On cosine-fourth and vignetting effects in real lenses

M. Aggarwal, H. Hua, N. Ahuja

Research output: Contribution to conferencePaper

30 Scopus citations

Abstract

This paper has been prompted by observations of disparities between the observed fall-off in irradiance for off-axis points and that accounted for by the cosine-fourth and vignetting effects. 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 effect known as pupil aberration. For example, we found the variation for a 16mm lens to be as large as 31% for a field angle of 10°. In this paper, we critically evaluate the roles of cosine-fourth and vignetting effects and demonstrate the significance of the pupil aberration on the fall-off in irradiance away from image center. The pupil aberration effect strongly depends on the aperture size and shape and this dependence has been demonstrated through two sets of experiments with three real lenses. The effect of pupil aberration is thus a third important cause of fall in irradiance away from the image center in addition to the familiar cosine-fourth and vignetting effects, that must be taken into account in applications that rely heavily on photometric variation such as shape from shading and mosaicing.

Original languageEnglish (US)
Pages472-479
Number of pages8
StatePublished - Jan 1 2001
Externally publishedYes
Event8th International Conference on Computer Vision - Vancouver, BC, United States
Duration: Jul 9 2001Jul 12 2001

Other

Other8th International Conference on Computer Vision
CountryUnited States
CityVancouver, BC
Period7/9/017/12/01

ASJC Scopus subject areas

  • Software
  • Computer Vision and Pattern Recognition

Fingerprint Dive into the research topics of 'On cosine-fourth and vignetting effects in real lenses'. Together they form a unique fingerprint.

  • Cite this

    Aggarwal, M., Hua, H., & Ahuja, N. (2001). On cosine-fourth and vignetting effects in real lenses. 472-479. Paper presented at 8th International Conference on Computer Vision, Vancouver, BC, United States.