Proposed performance measures for imaging systems with discrete detector arrays

Lettington, Alan H.; Dunn, D.; Fairhurst, Alison M.; Fang, Y.

doi:10.1080/09500340121035

Cited by 5 publications

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“…Both of these measures assume a linear system and are measured with respect to the spatial frequencies in the scene. If the scene is represented as an array of intensities f m, then an image of this scene gi produced by an imaging system is given by [2][3][4] gi X m f mhi − m;…”

Section: Modulation Transfer Function For An Optical System With a DImentioning

confidence: 99%

“…This measurement assume a linear system and is measured with respect to spatial frequencies in the scene [2]. However, digitalized image systems commonly seen on the market, such as CCD and complementary metaloxide semiconductor cameras, reflected a lack of anisoplanatism observed with the detector arrays when measured using the more usual definition of the modulation transfer function (MTF).…”

Section: Introductionmentioning

confidence: 99%

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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: Modulation Transfer Function For An Optical System With a DImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%