Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2008. / A rapid measurement system is implemented using two digital video cameras,
presenting a faster and less expensive solution to certain metrology problems.
The cameras are calibrated from one stereo image-pair of a 3D calibration grid
that allows an immediate assessment of the achievable metric accuracy of the
system. Three different methods, using either laser tracking or structured light
patterns, were developed and employed to solve the coordinate extraction and
correspondence matching problems. Different image processing techniques were
used to speed up the entire measurement process. All software development was
accomplished using only freely distributed software packages.
The system achieves calibration in less than a minute and accumulates point
correspondences at 12 frames per second. Accuracies of greater than 0.4 mm are
achieved for a 235 x 190 x 95 mm measurement volume using a single pair of
images with 640 x 480 pixel resolution each.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1658 |
| Date | 03 1900 |
| Creators | Van der Merwe, Willem Johannes |
| Contributors | Schreve, K., University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
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