Type of Document Master's Thesis Author Fanto, Peter Louis URN etd-07252012-081926 Title Automatic Positioning and Design of a Variable Baseline Stereo Boom Degree Master of Science Department Mechanical Engineering Advisory Committee
Advisor Name Title Kochersberger, Kevin Bruce Committee Chair Abbott, A. Lynn Committee Member Golparvar-Fard, Mani Committee Member Roach, John W. Committee Member Keywords
- Unmanned Systems
- Variable Baseline
- Stereo boom
- Automatic Positioning
Date of Defense 2012-07-17 Availability unrestricted AbstractConventional stereo vision systems rely on two spatially fixed cameras to gather depth
information about a scene. The cameras typically have a fixed distance between them,
known as the baseline. As the baseline increases, the estimated 3D information becomes
more accurate, which makes it advantageous to have as large a baseline as possible. However,
large baselines have problems whenever objects approach the cameras. The objects begin
to leave the field of view of the cameras, making it impossible to determine where they are
located in 3D space. This becomes especially important if an object of interest must be
actuated upon and is approached by a vehicle.
In an attempt to overcome this limitation, this thesis introduces a variable baseline
stereo system that can adjust its baseline automatically based on the location of an object
of interest. This allows accurate depth information to be gathered when an object is both
near and far. The system was designed to operate under, and automatically move to a large
range of different baselines.
This thesis presents the mechanical design of the stereo boom. This is followed by a
derivation of a control scheme that adjusts the baseline based on an estimate object location,
which is gathered from stereo vision. This algorithm ensures that a certain incident angle on
an object of interest is never surpassed. This maximum angle is determined by where a stereo
correspondence algorithm, Semi-Global Block Matching, fails to create full reconstructions.
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