Results 291 to 300 of about 240,809 (322)
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IEEE Transactions on Pattern Analysis and Machine Intelligence, 2008
Conventional photometric stereo recovers one normal direction per pixel of the input image. This fundamentally limits the scale of recovered geometry to the resolution of the input image, and cannot model surfaces with subpixel geometric structures. In this paper, we propose a method to recover subpixel surface geometry by studying the relationship ...
Tan, Ping, Lin, Stephen, Quan, Long
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Conventional photometric stereo recovers one normal direction per pixel of the input image. This fundamentally limits the scale of recovered geometry to the resolution of the input image, and cannot model surfaces with subpixel geometric structures. In this paper, we propose a method to recover subpixel surface geometry by studying the relationship ...
Tan, Ping, Lin, Stephen, Quan, Long
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Photometric and Colorimetric Tests
2014The chapter describes the tests that can be performed on lamps and luminaires. The first two sections of the chapter report photometric tests and measurements, starting from the measurement of luminous flux. There are two principal methods for measuring total luminous flux or radiant flux. One incorporates an integrating sphere (Sect. 1), and the other
Mercatelli L, Giannini A, Sani E
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The Photometric Sensibility of the Eye and the Precision of Photometric Observations
Journal of the Optical Society of America, 1931In this paper data are presented to show that for maximum photometric sensibility the brightness of the photometric field should be adjusted so that a brightness level of from 20 to 30 millilamberts is secured. At this brightness the difference fraction ΔB/B has a value of 1.37 percent.
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Physics Today, 1950
Photometric devices, especially those intended for the measurement of color, must be highly sensitive to small differences if they are to give useful information.
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Photometric devices, especially those intended for the measurement of color, must be highly sensitive to small differences if they are to give useful information.
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GAIA Photometric System: Simulation of Photometric Observations
Astrophysics and Space Science, 2002We present a software package developed for modelling of the GAIA photometric observations. The modelling procedure is very flexible and fully controlled via the parameter file. Therefore, configuration of the GAIA telescopes and photometric systems, as well as the object samples under investigation, can be adjusted easily.
Viktoras Deveikis +2 more
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PHOTOMETRIC AND IMAGING PERFORMANCE
EAS Publications Series, 2002Three topics within GAIA photometry have been selected for discussion here. (1) The sampling scheme of the CCDs has been tuned to serve the various purposes: detection of stars, astrometry, broad- and medium-band photometry, and imaging of a small area around each detected star, but the tuning may not yet be optimal.
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Optometry and Vision Science, 1975
This paper describes how information about the configuration of the cornea can be derived from the raw data obtained with telecentric photokeratometers, and how such data can be expressed and used. It also deals with the interrelations of the different ways of expressing the data.
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This paper describes how information about the configuration of the cornea can be derived from the raw data obtained with telecentric photokeratometers, and how such data can be expressed and used. It also deals with the interrelations of the different ways of expressing the data.
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Photometric determination of nitrite
Talanta, 1981A new sensitive colour reaction for nitrite determination is presented. The method is based on the reaction of nitrite with p-aminobenzoic acid to form a diazonium ion, which is coupled with 8-hydroxyquinoline, in alkaline medium, to form a reddish-orange water-soluble azo dye.
W A, Bashir, S, Flamerz
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Photometric Quantitation of Haemagglutination
Scandinavian Journal of Haematology, 1967A modified technique for photometric quantitation of haemagglutination was employed in experiments with anti‐A test sera and Arcell suspensions. The agglutinates and the free cells were separated by simple sedimentation. As an absolute separation was impossible in this way, no exact estimation of percentage agglutination could be made.
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Photometric titrations—IIDesign and construction of a photometric titrator
Talanta, 1961Abstract The construction of a simple photometric titrator is described. The light receptor is a photo-diode whose design makes it easily possible to exclude external light. Consequently, titrations can be performed with the titration vessel in the open.
H. Flaschka, P. Sawyer
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