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Koliko točk določa katero geometrijsko ploskev?
ID
POLANC, MIHA
(
Author
),
ID
Fijavž, Gašper
(
Mentor
)
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MD5: 289B8D40043CEF39E02B5E080BCF3C34
PID:
20.500.12556/rul/4954936c-61e7-4942-8015-fe56a13f5514
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Abstract
Geometrijsko ploskev lahko približno opišemo s končnim vzorcem njenih točk. V delu se ukvarjamo z vprašanjem, s koliko točkami, glede na način vzorčenja in rod ploskve, lahko zanesljivo rekonstruiramo originalno geometrijsko ploskev. Najprej opišemo različne načine vzorčenja točk s ploskve, kaj je enakomerni in kaj je slučajni vzorec točk z izbrane ploskve. Vzorce lahko obravnavamo s topološkimi metodami, natančneje metodami vztrajne homologije. Iz vzorca točk s programskim paketom Javaplex konstruiramo filtracijo Vietoris-Ripsovih simplicialnih kompleksov in opazujemo črtni diagram Bettijevih števil. V zaključku predstavimo računske rezultate za sfero in torus glede na različna modela vzorčenja, ter nekaj možnosti za nadaljnje izboljšave.
Language:
Slovenian
Keywords:
Vietoris-Ripsov kompleks
,
Bettijeva števila
,
Javaplex
,
vztrajna homologija
,
sfera
,
torus.
Work type:
Undergraduate thesis
Organization:
FRI - Faculty of Computer and Information Science
Year:
2016
PID:
20.500.12556/RUL-85894
Publication date in RUL:
28.09.2016
Views:
1924
Downloads:
660
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POLANC, MIHA, 2016,
Koliko točk določa katero geometrijsko ploskev?
[online]. Bachelor’s thesis. [Accessed 3 July 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=85894
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English
Title:
How many points are needed to determine a geometric surface?
Abstract:
A geometric surface can be approximately described using a finite point-sample. The main question of this thesis is the following: how many points, depending on the sampling model and surface genus, are needed to confidently reconstruct the original geometric surface. First we present different sampling models of surface points — the uniform and the random sample. We use topological methods, in particular persistent homology, to process our data. Using Javaplex software package we construct a filtration with Vietoris-Rips simplicial complexes and consider the bar-code diagram of its Betti numbers. Finally we present our computational results for both the sphere and the geometric torus with respect to the two sampling models , and several options for further improvements.
Keywords:
Vietoris-Rips complex
,
Betti numbers
,
Javaplex
,
persistent homology
,
sphere
,
torus.
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