Measuring the modulation transfer function of image capture devices: what do the numbers really mean?

Zhang, Xujie; Kashti, Tamar; Kella, D.; Frank, Tal; Shaked, Doron; Ulichney, Robert; Fischer, Mani; Allebach, Jan P.

doi:10.1117/12.912989

Cited by 39 publications

(26 citation statements)

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“…This is analogous to obtaining the point spread function (PSF) for an optical system. 44,45 However, this would be experimentally hard to achieve, because of the high pressures and fast actuation required. Furthermore, the result would only be an approximation of δ.…”

Section: Frequency Response Of the Fluidic/ Electrochemical Systemmentioning

confidence: 99%

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Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Trouillon

Gijs

2014

Lab Chip

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ARTICLEThis journal is © The Royal Society of Chemistry 2013 J. Name., 2013, 00, 1-3 | 1 The time response of an electrode incorporated into a fluidic channel to variations in analyte concentration of the outer-sphere redox probe ferrocenemethanol was investigated, both for amperometry (AMP) and cyclic voltammetry (CV). The experimental data show that the temporal resolution of CV is not as good as for AMP, as CV cannot properly detect fast concentration transients. The delayed response of CV was previously reported, for neurotransmitters, and mostly attributed to adsorption of the analyte to the electrode surface. By using an outer-sphere redox couple, we show that mass transport also significantly delays the response of CV. The experimental delay time in CV was understood from mass transfer limitations due to the relaxation of the diffusion layer during repeated potential scanning. Furthermore, a robust protocol for the analysis of fast concentration transients was established, using the impulse and modulation transfer functions of the system. This method was found to be more precise than the mere analysis of the undifferentiated traces in the time domain. As a proof of concept, the effect of increased viscosity was investigated, showing that AMP was more sensitive than CV to these variations. Overall, this analysis underlines further the enhanced temporal sensitivity of AMP over CV, at the expense of decreased chemical resolution, potentially having implications for in situ electrochemical detection of biologically relevant molecules.

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Section: Frequency Response Of the Fluidic/ Electrochemical Systemmentioning

confidence: 99%

“…The MTF is then the ratio of the output contrast contrast output to the input contrast contrast input , 44 as a function of f…”

Section: Frequency Response Of the Fluidic/ Electrochemical Systemmentioning

confidence: 99%

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Trouillon

Gijs

2014

Lab Chip

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“…It has a very simple design, which makes it possible to determine the quality of the imaging system automatically, and therefore objectively, which makes it very popular with laboratory testing. However, one of the main disadvantaged of using this test is that it is impossible to determine resolution without the support of computer tools and advanced mathematical algorithms in the frequency domain (Zhang et al, 2012). Additionally, this type of target and the algorithms used for the analysis, are not well suited for highly aliased imagery, which is often the same with light-weight, lowcost video sensors used on UAV platforms (www.imatest.com.…”

Section: Choice Of Calibration Target For Evaluating Uav Sensorsmentioning

confidence: 99%

Review of Methods for Determining the Spatial Resolution of Uav Sensors

Orych

2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The ground resolved distance (GRD) of an imaging sensor, i.e. the size of the smallest element distinguishable on acquired imagery, is one of the most important sensor quality assessment factors, as it is directly linked to the amount of information that can be derived from the end product. The paper is a review of a wide variety of calibration targets used for determining the spatial resolution of remote sensing sensors. The author provides a description of calibration targets used historically and then moves on to high-frequency targets used for high-resolution remote sensing imaging equipment. As analysis is made which of these types of targets are best suited for UAV sensors, taking into account parameters very specific to UAVs: frame size, small GSD values and low flight stability.

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“…The modulation transfer function (MTF) measurement is commonly computed to characterize the spatial resolution of an optical system. To compute an imaging system's MTF, the ratio of the acquired image modulation and the original object modulation is accounted as demonstrated in Equation (3) [30]:…”

Section: Spatial Characterizationmentioning

confidence: 99%

High Throughput AOTF Hyperspectral Imager for Randomly Polarized Light

Abdlaty

Orepoulos²,

Sinclair³

et al. 2018

Photonics

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Abstract:The acousto-optic tunable filter (AOTF) is one of the most used techniques for hyperspectral imaging (HSI), and is capable of fast and random wavelength access, high diffraction efficiency, and good spectral resolution. Typical AOTF-HSI works with linearly polarized light; hence, its throughput is limited for randomly polarized applications such as fluorescence imaging. We report an AOTF-based imager design using both polarized components of the input light. The imager is designed to operate in the 450 to 800 nm region with resolutions in the range of 1.5-4 nm. The performance characterization results show that this design leads to 68% improvement in throughput for randomly polarized light. We also compared its performance against a liquid crystal tunable filter (LCTF)-based imager.

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Measuring the modulation transfer function of image capture devices: what do the numbers really mean?

Cited by 39 publications

References 0 publications

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Review of Methods for Determining the Spatial Resolution of Uav Sensors

High Throughput AOTF Hyperspectral Imager for Randomly Polarized Light

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