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UBC Theses and Dissertations
Tracking the joints of articulated objects without an a priori shape model Leonard, Simon
Abstract
The conventional methodology for tracking articulated objects relies on the knowledge of a shape model of the tracked object. The disadvantage of these top-down methods is their dependence on many assumptions, controlled environment and a priori knowledge. To be able to track and analyze arbitrary articulated motion, a radically different approach is necessary. This thesis proposes a method that addresses the lack of generality and adaptability of previous tracking systems for articulated objects. The method is built around an appropriate generic representation of articulated objects, which is a simple structural representation based on the joints configuration. The introduced method is a bottom-up approach able of detecting the joints of a moving object without any knowledge or assumptions. The method starts by extracting the moving contours of the object. Then the Hausdorff distance is used to decompose the contours into rigid components. From this decomposition, the joints are found by detecting the intersecting edge segments between adjacent components. Finally, the joints are then tracked by using an ad hoc deterministic version of the CONDENSATION algorithm.
Item Metadata
Title |
Tracking the joints of articulated objects without an a priori shape model
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2002
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Description |
The conventional methodology for tracking articulated objects relies on the
knowledge of a shape model of the tracked object. The disadvantage of these
top-down methods is their dependence on many assumptions, controlled environment
and a priori knowledge. To be able to track and analyze arbitrary
articulated motion, a radically different approach is necessary. This thesis
proposes a method that addresses the lack of generality and adaptability of
previous tracking systems for articulated objects. The method is built around
an appropriate generic representation of articulated objects, which is a simple
structural representation based on the joints configuration. The introduced
method is a bottom-up approach able of detecting the joints of a moving object
without any knowledge or assumptions. The method starts by extracting
the moving contours of the object. Then the Hausdorff distance is used to
decompose the contours into rigid components. From this decomposition, the
joints are found by detecting the intersecting edge segments between adjacent
components. Finally, the joints are then tracked by using an ad hoc deterministic
version of the CONDENSATION algorithm.
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Extent |
7419423 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-08-13
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0051673
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2002-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.