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UBC Theses and Dissertations
UBC Theses and Dissertations
Near-real-time implementation of multiple light source optical flow Siegerist, Cristina Elena
Abstract
Multiple light source optical flow is a method to compute a dense, local representation of optical flow. The basic idea is to overcome the aperture problem using multiple images of a moving object acquired simultaneously under different conditions of illumination. Each image provides one linear constraint equation. When the optical flow and the 2D motion field coincide these equations are in the same unknowns. Two equations are enough to calculate both velocity componentss. Three or more images over-determine the system, allowing the calculation of confidence measures and making the computation more robust. This thesis presents a parallel, near-real-time implementation of multiple light source optical flow. Three light sources, one red, one green, and one blue, with negligible overlap in the visible spectrum illuminate the work place from different directions. Three separate black and white images corresponding to the three light sources are acquired simultaneously through a 3 CCD 24 bit RGB camera. The processing is done using a network of six independent processors. The encoded optical flow is displayed on a video monitor. For an image of size 240x240 pixels the processing rate is 4 frames/sec. The range of linear behaviour of the system was studied. A comparison with other methods on a synthetic and a real image sequence is presented.
Item Metadata
Title |
Near-real-time implementation of multiple light source optical flow
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1996
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Description |
Multiple light source optical flow is a method to compute a dense, local representation
of optical flow. The basic idea is to overcome the aperture problem using
multiple images of a moving object acquired simultaneously under different conditions
of illumination. Each image provides one linear constraint equation. When
the optical flow and the 2D motion field coincide these equations are in the same unknowns.
Two equations are enough to calculate both velocity componentss. Three
or more images over-determine the system, allowing the calculation of confidence
measures and making the computation more robust.
This thesis presents a parallel, near-real-time implementation of multiple
light source optical flow. Three light sources, one red, one green, and one blue, with
negligible overlap in the visible spectrum illuminate the work place from different
directions. Three separate black and white images corresponding to the three light
sources are acquired simultaneously through a 3 CCD 24 bit RGB camera. The
processing is done using a network of six independent processors. The encoded optical
flow is displayed on a video monitor. For an image of size 240x240 pixels the
processing rate is 4 frames/sec. The range of linear behaviour of the system was
studied. A comparison with other methods on a synthetic and a real image sequence
is presented.
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Extent |
7741364 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-10
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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 |
10.14288/1.0051375
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1996-05
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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.