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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 10 — Oct. 1, 2001
  • pp: 2448–2459

On the relationship between radiance and irradiance: determining the illumination from images of a convex Lambertian object

Ravi Ramamoorthi and Pat Hanrahan  »View Author Affiliations


JOSA A, Vol. 18, Issue 10, pp. 2448-2459 (2001)
http://dx.doi.org/10.1364/JOSAA.18.002448


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Abstract

We present a theoretical analysis of the relationship between incoming radiance and irradiance. Specifically, we address the question of whether it is possible to compute the incident radiance from knowledge of the irradiance at all surface orientations. This is a fundamental question in computer vision and inverse radiative transfer. We show that the irradiance can be viewed as a simple convolution of the incident illumination, i.e., radiance and a clamped cosine transfer function. Estimating the radiance can then be seen as a deconvolution operation. We derive a simple closed-form formula for the irradiance in terms of spherical harmonic coefficients of the incident illumination and demonstrate that the odd-order modes of the lighting with order greater than 1 are completely annihilated. Therefore these components cannot be estimated from the irradiance, contradicting a theorem that is due to Preisendorfer. A practical realization of the radiance-from-irradiance problem is the estimation of the lighting from images of a homogeneous convex curved Lambertian surface of known geometry under distant illumination, since a Lambertian object reflects light equally in all directions proportional to the irradiance. We briefly discuss practical and physical considerations and describe a simple experimental test to verify our theoretical results.

© 2001 Optical Society of America

OCIS Codes
(150.0150) Machine vision : Machine vision
(150.2950) Machine vision : Illumination

Citation
Ravi Ramamoorthi and Pat Hanrahan, "On the relationship between radiance and irradiance: determining the illumination from images of a convex Lambertian object," J. Opt. Soc. Am. A 18, 2448-2459 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-10-2448


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