Results 251 to 260 of about 19,001,244 (290)

TIR collimator designs based on point source and extended source methods

SPIE Proceedings, 2015
TIR collimator are essential illumination components demanding high efficiency, accuracy, and uniformity. Various illumination design methods have been developed for different design domains, including tailoring method, design via optimization, mapping and feedback method, and the simultaneous multiple surface (SMS) method.
T. Talpur, A. Herkommer
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A method of calculating the field of a point source in a waveguide

Journal of Soviet Mathematics, 1982
Translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 99, 146-156 (Russian) (1980; Zbl 0478.35033).
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A subspace decomposition method for point source localization in blurred images

Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, 2002
We address the problem of resolving blurred point sources in intensity images. A new approach to image restoration is introduced which is a 2-D generalization of techniques originating from the field of direction of arrival estimation (DOA). In the 2-D frequency domain, algorithms, such as MUSIC, may be adapted to search for these point sources.
Metin Gunsay, Brian D. Jeffs
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A novel photometric stereo method with nonisotropic point light sources

2016 23rd International Conference on Pattern Recognition (ICPR), 2016
This paper presents a photometric stereo method with nonisotropic point light sources. Subject to the non-uniform lighting conditions produced by the nonisotropic point sources, each incident light ray should be precisely determined so as to realize an accurate calculation of surface normal. In the proposed method, radiance model of the light source is
Ying Nie 0006, Zhan Song
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A Point-Source Method for Sampling Soil Atmospheres

Transactions of the ASAE, 1980
ABSTRACT A point-source soil atmospheric sampler was designed and field tested. Equilibration periods of 1 h after placement were enough to achieve representative in situ samples from an agricultural silt loam soil. Vectorial variability of C02 in the horizontal direction was occa-sionally significant, whereas variability of C02 was con-sistently ...
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On the choice of source points in the method of fundamental solutions

Engineering Analysis with Boundary Elements, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Partition of unity methods for approximation of point water sources in porous media

Applied Mathematics and Computation, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Pavel Exner 0002, Jan Brezina
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Mathematical modeling of physical fields by the point-source method

Bulletin of the Russian Academy of Sciences: Physics, 2008
The point-source method is used to model physical fields. The error of this method is estimated. The results of testing the method are reported, which confirm its efficiency.
Yu. A. Bakhvalov, S. Yu. Knyazev, A. A. Shcherbakov   +2 more
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A computer method for calculation of the point source response of a focusing collimator

Physics in Medicine & Biology, 1970
A digital computer is used with a ray tracing technique to calculate the response of a multihole focusing collimator to a point source of radiation placed anywhere in the object space. The analysis is applicable to a focusing collimator with circular holes and includes both the geometrical contribution to the response and the effects arising from both ...
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SLODAR method. Part 2: The use of point sources

Atmospheric and Oceanic Optics, 2010
The SLOpes Detection And Ranging (SLODAR) method is supplemented with the theory of the measurement of the positions of aberration layers for the case of the use of point reference sources having converging/diverging wavefronts. We determine the dependence of the shift in the correlation peak on the distance to the measured aberration layer, the ...
S. O. Galetskiy, T. Yu. Cherezova
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