GVF-Based Transfer Functions for Volume Rendering
Transfer function is very important for volume rendering. One common approach is to map the gradient magnitude to opacity transfer functions. However, it catches too many small details. Gradient vector flow (GVF) vectors have large magnitudes in the immediate vicinity of the edges, where the GVF vectors keep coordinate with the vectors of the gradient of the edge map. While in homogeneous regions where the intensity is nearly constant, the magnitudes of gradient vectors are nearly zero and GVF diffuses the edge gradient. Because of these aspects, we extend GVF to color space and apply it for opacity transfer functions. Experiments show that our method enhances edge features and makes a visual effect of diffusing along the edges.
KeywordsTransfer Function Color Space Volume Rendering Active Contour Model Gradient Magnitude
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- 1.Shirley, P., Tuchman, A.: Volume visualization methods for scientific computingGoogle Scholar
- 2.Geiger, B.: Three-dimensional modeling of human organs and its application to diagnosis and surgical planning. PhD thesis, INRIA, France (1993)Google Scholar
- 3.Lorenson, W.E., Cline, H.: Marching cubes: A high-resolution 3D surface construction algorithm. In: Proceedings of SIGGRAPH 1987, pp. 163–169 (1987)Google Scholar
- 6.Westover, L.: Footprint evaluation for volume rendering. Computer graphics 24(4) (1990)Google Scholar