Název:	An algorithm for fast voxel scene traversal
Autoři:	Šrámek, Miloš
Citace zdrojového dokumentu:	Journal of WSCG. 1994, vol. 2, no. 1-2, p. 207-220.
Datum vydání:	1994
Nakladatel:	Václav Skala - UNION Agency
Typ dokumentu:	článek article
URI:	http://wscg.zcu.cz/wscg1994/wscg94.htm http://hdl.handle.net/11025/16080
ISSN:	1213-6972 (print) 1213-6980 (CD-ROM) 1213-6964 (online)
Klíčová slova:	skenování 3D dat;3D rekonstrukce dat;vizualizace;algoritmus
Klíčová slova v dalším jazyce:	scanning 3D data;3D reconstruction of the datas;visualization;algorithm
Abstrakt v dalším jazyce:	Together with improvement of tomographic methods of scanning 3D data, residing in an increase of distinguishing ability of the scanners, the quality of final 3D reconstruction of the data comes into foreground. An inevitable condition for visualization of small details, comparable with the voxel size is application of such algorithms, which enables to define a surface of the scanned object on subvoxel level. Coming out from paper published at previous year of Winter School on Computer Graphics and CAD Systems we present an algorithm for fast traversal of the voxel scene, which enables to find a nearest intersection of a ray with the object surface defined in such a way. High speed of the algorithm utilizes object coherency of the scene, which means that voxels belonging to the object are usually grouped in connected regions. The algorithm consist from two steps: preprocessing and scene traversal. In the preprocessing phase we assign to each background voxel of the segmented scene a value equal to its chessboard distance from the nearest object voxel, which defines a basic macro region with no object voxel inside. While generating a discrete ray, we can jump over this region, which results in up to 6-fold speed up of the traversal. The algorithm has no additional demands on memory, since the distance is stored in originally "empty" background voxels.
Práva:	© Václav Skala - UNION Agency
Vyskytuje se v kolekcích:	Volume 2, number 1-2 (1994)

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