This work addresses the issue of uncertainties introduced during the process of direct volume rendering (DVR). Specifically, different DVR algorithms produce slightly (some drastically) different images. We investigate methods for visualizing and explaining these differences. One of the key tasks is to simulate different DVR algorithms using a base or common method. To date, we have some preliminary results using two different base methods: ray-based and projection-based. We also demonstrate that the simulation of DVR algorithms with a common base algorithm is reversible. That is, if a ray-based algorithm can be simulated with a projection-based algorith, then a projection-based algorithm can be simulated by a ray-based algorithm.
Ray-based Data Level Comparisons of Direct Volume Rendering Algorithms
in Scientific Visualization, Dagstuhl'97, edited by Hans Hagen, Gregory Nielson, and Frits Post, IEEE 1999, pp. 137-150, 347.
A Methodology for Comparing Direct Volume Rendering
Algorithms Using a Projection-Based Data Level Approach
in Eurographics/IEEE TVCG Symposium on Visualization, May 1999, Vienna, Austria, pp. 87-98.
Data Level Comparisons of Surface Classifications and Gradient Filters
to appear in Volume Graphics 2001. Click for submitted version (2 column, longer) and/or Springer-Verlag version (1 column, shorter).
Extended Specifications and Test Data Sets for
Data Level Comparisons of Direct Volume Rendering Algorithms
to appear in Transactions on Visualization and Computer Graphics 2001. Also available as Technical Report HPL-2000-40R1, Hewlett-Packard Laboratories, Palo Alto, CA, Mar. 2001.