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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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Learning to Minify Photometric Stereo
Computer Vision and Pattern Recognition, 2019Photometric stereo estimates the surface normal given a set of images acquired under different illumination conditions. To deal with diverse factors involved in the image formation process, recent photometric stereo methods demand a large number of ...
Junxuan Li +3 more
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Photometric Displacement Transducer
IEEE Transactions on Biomedical Engineering, 1969Measurements of variations in intensity of light reflected from a moving surface provide a method for quantitating displacement. A system to monitor displacements of a few microns is easily constructed. This technique has wide application in biological experiments, offering the advantage of probeless displacement monitoring.
Gerald W. Timm, William E. Bradley
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[1990] Proceedings Third International Conference on Computer Vision, 1991
The author compares the photometric effects of motion (which is defined as the variation of a point's imaged intensity as a consequence of motion) and the geometric effects of motion (which is defined as the variation in projected surface geometry as a consequence of motion).
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The author compares the photometric effects of motion (which is defined as the variation of a point's imaged intensity as a consequence of motion) and the geometric effects of motion (which is defined as the variation in projected surface geometry as a consequence of motion).
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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 many flavours of photometric redshifts
Nature Astronomy, 2018Since more than 70 years ago, the colours of galaxies derived from flux measurements at different wavelengths have been used to estimate their cosmological distances.
M. Salvato, O. Ilbert, B. Hoyle
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Semi-Calibrated Photometric Stereo
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2020While conventional calibrated photometric stereo methods assume that light intensities and sensor exposures are known or unknown but identical across observed images, this assumption easily breaks down in practical settings due to individual light bulb's
Donghyeon Cho +3 more
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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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Classification of Photometric Factors Based on Photometric Linearization
2006We propose a new method for classification of photometric factors, such as diffuse reflection, specular reflection, attached shadow, and cast shadow. For analyzing real images, we utilize the photometric linearization method which was originally proposed for image synthesis. First, we show that each pixel can be photometrically classified by the simple
Yasunori Ishii +2 more
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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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