QUANTITATIVE VISUALISATION OF SURFACES FROM VOLUMETRIC DATA
J. C. Carr, A. H. Gee, R. W. Prager and K. J. Dalton
Februrary 1998
A 3D B-spline quasi-interpolant is used to extract smooth iso-value surfaces from volume data. In this technique discretization and partial voluming artifacts are reduced by approximating sampled data at voxel centres. Surface normals, necessary for realistic shading, are analytically defined by the approximating function rather than estimated by in an ad hoc way from the volume data. We consider an application where bone surfaces are revealed from CT data by ray-casting and the surfaces are then used to construct models and prostheses. Accurate determination and rendering of bone surfaces is required. A Z-buffer shading technique is also described for improved rendering of surface depth-maps.
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.