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Investigation of shape representation using sensitivity to axis and part based transformations
Descriptive
TypeOfResource
Text
TitleInfo
(ID = T-1)
Title
Investigation of shape representation using sensitivity to axis and part based transformations
Identifier
ETD_2778
Identifier
(type = hdl)
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056288
Language
LanguageTerm
(authority = ISO639-2);
(type = code)
eng
Genre
(authority = marcgt)
theses
Subject
(ID = SBJ-1);
(authority = RUETD)
Topic
Psychology
Subject
(ID = SBJ-2);
(authority = ETD-LCSH)
Topic
Shapes
Subject
(ID = SBJ-3);
(authority = ETD-LCSH)
Topic
Contact transformations
Abstract
(type = abstract)
Part-based approaches organize global shape in terms of segmented parts and their spatial relationships, and are robust under transformations such as articulating limbs that are common in biological objects. It is well documented that transformations that alter qualitative part structure of a shape are more noticeable than those that do not. However, previous work has not compared sensitivity to transformations that change quantitative parameters involving the spatial relationships between parts, without altering the shape's qualitative part structure. Shape transformations were applied to a protruding part attached to a larger base (two-axial-branch shape: Experiment 1) or to a simple elongated shape (single- axis shape, Experiment 2): length, width, curvature, orientation, and location change of the part. Using a 2IFC task, increment thresholds were derived, and in Experiments 1 and 2 were converted into common metrics to enable comparison across transformations. Higher sensitivity was found for transformations involving the intrinsic parameters of a single axial branch such as length, width, curvature, and lower sensitivity for those involving two axial branches such as orientation, location, providing evidence for the single-part superiority effect. In Experiment 3, the orientation of the shapes (two-part and single-part) varied randomly on each trial. Results showed no benefit in sensitivity provided by presence of the base in the two-part shape in Experiment 1. In Experiment 4, the influence of surface, as opposed to contour, geometry was investigated by manipulating figure and ground regions defined by a fixed contour using stereoscopic depth. A protrusion (a positive part) in the figure region corresponded to an indentation in the complementary region (a negative part). Two conditions were tested, orientation and location; for each, sensitivity to positive and negative part changes was compared. Sensitivity was better for positive compared to negative parts in the case of orientation, indicating differential processing for transformations that are biologically plausible; no difference was found for location. Even when sensitivities were compared using a common scale, different transformations elicited very different sensitivities, indicating that purely physical measures of shape similarity are inadequate for perceptual similarity. The results also indicate that shape sensitivity depends on both contour and surface geometry.
PhysicalDescription
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electronic resource
Extent
xiii, 146 p. : ill.
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application/pdf
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text/xml
Note
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Ph.D.
Note
(type = bibliography)
Includes bibliographical references
Note
(type = vita)
Includes vita
Note
(type = statement of responsibility)
by Kristina Denisova
Name
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Denisova
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Kristina
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author
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Kristina Denisova
Name
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NamePart
(type = family)
Singh
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Manish
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chair
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Advisory Committee
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Manish Singh
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NamePart
(type = family)
Kowler
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(type = given)
Eileen
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internal member
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Advisory Committee
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Eileen Kowler
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NamePart
(type = family)
Feldman
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Jacob
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internal member
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Advisory Committee
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Jacob Feldman
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NamePart
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DeCarlo
NamePart
(type = given)
Doug
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(authority = RULIB)
outside member
Affiliation
Advisory Committee
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Doug DeCarlo
Name
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NamePart
Rutgers University
Role
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degree grantor
Name
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NamePart
Graduate School - New Brunswick
Role
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(authority = RULIB)
school
OriginInfo
DateCreated
(qualifier = exact)
2010
DateOther
(qualifier = exact);
(type = degree)
2010
RelatedItem
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TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier
(type = RULIB)
ETD
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
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rucore19991600001
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NjNbRU
Identifier
(type = doi)
doi:10.7282/T3CF9PVW
Genre
(authority = ExL-Esploro)
ETD doctoral
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Rights
RightsDeclaration
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(ID = rulibRdec0006)
The author owns the copyright to this work.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
RightsHolder
(ID = PRH-1);
(type = personal)
Name
FamilyName
Denisova
GivenName
Kristina
Role
Copyright Holder
RightsEvent
(ID = RE-1);
(AUTHORITY = rulib)
Type
Permission or license
DateTime
2010-07-12 10:15:56
AssociatedEntity
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(AUTHORITY = rulib)
Role
Copyright holder
Name
Kristina Denisova
Affiliation
Rutgers University. Graduate School - New Brunswick
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Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
RightsEvent
(ID = RE-2);
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Type
Embargo
DateTime
2010-10-31
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after October 31st, 2011.
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ETD
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application/pdf
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application/x-tar
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