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unfolding, one of virtual endoscopy techniques, gives us a flatten image of the inner surface of an organ. it is more...order to avoid intersection between ray-cones, it adjusts direction of ray-cones detected while testing intersection.
lastly, it determines direction of all rays fired from sample points between...
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...more precisely. the most commonly used unfolding method is to cast rays radially along a pre-computed camera path. however, this may produce images of false pathological structures. details on...we propose an efficient method of penetration-free ray casting for unfolding. it computes ray planes that do not intersect neighboring planes, using the noble intersection avoidance method...
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...in virtual endoscopy, it is important to devise the navigation method that enables us to control the position and orientation
of virtual camera easily and intuitively without...for current frame with volume ray casting method, then computes new viewing
specification of camera for the next frame using the depth information. it can...
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...visibility determination algorithm for interactive virtual endoscopy. the algorithm uses a modified version of template-based ray casting to extract a view dependent set of potentially visible voxels from volume...a quadtree subdivision algorithm is used to reduce the number of cast rays. compared to other recently proposed rendering algorithms for virtual endoscopy, our rendering algorithm does not...
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...visibility determination algorithm for interactive virtual endoscopy. the algorithm uses a modified version of template-based ray casting to extract a view dependent set of potentially visible voxels from volume...a quadtree subdivision algorithm is used to reduce the number of cast rays. compared to other recently proposed rendering algorithms for virtual endoscopy, our rendering algorithm does not...
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virtual endoscopy is an important tool for...navigation aid during a physical endoscopy process. one of the strengths of virtual endoscopy is that not only the...
Published in 2002.
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...medical applications because it gives us unfold images of the inner surface in an organ. however,
since conventional unfold methods generate only 2d images...it, we propose an efficient unfolding
method using surface reconstruction. firstly, we generate a 2d unfold image using volume ray casting. at the same time...
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...paper describes an implementatio n of a surface based rendering algorithm used for virtual colonoscopy. the colon surface data...rendered depending on their visibility using graphics hardware capable of triangle rasterisation. the implementation of the rendering algorithm is embedded into the virtual endoscopy environment viren....
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...the majority of virtual endoscopy techniques tries to simulate a real endoscopy. a real endoscopy does not always give the...a central path induces nonlinear rays for unambiguous parameterization of the surface. the second step compensates for locally varying distortions of the unfolded surface. a technique similar to...
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...the majority of virtual endoscopy techniques tries to simul ate a real endoscopy. a real endoscopy does not always give the...a central path induces nonlinear rays for un- ambiguous parameterization of the surface. the second step com- pensates for locally varying distortions of the unfolded su rface. a technique similar...