Stochastic Modelling and Reconstruction of Random Shapes
(2003) In Doctoral Theses in Mathematical Sciences 2003:1.- Abstract
- This thesis originates from the problem of reconstructing the three-dimensional shape of objects, when the only available data are two-dimensional images. The solution presented is based on stochastic models for random object shapes and measurements, in combination with practical surface representation and simulation methods.
As a means to handle general, unknown object types, stochastic models for approximating known smooth surfaces as well as generating random smooth surfaces is developed. By also constructing statistical models for measured data, shape estimates can be obtained by application of Bayes' formula. For this purpose, Markov chain Monte Carlo (MCMC) simulation algorithms for the surface models are... (More) - This thesis originates from the problem of reconstructing the three-dimensional shape of objects, when the only available data are two-dimensional images. The solution presented is based on stochastic models for random object shapes and measurements, in combination with practical surface representation and simulation methods.
As a means to handle general, unknown object types, stochastic models for approximating known smooth surfaces as well as generating random smooth surfaces is developed. By also constructing statistical models for measured data, shape estimates can be obtained by application of Bayes' formula. For this purpose, Markov chain Monte Carlo (MCMC) simulation algorithms for the surface models are developed.
Since it is impossible to exactly represent all surfaces in a computer, it is necessary to develop discrete representations, that can be used in estimation algorithms. In this thesis, two spline surface construction methods are developed, one based on triangular Bézier patches, and one based on subdivision techniques. Both methods use control points and normal vectors, so that local control of surface positions and tangent plane orientations is possible.
In addition to surface representations and distributions, an efficient data type and an operator history system are presented, that enable the practical use of variable dimension MCMC simulation, by taking care of the complicated operations necessary to allow changing the structure of the spline surface representation during the simulation. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/21282
- author
- Lindgren, Finn LU
- supervisor
- opponent
-
- Professor Rue, Håvard, Norwegian University of Science and Technology, Trondheim
- organization
- publishing date
- 2003
- type
- Thesis
- publication status
- published
- subject
- keywords
- operations research, Statistics, operationsanalys, Statistik, programmering, aktuariematematik, actuarial mathematics, programming
- in
- Doctoral Theses in Mathematical Sciences
- volume
- 2003:1
- pages
- 150 pages
- publisher
- Mathematical Statistics, Centre for Mathematical Sciences, Lund University
- defense location
- Lecture hall MH:A, Centre for Mathematical Sciences, Sölvegatan 18, Lund Institute of Technology
- defense date
- 2003-06-06 10:15:00
- ISSN
- 1404-0034
- ISBN
- 91-628-5701-0
- language
- English
- LU publication?
- yes
- id
- 8a77516e-9ec1-42ba-9d69-cf58bf644be8 (old id 21282)
- date added to LUP
- 2016-04-01 15:38:38
- date last changed
- 2019-05-21 13:31:20
@phdthesis{8a77516e-9ec1-42ba-9d69-cf58bf644be8,
abstract = {{This thesis originates from the problem of reconstructing the three-dimensional shape of objects, when the only available data are two-dimensional images. The solution presented is based on stochastic models for random object shapes and measurements, in combination with practical surface representation and simulation methods.<br/><br>
<br/><br>
As a means to handle general, unknown object types, stochastic models for approximating known smooth surfaces as well as generating random smooth surfaces is developed. By also constructing statistical models for measured data, shape estimates can be obtained by application of Bayes' formula. For this purpose, Markov chain Monte Carlo (MCMC) simulation algorithms for the surface models are developed.<br/><br>
<br/><br>
Since it is impossible to exactly represent all surfaces in a computer, it is necessary to develop discrete representations, that can be used in estimation algorithms. In this thesis, two spline surface construction methods are developed, one based on triangular Bézier patches, and one based on subdivision techniques. Both methods use control points and normal vectors, so that local control of surface positions and tangent plane orientations is possible.<br/><br>
<br/><br>
In addition to surface representations and distributions, an efficient data type and an operator history system are presented, that enable the practical use of variable dimension MCMC simulation, by taking care of the complicated operations necessary to allow changing the structure of the spline surface representation during the simulation.}},
author = {{Lindgren, Finn}},
isbn = {{91-628-5701-0}},
issn = {{1404-0034}},
keywords = {{operations research; Statistics; operationsanalys; Statistik; programmering; aktuariematematik; actuarial mathematics; programming}},
language = {{eng}},
publisher = {{Mathematical Statistics, Centre for Mathematical Sciences, Lund University}},
school = {{Lund University}},
series = {{Doctoral Theses in Mathematical Sciences}},
title = {{Stochastic Modelling and Reconstruction of Random Shapes}},
volume = {{2003:1}},
year = {{2003}},
}