for sharing their unpublished work (at the University of Toronto) on segmentation and pose estimation that motivated us to "think globally, fit locally"; J. Tenenbaum (Stanford University) for many stimulating discussions about his work (4) and for sharin (0)

by We thank G Hinton, M Revow
Venue:S.T.R. acknowledges the support of the Gatsby Charitable Foundation, the U.S. National Science Foundation, and the National Sciences and Engineering Research Council of Canada. 7 August 2000; accepted 17 November 2000 sIl I Fww. an