Browsing by Subject "otwór 3D"

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Access status: Open Access ,
Segmentacja otworów w obiektach wolumetrycznych
(Wydawnictwa AGH, 2009) Janaszewski, Marcin Sławomir; Babout, Laurent; Postolski, Michał; Jopek, Łukasz
The article presents the new conception of a hole in 3D volumetric objects. The authors have built, implemented and tested a new algorithm of hole segmentation (filling) based on the conception. The algorithm has been tested on artificially generated objects and very complicated 3D objects which represent stress-corrosion crack to be propagated in stainless steel. The article includes also results of the algorithm tests, discussion of its properties and possible applications.
Access status: Open Access ,
Zamykanie otworów w trójwymiarowych obiektach wolumetrycznych
(Wydawnictwa AGH, 2009) Janaszewski, Marcin Sławomir; Babout, Laurent; Postolski, Michał; Jopek, Łukasz
Hole closing in 3D volumetric objects is a challenge in computer science because from a topologieal point of view a hole is not a subset of 3D space. Therefore it is impossible to close a hole by the use of classical methods based on connected component labeling or suppressing filters. The article presents the new algorithm of hole closing based on the algorithm presented by Aktouf e.g. in 2002 year. Algorithm presented in the paper has several advantages in comparison with the Aktouf's approach: only holes are closed but not cavities - bounded by an object disconnected fragments of background. Moreover generated patch which closes a hole corresponds to its 'geometry' and geometry of the patch is not influenced by branches of the object which are situated close to the hole. The algorithm has been tested on artificially generated objects and very complicated 3D objects which represent stress-corrosion crack to be propagated in stainless steel. The article includes also results of the algorithm tests, discussion of its properties and possible applications.