Výsledky vyhledávání - "Modulation and Optical Transfer Functions"

Quantitative phase-gradient imaging at high resolution with asymmetric illumination-based differential phase contrast Autor Mehta, Shalin B, Sheppard, Colin J R

“…We describe a full-field phase-gradient imaging method: asymmetric illumination-based differential phase contrast (AIDPC). Imaging properties of AIDPC are…”
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Optimized sinusoidal phase mask to extend the depth of field of an incoherent imaging system Autor Zhao, Hui, Li, Yingcai

“…Wavefront coding is a powerful technique that can be used to extend the depth of field of an incoherent imaging system. By adding a suitable phase mask to the…”
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Common omissions and misconceptions of wave propagation in turbulence: discussion Autor Charnotskii, Mikhail

“…This review paper addresses typical mistakes and omissions that involve theoretical research and modeling of optical propagation through atmospheric…”
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Phase-shift estimation in sinusoidally illuminated images for lateral superresolution Autor Shroff, Sapna A, Fienup, James R, Williams, David R

“…Sinusoidally patterned illumination has been used to obtain lateral superresolution and axial sectioning in images. In both of these techniques multiple images…”
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White-light imaging with fractal zone plates Autor Furlan, Walter D, Saavedra, Genaro, Monsoriu, Juan A

“…We report the achievement of the first images to our knowledge obtained with a fractal zone plates (FraZPs). FraZPs are diffractive lenses characterized by the…”
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Phase retrieval with signal bias Autor Thurman, Samuel T, Fienup, James R

“…The effect of a uniform measurement bias, due to background light, stray light, detector dark current, or detector offset, on phase retrieval wavefront sensing…”
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Characteristics of complementary ring-resonator add/drop filters modeling by using graphical approach Autor Yupapin, P.P., Saeung, P., Li, C.

“…In this paper, the filtering characteristics of the two kinds of complementary ring-resonator add/drop filters are modeled and investigated. A graphical…”
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Generalizing, optimizing, and inventing numerical algorithms for the fractional Fourier, Fresnel, and linear canonical transforms Autor Hennelly, Bryan M, Sheridan, John T

“…By use of matrix-based techniques it is shown how the space-bandwidth product (SBP) of a signal, as indicated by the location of the signal energy in the…”
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Quantitative phase restoration by direct inversion using the optical transfer function Autor Kou, Shan Shan, Waller, Laura, Barbastathis, George, Marquet, Pierre, Depeursinge, Christian, Sheppard, Colin J R

“…Quantitative phase recovery of phase objects is achieved by a direct inversion using the defocused weak object transfer function. The presented method is…”
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Characterizing flash-radiography source spots Autor Ekdahl, Carl

“…Flash radiography of large hydrodynamic experiments driven by high explosives is a venerable diagnostic technique in use at many laboratories. The size of the…”
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Three-dimensional characterization of optical coherence tomography point spread functions with a nanoparticle-embedded phantom Autor Agrawal, Anant, Pfefer, T Joshua, Gilani, Naureen, Drezek, Rebekah

“…We present a novel (to our knowledge) approach for measurement of the three-dimensional point spread function (PSF) of optical coherence tomography (OCT)…”
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Increase in depth of field taking into account deconvolution by optimization of pupil mask Autor Diaz, Frédéric, Goudail, François, Loiseaux, Brigitte, Huignard, Jean-Pierre

“…We consider optimization of hybrid imaging systems including a phase mask for enhancing the depth of field and a digital deconvolution step. We propose an…”
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Improved logarithmic phase mask to extend the depth of field of an incoherent imaging system Autor Zhao, Hui, Li, Qi, Feng, Huajun

“…A logarithmic phase mask was proposed in 2001, and the depth extension effect was proved at the same time. Three years later, in 2004, further research on that…”
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Measurement of the point-spread function of a noisy imaging system Autor Claxton, Christopher D, Staunton, Richard C

“…The averaged point-spread function (PSF) estimation of an image acquisition system is important for many computer vision applications, including edge detection…”
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Design of eye models used in quantitative analysis of interaction between chromatic and higher-order aberrations of eye Autor Zhai, Yi, Wang, Yan, Wang, Zhaoqi, Liu, Yongji, Zhang, Lin, He, Yuanqing, Chang, Shengjiang

“…Special kinds of eye models are constructed by means of optical system design to quantitatively investigate impacts of longitudinal chromatic aberration (LCA),…”
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Characterizing the modulation transfer function (MTF) of proton/carbon radiography using Monte Carlo simulations Autor Seco, Joao, Oumano, Michael, Depauw, Nicolas, Dias, Marta F., Teixeira, Rui P., Spadea, Maria F.

“…Purpose: To characterize the modulation transfer function (MTF) of proton/carbon radiography using Monte Carlo simulations. To assess the spatial resolution of…”
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An algorithm for the characterisation of multi-exponential decay curves Autor Brübach, J., Janicka, J., Dreizler, A.

“…An algorithm for the non-ambiguous reduction of multi-exponentially decaying luminescence signals to scalar lifetimes is described and characterised. Whereas…”
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Packet error rate analysis of OOK, DPIM and PPM modulation schemes for ground-to-satellite optical communications Autor Ma, Jing, Jiang, Yijun, Yu, Siyuan, Tan, Liying, Du, Wenhe

“…Packet error rate of OOK, DPIM and PPM modulation schemes are researched for ground-to-satellite optical communication systems. Analysis process is based on…”
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Optimized circularly symmetric phase mask to extend the depth of focus Autor Zhou, Feng, Ye, Ran, Li, Guangwei, Zhang, Haitao, Wang, Dongsheng

“…We propose a novel design method for a circularly symmetric phase mask to extend the depth of focus. Using the free-form rational function as the solution…”
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Extension of depth of field using amplitude and phase modulation of the pupil function Autor Bagheri, Saeed, Javidi, Bahram

“…We analyze the extension of depth of field using both amplitude and phase modulation of the pupil function. In particular, we discuss the advantages and…”
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