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23 September 2015 A study of modulation transfer function of digital image system via microscanning technique
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This paper proposes a newly developed fast measure of MTF optical system inclusive of on axis and off-axis. Firstly, we discusses how a description of an imager in terms of its optical transfer function is not appropriate for discrete imaging system when aliasing occurs, since these optical systems transform high spatial frequencies into low frequencies; then measure how efficient microscanning method could remove the aliasing effects from assigned telecentric optics and non-telecentric optics. Knife edge and slit function as a light source is employed in this measurement. Experiment with newly-designed MTF measurement system synchronizes on axis and off-axis measurement. In addition, micro-scan method with specially written macro is introduced in this experiment to eliminate aliasing effects. After simulation and experimental analysis, first, slit function as a target deliver decent MTF repeatability for this newly developed MTF measurement system which synchronize with on axis and off-axis measurement simply in two seconds after all equipment is ready and aligned. Secondly, after six step microscanning, aliasing will be eliminate to near zero in most cases. Finally, it is concluded that during microscan, there is no difference between telecentric and non-telecentric optics.
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Yi-Chin Fang, Ho-Lin Tsay, Guo-Yi Huang, Szu-Yuan Tseng, and Po-Ming Lin "A study of modulation transfer function of digital image system via microscanning technique", Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 96261C (23 September 2015);

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