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Appeared in Int'l Conf. on Computer Vision, Vol. 1, pp. 472-479, 2001 c 2001 IEEE
 

Summary: Appeared in Int'l Conf. on Computer Vision, Vol. 1, pp. 472-479, 2001
c 2001 IEEE
On Cosine-fourth and Vignetting E ects in Real Lenses
Manoj Aggarwal Narendra Ahuja
University of Illinois at Urbana-Champaign
405 N. Mathews Ave, Urbana, IL 61801, USA
fmanoj,ahujag@vision.ai.uiuc.edu
Abstract
This paper has been prompted by observations of dis-
parities between the observed fall-o in irradiance for
o -axis points and that accounted for by the cosine-
fourth and vignetting e ects. A closer examination of
the image formation process for real lenses revealed that
even in the absence of vignetting a point light source
does not uniformly illuminate the aperture, an e ect
known as pupil aberration. For example, we found the
variation for a 16mm lens to be as large as 31% for
a eld angle of 10 . In this paper, we critically evalu-
ate the roles of cosine-fourth and vignetting e ects and
demonstrate the signi cance of the pupil aberration on

  

Source: Ahuja, Narendra - Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign

 

Collections: Computer Technologies and Information Sciences; Engineering