measurements", Proc. SPIE 5612, Electro-Optical and Infrared Systems: Technology and Applications, (6 December 2004); doi: 10.1117/12.578066; https://doi.org/10.1117/12.578066
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KEYWORDS
Modulation transfer functions

Image intensifiers

Cameras

Contrast transfer function

Algorithm development

Image quality standards

Dielectrophoresis

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