Abstract for treece_tr379

Cambridge University Engineering Department Technical Report CUED/F-INFENG/TR379


G.M.Treece, R.W.Prager and A.H.Gee

April 2000

The metamorphosis (commonly known as morphing) of one image into another is a well studied subject that has frequently been used to create impressive visual effects. There has been significant work recently in three-dimensional (3-D) metamorphosis, where a surface is transformed into another surface. One approach is to construct discrete volume representations of the surfaces and interpolate between them to create intermediate volumes. With the advance of volume graphics, these volumes can be directly rendered in real time, or alternatively one of the many isosurface extraction techniques can be used to construct a polygonal mesh from each volume for rendering using standard hardware. This technique is independent of the surface topology, which enables morphing between surfaces of completely different shape - however it can also lead to unrealistic intermediate surfaces which have different topology from the originals. We present a method for correcting this problem by automatically calculating region correspondence derived from a representation of each surface as a set of spheres. We also show how this can be combined with a simple method for manually defining correspondence. In combination, this proves to be a fast and flexible method for morphing surfaces, as demonstrated on a wide range of examples.

| (ftp:) treece_tr379.ps.gz | (http:) treece_tr379.ps.gz | (ftp:) treece_tr379.pdf | (http:) treece_tr379.pdf |

If you have difficulty viewing files that end '.gz', which are gzip compressed, then you may be able to find tools to uncompress them at the gzip web site.

If you have difficulty viewing files that are in PostScript, (ending '.ps' or '.ps.gz'), then you may be able to find tools to view them at the gsview web site.

We have attempted to provide automatically generated PDF copies of documents for which only PostScript versions have previously been available. These are clearly marked in the database - due to the nature of the automatic conversion process, they are likely to be badly aliased when viewed at default resolution on screen by acroread.