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Geometric Point Light Source Calibration
"... We present a light position calibration technique based on a general arrangement of at least two reflective spheres in a single image. Contrary to other techniques we do not directly intersect rays for triangulation but instead solve for the optimal light position by evaluating the imagespace error ..."
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space error of the light highlights reflected from the spheres. This approach has been very successful in the field of StructurefromMotion estimation. It has not been applied to light source calibration because determining the reflection point on the sphere to project the highlight back in the image is a
Photometric Linearization under Near Point Light Sources
"... We present a method for generating linearized images that consist of onlydiffuse reflection from images taken under near point light sources.Previous photometriclinearization method cannot work under near point light sources,since it assumes parallel light. For satisfying this assumption,our method ..."
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We present a method for generating linearized images that consist of onlydiffuse reflection from images taken under near point light sources.Previous photometriclinearization method cannot work under near point light sources,since it assumes parallel light. For satisfying this assumption,our method
The geometry of point light source from shadows
, 2004
"... Shadows provide valuable information about the scene geometry, especially the whereabout of the light source. This paper investigates the geometry of point light sources and cast shadows. It is known that there is redundancy in the objectshadow correspondences. We explicitly show that no matter h ..."
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Cited by 1 (1 self)
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Shadows provide valuable information about the scene geometry, especially the whereabout of the light source. This paper investigates the geometry of point light sources and cast shadows. It is known that there is redundancy in the objectshadow correspondences. We explicitly show that no matter
A Practical Method for Estimation of Point LightSources
 PROCEEDINGS BMVC 2001
, 2001
"... We introduce a general model for point lightsources and show how the parameters of a source at finite distance can be estimated by shading on an object with known geometry and Lambertian reflectance. The parameters we estimate include not only the direction but also the location of the source. Furt ..."
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Cited by 9 (2 self)
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We introduce a general model for point lightsources and show how the parameters of a source at finite distance can be estimated by shading on an object with known geometry and Lambertian reflectance. The parameters we estimate include not only the direction but also the location of the source
Performance Analysis of Point Light Source Estimation
, 1999
"... In this paper, the performance of point light source parameter estimation from two video images is analyzed in terms of estimation theory. The illumination parameters are the intensity and direction of a single distant point light source in presence of ambient light. Known illumination estimation me ..."
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In this paper, the performance of point light source parameter estimation from two video images is analyzed in terms of estimation theory. The illumination parameters are the intensity and direction of a single distant point light source in presence of ambient light. Known illumination estimation
A Practical Method for Estimation of Point LightSources
 proceedings BMVC 2001
, 2001
"... We introduce a general model for point lightsources and show how the parameters of a source at finite distance can be estimated by shading on an object with known geometry and Lambertian reflectance. The parameters we estimate include not only the direction but also the location of the source. Furt ..."
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We introduce a general model for point lightsources and show how the parameters of a source at finite distance can be estimated by shading on an object with known geometry and Lambertian reflectance. The parameters we estimate include not only the direction but also the location of the source
Illuminating The Free Space Between Quadrilaterals With Point Light Sources
 PROC. COMPUTER GRAPHICS INT.,. WORLD SCIENTIFIC
, 1994
"... Let S be a set of n pairwisedisjoint, possibly nonconvex, quadrilaterals in the plane. We consider the problem of illuminating the "free" space, i.e., the region of the plane excluding the interiors of the quadrilaterals (which act as barriers), by using point light sources. We show that ..."
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Cited by 3 (0 self)
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Let S be a set of n pairwisedisjoint, possibly nonconvex, quadrilaterals in the plane. We consider the problem of illuminating the "free" space, i.e., the region of the plane excluding the interiors of the quadrilaterals (which act as barriers), by using point light sources. We show
Calibrating a Nonisotropic Near Point Light Source using a Plane
"... We show that a nonisotropic near point light source rigidly attached to a camera can be calibrated using multiple images of a weakly textured planar scene. We prove that if the radiant intensity distribution (RID) of a light source is radially symmetric with respect to its dominant direction, then ..."
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Cited by 1 (1 self)
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We show that a nonisotropic near point light source rigidly attached to a camera can be calibrated using multiple images of a weakly textured planar scene. We prove that if the radiant intensity distribution (RID) of a light source is radially symmetric with respect to its dominant direction
Shape reconstruction from an endoscope image by Shape from Shading technique for a point light source at the projection
 and Image Underst
, 1997
"... A new application of the factorization method is reported for 3D shape reconstruction from endoscope image sequences. The feasibility of the method is verified with some theoretical considerations and results of many kinds of extensive experiments. ..."
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Cited by 45 (0 self)
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A new application of the factorization method is reported for 3D shape reconstruction from endoscope image sequences. The feasibility of the method is verified with some theoretical considerations and results of many kinds of extensive experiments.
Python and MatPlotLib based Open Source Software System for Simulating Images with point Light Sources in Attenuating and Scattering Media
"... Simulating images of various objects in a real world scene has wide applications while testing algorithms for machine vision applications as well as in computer graphics and gaming software industry. Most current algorithms use collimated light sources and assume the medium to be nonscattering and ..."
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, scatter and attenuate light. A software system that makes no such assumptions and uses point light sources in scattering and attenuating media has been developed. Another novelty of current work is use of open source Python programming language along with associated 2D graphics and plotting library, MatPlotLib.
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