A machine vision based non-contact measuring tool for mensuration in industry and manufacturing

This thesis report discusses the design, implementation and testing of a non-contact measuring tool based on the principle of stereo photogrammetry. The system uses a pair of CCD video cameras and a frame-grabber in a PC to capture the pair of images this requires. The software on the PC then measures the image co-ordinates of points selected by the user and transforms them into space co-ordinates for the points. The transformation requires knowledge of the relative positions and orientations of the cameras. This is found in a calibration stage from images of a calibration frame. The cameras are mounted on a bar, which guarantees that the relative positions and orientations of the cameras remain invariant within certain limits. This makes the system portable.

Grantor dc:publisher.institution

School of Architecture, Planning and Geomatics

Year dc:date.issued

1994

Author dc:creator

• Matthews, Mark Walter

Advisor dc:contributor.advisor

• Rüther, Heinz

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/11427/17012

OAI identifier oai:identifier

oai:open.uct.ac.za:11427/17012