A study of multi-angles knife-edge method applied to digital modulation transfer function measurement
The objective of this study was to propose a newly-developed method to calculate digital modulation transfer function (DMTF) of digital image system which integrates with CCD/CMOS, non-linearity response and modulation transfer function (MTF) of optics, and is supposed to be linear response. According to previous studies, an imager in terms of its optical transfer function is not appropriate for a discrete imaging system when aliasing occurs, since these optical systems transform high spatial frequencies into low frequencies; the measure of how efficient micro-scanning method could remove the aliasing effects from various assigned optics. In this research, multiple angle knife edge as light sources are employed in this measurement to find out the pristine performance of digital image system. After a comprehensive analysis on the results of the above MTF, it was established that a quick and effective DMTF measurement system was developed to evaluate the pristine performance of digital cameras.
This paper is dedicated to my supervisor, Prof. Alan Lettington, University of Reading, UK; who passed away 15 years ago. We will never forget his contribution over the years to optics and infrared optics.
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