A Pre-attributed Resampling Algorithm for Controlled-Precision Volume Ray-Casting

概要

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Accurate volume rendering is essential for some visualization applications, e.g., medical imaging. However, the computationally expensive feature of conventional volume rendering algorithms for high-quality image generation has restricted their practical use. In this paper, we propose a pre-attributed resampling algorithm that accomplishes controlled-precision volume ray-casting at low computational coste. This algorithm changes resampling intervals based on numerical errors of the volume rendering integral so that the number of resampling points becomes minimum for a given error bound. Besides, to reduce computational costs for resampling, a simple interpolation method is applied to resampling points in regions where intensities and opacities are constant. To suppress the overhead of precision control, information on the numerical errors and the constant regions is obtained for each voxel in pre-processing, and then related to volume data as voxel attributes. The experimental results demonstrate that the proposed algorithm outperforms conventional ray-casting algorithms without precision control for accurate visualization in termes of accuracy/processing-time performance.
一般社団法人情報処理学会の論文
2000-08-15