Vignetting is a caused by internal aperatures in a lens. It causes different
responses for different pixels, usually darkening along the edges. This differs
from the cos^4 falloff from a thins lens.

In the Radiance Self Calibration paper, lens vignetting was introduced as an error source, is intrinsic camera calibration a solution to the problem or am i not understanding exactly what vignetting is?

The February 4 class will include:

Langer, M.S., Zucker, S.W., What is a light source?, IEEE Conf. on Computer Vision and Pattern Recognition (CVPR) 1997, pp. 172-178

"What can be Known about the Radiometric Response Function from Images ?" . M. D. Grossberg, S. K. Nayar , Proc. of European Conference on Computer Vision (ECCV) 2002.
    
 "Radiometric Self Calibration", T. Mitsunaga ,S. K. Nayar, Proceedings of IEEE Conference on Computer Vision and Pattern Recognition, 1999.

P. E. Debevec, J. Malik. Recovering High Dynamic Range Radiance Maps from Photographs. In SIGGRAPH 97, August 1997.
 
Paul E. Debevec. Rendering Synthetic Objects into Real Scenes: Bridging Traditional and Image-Based Graphics with Global Illumination and High Dynamic Range Photography. SIGGRAPH 98, 1998. PDF version