The Modulation Transfer Function Of Focal Plane Array Systems

Bradley, D. J.; Baddiley, C. J.; Dennis, Peter

doi:10.1117/12.941434

Cited by 7 publications

(2 citation statements)

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“…The aliased high frequencies combine with the genuine lower spatial frequencies and corrupt the image. The use of microscanning [10] can increase the sampling rate and overcome the problem of aliasing, but this is not used universally in optical systems employing FPA detectors. Aliasing can also be removed using antialiasing filters, which eliminate spatial frequencies above the Nyquist frequency.…”

Section: B Introduction To the Aliasing Effectmentioning

confidence: 99%

Proposed fast performance evaluation of an imaging system with a discrete detector array

2014

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This paper proposes a newly developed fast measurement of a modulation transfer function (MTF) optical system inclusive of on-axis and off-axis measurement. First, we discuss how a description of 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; we then measure how an efficient microscanning method could remove the aliasing effects from assigned telecentric optics and nontelecentric optics. A knife edge function and a slit function as a light source are employed in this measurement. The experiment with the newly designed MTF measurement system synchronizes on-axis and off-axis measurement. In addition, a microscan method with a specially written macro is introduced in this experiment to eliminate aliasing effects. After simulation and experimental analysis, first the slit function as a target delivers decent MTF repeatability for this newly developed MTF measurement system, which synchronizes with on-axis and off-axis measurement simply in 2 s after all equipment is ready and aligned. Second, after the six-step microscanning, aliasing will be eliminated to near zero in most cases. Finally, it is concluded that during the microscan, there is no difference between telecentric and nontelecentric optics.

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Section: B Introduction To the Aliasing Effectmentioning

confidence: 99%

Proposed fast performance evaluation of an imaging system with a discrete detector array

2014

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“…Such methods are exploited to obtain MTF using Fourier transform of system line diffusion function [1,2,3,4] . However, the utilitarian way to obtain an accurate LSF was brought to the notice of many researchers [5][6][7][8][9] ，and it should be noted that system error in the measurement process of LSF will result in 3-4% [10] error in high spatial frequency area of MTF.…”

Section: Introductionmentioning

confidence: 99%

New method to improve measurement accuracy of modulation transfer function

Song¹,

Gao²,

Zhou³

et al. 2010

SPIE Proceedings

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Modulation transfer function (MTF) of optical systems is often derived by taking Fourier transform (FT) of a measured line spread function (LSF). During MTF measurement process, the measurement accuracy of MTF will decrease as a result when LSF computed is not veracity. Based on the model constructed using the variance information of knife-edge and skew of the knife-edge, this paper presents a new method to improve the accuracy of measurement of MTF. The results showed that the new method can improve the accuracy of MTF to 0.01.

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Triangle orientation discrimination: the alternative to minimum resolvable temperature difference and minimum resolvable contrast

Bijl¹,

Valeton²

1998

Opt. Eng

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The Modulation Transfer Function Of Focal Plane Array Systems

Cited by 7 publications

References 1 publication

Proposed fast performance evaluation of an imaging system with a discrete detector array

Proposed fast performance evaluation of an imaging system with a discrete detector array

New method to improve measurement accuracy of modulation transfer function

Triangle orientation discrimination: the alternative to minimum resolvable temperature difference and minimum resolvable contrast

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