Rapid 3D measurement using digital video cameras
Date
2008-03
Authors
Van der Merwe, Willem Johannes
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : University of Stellenbosch
Abstract
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.
Description
Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2008.
Keywords
Stereo-vision, Metrology, Rapid, Digital video-cameras, Dissertations -- Mechatronic engineering, Theses -- Mechatronic engineering, Optical measurements, Digital video tape recorders -- Calibration