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Title:APROKSIMACIJSKI ALGORITEM GRADNJE SREDNJE OSI ENOSTAVNIH MNOGOKOTNIKOV, TEMELJEČ NA OMEJENI DELAUNAYEVI TRIANGULACIJI
Authors:ID Smogavec, Gregor (Author)
ID Žalik, Borut (Mentor) More about this mentor... New window
Files:.pdf DR_Smogavec_Gregor_2014.pdf (5,02 MB)
MD5: 777F99DFCF6EC780781347AC47CA73CF
 
Language:Slovenian
Work type:Dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:V doktorski disertaciji uvedemo nov postopek gradnje aproksimativne srednje osi, ki je učinkovitejši od obstoječih metod. Naprej opredelimo problem, področja upo-rabe in podamo hipotezi. V nadaljevanju na kratko razložimo Voronoijev diagram in opozorimo na povezavo med njim in Delaunayjevo triangulacijo, ki jo razširimo še z opisom omejene Delaunayjeve triangulacije. Zatem se osredotočimo na algoritme gradnje srednje osi, ki jih delimo na eksaktne in aproksimacijske. Sledijo definicije in pregled dosedanjih rešitev. V jedru doktorske disertacije opišemo nov algoritem za konstrukcijo aproksimacije srednje osi mnogokotnika. V tem poglavju opišemo naš algoritem za triangulacijo enostavnega mnogokotnika, uporabljeno hevristiko in korak generiranja srednje osi iz središč dobljenih trikotnikov. Sledi analiza algoritma, kjer izpeljemo prostorsko in časovno zahtevnost, in primerjava našega algoritma z obstoje-čimi metodami. Razvijemo tudi novo metriko za oceno kakovosti aproksimacije. Dok-torsko disertacijo zaključimo s pregledom opravljenega dela in opozorimo na izvirne znanstvene prispevke.
Keywords:računalniška geometrija, algoritmi, skeleton, srednja os, omejena Delaunayjeva trian-gulacija, Steinerjeve točke
Place of publishing:[Maribor
Publisher:G. Smogavec]
Year of publishing:2014
PID:20.500.12556/DKUM-45072 New window
UDC:004.925.8(043.3)
COBISS.SI-ID:18055958 New window
NUK URN:URN:SI:UM:DK:MXECKZ7L
Publication date in DKUM:19.08.2014
Views:1849
Downloads:205
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FERI
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Secondary language

Language:English
Title:APPROXIMATION ALGORITHM FOR MEDIAL AXIS COMPU-TATION ON SIMPLE POLYGONS USING CONSTRAINED DELAUNAY TRIANGULATION
Abstract:In this doctoral dissertation a new method for approximating a polygon’s medi-al axis is introduced. As shown by experiments, the new method is more efficient than the existing methods. Firstly the definition of the main problem is given. This is fol-lowed by the description of fields, where the medial axis is used, and finished with the hypotheses. In the next chapter, the connection between the Voronoi diagram and the Delaunay triangulation is mentioned, which is followed by the description of the con-strained Delaunay triangulation. In the next chapter, algorithms for medial axis con-struction are described and classified into groups of exact and approximate algo-rithms. This is followed by definitions and an overview of existing methods. The core of this doctoral dissertation is composed of the description of a new algorithm for medial axis construction of a simple polygon. In this chapter, the triangulation, heuristics and the step for medial axis construction out of the triangles circumcentres are described. The next chapter is devoted to the analysis of our algorithm. Here the time and space complexity are derived and the comparison of our algorithm with the existing ones is given. This is followed by the description of a metric, which evaluates the exactness of a polygon’s medial axis. The doctoral dissertation is concluded with evaluation of the hypotheses and an overview of the scientific contributions.
Keywords:computer geometry, algorithms, skeleton, medial axis, constrained Delaunay triangu-lation, Steiner points


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