QUANTITATIVE VISUALISATION OF SURFACES FROM VOLUMETRIC DATA
J. C. Carr, A. H. Gee, R. W. Prager and K. J. Dalton
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.
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