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From: diana@csri.toronto.edu (Diana Li)
Newsgroups: ont.events
Subject: Paul Heckbert, Tuesday 27 June 1989: GRAPHICS SEMINAR
Message-ID: <8906191434.AA13729@ellesmere.csri.toronto.edu>
Date: 19 Jun 89 14:34:10 GMT
Organization: Department of Computer Science, University of Toronto
Lines: 24


                   UNIVERSITY OF TORONTO SEMINAR NOTICE
             (GB = Gailbraith Building, 35 St. George Street)

       -------------------------------------------------------------

                             GRAPHICS SEMINAR
                GB 120, at 11:00 a.m., Tuesday 27 June 1989

                               Paul Heckbert
                   University of California at Berkeley

                   "Filters for Ideal Image Resampling"

The applications of texture mapping in computer graphics and image
distortion in image processing both require the resampling of one image
into another according to a two-dimensional mapping.  We develop a theory
describing the shape of filter needed for perfect antialiasing during the
resampling implied by an arbitrary mapping.  For affine mappings the
resampling grid is uniform and the required "resampling filter" is space
invariant.  The theory for ideal resampling in such cases is well known but
the theory for arbitrary mappings has heretofore been lacking.  An
approximation to the ideal can be implemented using filters with elliptical
regions and Gaussian cross section.