Results 71 to 80 of about 8,432 (118)

An approximation technique for photometric stereo

Pattern Recognition Letters, 1984
Photometric stereo is a technique to determine the orientation of an object. It takes at least three images corresponding to three different light sources to determine the orientation and to eliminate the ambiguities which will arise if only two light sources are used.
Chia-Hoang Lee, Azriel Rosenfeld
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Measurement of capillary hematocrit by photometric techniques

Microvascular Research, 1973
Abstract The quantitation of capillary hematocrit was approached by two photometric techniques. The first involved measurement of the average red cell velocity while at the same time counting the number of red cells which pass per unit time (red cell flux).
P C, Johnson, D L, Hudnall, J H, Dial
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Technique for Measuring Photometric Accuracy

Applied Optics, 1971
A convenient photometric linearity test that meets stringent criteria for accuracy and practicality is described. Experience with alternate, commonly advocated methods illustrates the need for an improved approach. The method described herein relies on direct application of physical principles.
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Review of techniques for photometric redshift estimation

SPIE Proceedings, 2012
A photometric redshift provides an estimate for the distance of an astronomical object, such as a galaxy or quasar, which is a powerful statistical tool for studies of evolutionary properties of galaxies, in particular of faint galaxies, since their spectroscopic data are hard or impossible to obtain.
Hongwen Zheng, Yanxia Zhang
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Photometric Technique For Deriving A

Optical Engineering, 1981
The technique described results in a display gamma function where the contrast between each of the steps is equally discriminable. Digital cathode ray tube (CRT) (and film) displays set up using this technique tend to have high image quality as judged by reconnaissance image interpreters.
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Measurement of the photometric distribution of light sources by deflectometric techniques

ETFA 2001. 8th International Conference on Emerging Technologies and Factory Automation. Proceedings (Cat. No.01TH8597), 2002
This paper proposes an instrument allowing the accurate characterization of the energetic distribution of a given source at a distant plane positioned at will. This is achieved by measuring the light pattern leaving the source by applying deflectometric techniques and photometric measurements, and then applying raytracing algorithms in order to ...
María Jesús Arranz, Josep Arasa, Santiago Royo, Jesus Caum   +3 more
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Photometric Analysis Techniques Study

1974
Abstract : The report describes some studies made on the application of pattern recognition techniques to the Space Object Identification (SOI) problem using passive photometric signature data. Both simulated and measured passive photometric data (primarily, the latter) on satellite objects were compared using a variety of techniques in both the time ...
H. S. Ostrowsky, R. G. Utley
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Some photometric techniques for atmosphereless solar system bodies

Advances in Space Research, 1990
We discuss various photometric techniques and their absolute scales in relation to the information that can be derived from the relevant data. We also outline a new scattering model for atmosphereless bodies in the solar system and show how it fits Mariner 10 surface photometry of the planet Mercury.
Irvine, William M., Lumme, Kari, Peltoniemi, J.   +2 more
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