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Photometric Normalization Techniques for Illumination Invariance
2010Face recognition technology has come a long way since its beginnings in the previous century. Due to its countless application possibilities, it has attracted the interest of research groups from universities and companies around the world. Thanks to this enormous research effort, the recognition rates achievable with the state-of-the-art face ...
Vitomir Štruc +3 more
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Photometric Accuracy of an Adaptive Filtering Technique
1988The results of an application of the Babelsberg Image Processing System, an adaptive filtering technique, to the two-dimensional photometric mapping of galaxies are reported. On the basis of our studies of NGC 3379 we found no systematic errors in the photometric calibration and in the reduction procedure, with mean residuals from the other studies not
M. Capaccioli, H. Lorenz, G. M. Richter
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Photometric techniques, performance and PSF characterization of GeMS
SPIE Proceedings, 2016GeMS is the multi-conjugate adaptive optics instrument at the Gemini South telescope in Chile, the first facility-class MCAO system and the first to use laser guide stars. During its science verification period we have observed the Galactic globular cluster NGC 1851 and here we discuss the optimization of the analysis techniques that we adopt to ...
Turri, Paolo +6 more
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Photometric scanning techniques for measurement of blood vessel dimensions
Microvascular Research, 1973Abstract Two methods are described for measurement of vessel diameter in the microcirculation. One technique consists of scanning across the vessel with a moving spot of light. The drop in light transmission as the light moves behind the vessel is detected by a photomultiplier tube. The period of time that the spot is hidden behind the vessel is used
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A Photometric Technique for the Quantitative Measurement of Changes in Peripheral Blood Flow
Journal of the American Pharmaceutical Association (Scientific ed.), 1956A technique is described which utilizes a multiplier photometer, Model 520-M, equipped with photo-multiplier tube No. 21-C and an argon light source to measure quantitatively and record the circulatory changes in the skin and striated muscles of anesthetized and unanesthetized laboratory animals.
L E, GALE, P M, SCOTT
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Dynamic photometric stereo—a new technique for moving surface analysis
Image and Vision Computing, 2005This paper describes a novel approach for two- and three-dimensional surface data capture from moving surfaces based upon an evolution of the existing photometric stereo (PS) technique. Limitations in current methods are described, together with the potential benefits of applying PS and the particular need for a new dynamic form of the method ...
Melvyn L. Smith, Lyndon N. Smith
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Illumination Invariant L1 Tracker Using Photometric Normalization Techniques
2013 2nd IAPR Asian Conference on Pattern Recognition, 2013Recently, sparse representation-based tracking methods called l1 trackers give remarkable performances in difficult video sequences. However, the tracking in the situation of large illumination changes and shadow casting still has serious problems that need to be solved.
Vo Quang Nhat +2 more
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Photometric oculometry: A slit-lamp technique for determination of intraocular distances
Graefe's Archive for Clinical and Experimental Ophthalmology, 1985The optics of slit-lamp fluorophotometry were analyzed. This analysis forms the basis of the formulation of a slit-lamp technique called photometric oculometry, which makes it possible to measure intraocular distances. A comparison between ultrasonography and photometric oculometry in the determination of the ocular axial length was carried out ...
B, Krogsaa +3 more
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A more reliable photometric technique for the measurement of scalp sebum excretion
British Journal of Dermatology, 1983The objective assessment of antiseborrhoeic therapy for the scalp requires a reliable technique for the measurement of sebaceous gland activity. Previously published methods were tried but found to be unreliable. This paper describes a photometric technique which gave repeatable results and demonstrated a reduction of sebaceous gland activity on the ...
N B, Simpson, A R, Martin
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Uniqueness for shape from shading via photometric stereo technique
2011 18th IEEE International Conference on Image Processing, 2011We deal with the inverse problem of reconstructing a surface with photometric stereo technique, i.e. using two or more pictures of the surface lighted under different light sources. The new model studied in this paper allows us to extend previous results [1, 2] obtaining a uniqueness result and to solve the classical convex/concave ambiguity of the ...
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