منابع مشابه
Ocular Morbidity among Students in Relation to Classroom Illumination Levels.
OBJECTIVE This cross-sectional study was done to find the prevalence of eye strain and other ocular morbidities among students in Udupi, Karnataka. METHODS The study protocol included interview, visual acuity examination using Snellen chart, and measuring classroom illumination through lux meter. RESULTS 26% students had visual morbidity and the most prevalent symptoms of eyestrain were hea...
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Typical illumination functions contain boundaries that are discontinuous in intensity or derivative. These discontinuities arise from contact between surfaces, and from the penumbra and umbra boundaries of shadows cast by area light sources. In this paper, we present an algorithm that allows for smooth (C) reconstruction of intensity everywhere across a surface except along selected edges of in...
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In this paper we present a simple, robust and efficient algorithm for estimating reflectance fields (i.e., a description of teh transport of light through a scene) for a fixed viewpoint using images of the scene under known natural illumination. Our algorithm treats the scene as a black-box linear system that transforms an input signal (the incident light) into an output signal (the reflected l...
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The study of common classes of diffuse emitters, such as planar convex polygons, reveals several interesting properties of the functions of illumination these emitters cast on receiver surfaces. Some properties, such as the position of the maximum and the curvature are of particular interest for sampling and reconstruction of illumination across receivers. A computationally efficient approach i...
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In several computer graphics areas, a refinement criterion is often needed to decide whether to go on or to stop sampling a signal. When the sampled values are homogeneous enough, we assume that they represent the signal fairly well and we do not need further refinement, otherwise more samples are required, possibly with adaptive subdivision of the domain. For this purpose, a criterion which is...
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ژورنال
عنوان ژورنال: JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
سال: 1923
ISSN: 0019-2341,1349-838X,2185-1506
DOI: 10.2150/jieij1917.7.47