This paper presents an efficient framework for direct volume rendering and manipulation of segmented volume model. A data structure called multi-layer-graph, which includes a multi-layer volume and an assisted run-len...
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This paper presents an efficient framework for direct volume rendering and manipulation of segmented volume model. A data structure called multi-layer-graph, which includes a multi-layer volume and an assisted run-length encoding of the boundary cells, is used to represent the segmented model. Compared to common-used segmented binary volume, the multi-layer model enables the ray casting algorithm to produce much better image quality. Based on the structure feature of the data, techniques such as presence acceleration by boundary projection and rapid gradient estimation are employed to improve performance. For manipulation, basic removing and filling procedures are designed to support practical operations such as cutting, repairing and carving on the volume model, with interactive feedback in 3D scene. Additional improvement in performance can be achieved by multi-core acceleration. All these techniques have been integrated to a system for surgical simulation.
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