Display of surfaces from volume data
TL;DR: In this article, a volume-rendering technique for the display of surfaces from sampled scalar functions of 3D spatial dimensions is discussed, which is not necessary to fit geometric primitives to the sampled data; images are formed by directly shading each sample and projecting it onto the picture plane.
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Abstract: The application of volume-rendering techniques to the display of surfaces from sampled scalar functions of three spatial dimensions is discussed. It is not necessary to fit geometric primitives to the sampled data; images are formed by directly shading each sample and projecting it onto the picture plane. Surface-shading calculations are performed at every voxel with local gradient vectors serving as surface normals. In a separate step, surface classification operators are applied to compute a partial opacity of every voxel. Operators that detect isovalue contour surfaces and region boundary surfaces are examined. The technique is simple and fast, yet displays surfaces exhibiting smooth silhouettes and few other aliasing artifacts. The use of selective blurring and supersampling to further improve image quality is described. Examples from molecular graphics and medical imaging are given. >
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Citations
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William E. Lorensen,Harvey E. Cline +1 more
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TL;DR: In this paper, a divide-and-conquer approach is used to generate inter-slice connectivity, and then a case table is created to define triangle topology using linear interpolation.
Illumination for computer generated pictures
TL;DR: Human visual perception and the fundamental laws of optics are considered in the development of a shading rule that provides better quality and increased realism in generated images.
Compositing digital images
Thomas K Porter,Thomas Douglas Selkirk Duff +1 more
- 01 Jan 1984
TL;DR: In this article, a matte component can be computed similarly to the color channels for four-channel pictures, and guidelines for the generation of elements and arithmetic for their arbitrary compositing are discussed.
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Compositing digital images
PorterThomas,DuffTom +1 more
TL;DR: Most computer graphics pictures have been computed all at once, so that the rendering program takes care of all computations relating to the overlap of objects.
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Shading 3D-Images from CT Using Gray-Level Gradients
Karl Heinz Höhne,Ralph Bernstein +1 more
TL;DR: For the 3D-reconstruction of organ surfaces from tomograms, a shading method based on the partial volume effect is presented and it is shown, that at least for bone and soft tissue surfaces, the results are superior to conventional shading.
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