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Visual Objects in the Global Graph Open Access


Other title
computer vision
image analysis
Type of item
Degree grantor
University of Alberta
Author or creator
Dung, Joseph
Supervisor and department
Rockwell, Geoffrey (Humanities Computing)
Examining committee member and department
Gouglas, Sean (Humanities Computing)
Quamen, Harvey (Humanities Computing)
Humanities Computing

Date accepted
Graduation date
Master of Arts
Degree level
Here, we use the premise of an actual image-retrieval application to examine how various approaches and techniques in computer vision help to bridge the much talked about semantic gap. A lot of cross-fertilization of ideas from the world of text processing has found its way into image processing as well. When images are processed for various purposes, their low-level features usually bear no resemblance with the types of concepts used in describing them. When tasked with developing a useful image model, most strategies take a data-driven or ontological route, or a combination of both. Whatever strategy is adopted, we observe how different image contexts are used to derive some type of semantic knowledge. In this study, we provide an analysis of how an ontological model can be derived from the structural composition of clustered features that result from an image-retrieval task, especially focusing on error pairs. In other words, we explore the additional contexts in which the semantic gap can be narrowed, when the search context for images relative to a large database of features, is also narrowed. We use a small sample of games set to train and eventually test how effective our image-retrieval task can find and match an image based on its low-level features. In so doing, we had wanted to create the basis for potentially pairing these unique low-level features to a higher-level concept based on scene class, for instance. But ultimately for each image-retrieval task, we keenly recognize when errors do occur, under different object descriptor and search strategies, and particularly look out for consistent error patterns across these descriptors, based on the retrieved results from an image search. We discover an additional context for deriving semantic knowledge about the query image, providing for the basis to develop another data-driven ontological model.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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