| Type of Document |
Dissertation |
| Author |
Kim, Taegeun
|
| Author's Email Address |
takim@ee.vt.edu |
| URN |
etd-07232000-09480053 |
| Title |
Optical Three-Dimensional Image Matching
using Holographic Information |
| Degree |
PhD |
| Department |
Electrical and Computer Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Poon, Ting-Chung |
Committee Chair |
| Abbott, A. Lynn |
Committee Member |
| Besieris, Ioannis M. |
Committee Member |
| Ferrari, Leonard A. |
Committee Member |
| Indebetouw, Guy J. |
Committee Member |
|
| Keywords |
- Optical Scanning Holography
- Holographic correlation
- Phase-only holographic information
- 3-D image recognition
|
| Date of Defense |
2000-07-19 |
| Availability |
unrestricted |
Abstract
We present a three-dimensional (3-D) optical image matching technique and location extraction techniques of matched 3-D objects for optical pattern recognition. We first describe the 3-D matching technique based on two-pupil optical heterodyne scanning. A hologram of the 3-D reference object is first created and then represented as one pupil function with the other pupil function being a delta function. The superposition of each beam modulated by the two pupils generates a scanning beam pattern. This beam pattern scans the 3-D target object to be recognized. The output of the scanning system gives out the 2-D correlation of the hologram of the reference object and that of the target object. When the 3-D image of the target object is matched with that of the reference object, the output of the system generates a strong correlation peak. This theory of 3-D holographic matching is analyzed in terms of two-pupil optical scanning. Computer simulation and optical experiment results are presented to reinforce the developed theory.
The second part of the research concerns the extraction of the location of a 3-D image matched object. The proposed system basically performs a correlation of the hologram of a 3-D reference object and that of a 3-D target object, and hence 3-D matching is possible. However, the system does not give out the depth location of matched 3-D target objects directly because the correlation of holograms is a 2-D correlation and hence not 3-D shift invariant. We propose two methods to extract the location of matched 3-D objects directly from the correlation output of the system. One method is to use the optical system that focuses the output correlation pattern along depth and arrives at the 3-D location at the focused location. However, this technique has a drawback in that only the location of 3-D targets that are farther away from the 3-D reference object can be extracted. Thus, in this research, we propose another method in which the extraction of a location for a matched 3-D object is possible without the aforementioned drawback. This method applies the Wigner distribution to the power fringe-adjusted filtered correlation output to extract the 3-D location of a matched object. We analyze the proposed method and present computer simulation and optical experiment results.
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| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
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56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
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Dis_edt.pdf |
11.16 Mb |
00:51:40 |
00:26:34 |
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