Analysis of Sampled Imaging Systems

Vollmerhausen, Richard H.; Driggers, Ronald G.

doi:10.1117/3.353257

Cited by 42 publications

(35 citation statements)

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“…Thus, a point object is never imaged on a point in the image plane, as shown in Figure 3. The diffraction PSF for an incoherent imaging system with circular-aperture lens of diameter D is given as follows [17][18][19]:…”

Section: Lens Diffraction Psf and Mtfmentioning

confidence: 99%

“…Mathematical models [17] as well as many commercial software like V-CODE [23] is available for the calculation of aberration effect at different locations in the image plane. In this paper, we use the following Gaussian function for the aberration modeling of the lens used in W-band PMMW imaging system: where r geom is the geometric blur scaling factor and r is same as in Eq.…”

Section: Lens Geometric Aberration Psf and Mtfmentioning

confidence: 99%

“…From measured data, it is clear that Rayleigh criterion hold for object angular separation 0.57 • (≈ 2.36 mm) in object space at distance 2380 mm. Theoretically, the minimum resolvable separation in the image plane is given as follows [17,18]:…”

Section: Point Sourcementioning

confidence: 99%

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Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Singh

Kim²,

Tiwary³

et al. 2010

PIER B

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Abstract-The appropriateness of dielectric loaded antenna for the passive millimeter wave imaging application has recently been demonstrated. In this paper, we analyze the optical performance of the passive millimeter wave (PMMW) imaging system based on a 1D focal plane array (FPA) of dielectric rod waveguide (DRW) antennas. A first step in the design process is to analyze the image quality potential of 1D FPA-based imaging system in terms of the point spread function (PSF) and the modulation transfer function (MTF). We consider the effect of lens, DRW antenna, electromagnetic crosstalk between adjacent DRW antenna elements in the array, and sampling. From simulation and measurement, we found that the image quality in the passive millimeter wave imaging system with a DRW antenna array is less sensitive to electromagnetic crosstalk between antenna elements in the array. The measurements and simulations show that the system is diffraction limited and also closely agrees with the Rayleigh criterion of resolution for diffraction limited optical systems.

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Section: Lens Diffraction Psf and Mtfmentioning

confidence: 99%

Section: Lens Geometric Aberration Psf and Mtfmentioning

confidence: 99%

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Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Singh

Kim²,

Tiwary³

et al. 2010

PIER B

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show abstract

“…15 Let H pre ͑͒ be the imager prefilter MTF and H post ͑͒ be the imager postfilter MTF. Prefilter MTF includes optics, detector, and perhaps line-of-sight jitter.…”

Section: Predicting Sampled-imager Minimum Resolvable Temperaturementioning

confidence: 99%

Predicting the effect of gain, level, and sampling on minimum resolvable temperature measurements

Vollmerhausen¹

2009

Opt. Eng

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Abstract. We describe a model to predict the minimum resolvable temperature ͑MRT͒ performance of thermal imagers. Although MRT is a common measurement, it is difficult to achieve consistent results. The operator is permitted but not mandated to change gain, level, and sample phasing for each bar pattern viewed. Changing the sensor control settings affects the resulting MRT. However, the state of the imager is not recorded along with the temperature data. The model predicts the effect of gain, level, and sample phase on MRT results. Model predictions are compared to measurements to demonstrate theory validity. The comparisons also demonstrate the variability that results from ignoring the sensor state when reporting MRT. © 2009 Society of Photo-Optical Instrumentation Engineers.

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“…By comparing the samples of the aliased and not aliased signal, the aliasing evaluation has been performed by means of a set of three score indexes that have been chosen among those defined in literature [10,17,18,24,25,26] as the most effective for our evaluation purpose. The first index is the peak error (PE), that is the maximum absolute value of the difference between the pixels of the aliased and not aliased spectrum.…”

Section: The Aliasing Score Indexesmentioning

confidence: 99%

Aliasing assessment in wavelength domain of hyperspectral data

Santurri

2006

J Real-Time Image Proc

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This paper focuses on a procedure for the assessment of spectral aliasing in hyper-spectral data acquired by push-broom spectrometers. The procedure is based on a push-broom spectrometer model that simulates acquired spectra by taking into account only the instrument parameters; aliasing is measured by means of some figures of merit considered among those proposed in literature. Quantitative evaluations have been performed on simulated spectra both with and without ideal atmospheric and radiometric correction. Results are presented in this paper; the impact of spectrometer slit size on aliasing appearance is also addressed.

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Analysis of Sampled Imaging Systems

Cited by 42 publications

References 0 publications

Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Predicting the effect of gain, level, and sampling on minimum resolvable temperature measurements

Aliasing assessment in wavelength domain of hyperspectral data

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