Abstract

CAMMIDGE, M.  and  RIITHER, H.. From image to CAD. A digital photogrammetry system for the semi-automatic mapping of plants and pipe-systems. R&D j. (Matieland, Online) [online]. 1997, vol.13, pp.41-46. ISSN 2309-8988.

A machine vision (digital photogrammetry) system for the semi-automated identification of objects in industrial environments, and especially the determination of pipe dimensions and orientations is described. The test measurements on objects covering some 80% of the image resulted in accuracies of 1 in 2 000 (difference between known and system determined object dimensions) and precisions of better than 1 in 2000 (standard deviation against object dimension). The test also confirmed the svstem's ability to determine circle parameters based on the photogram-metric measurement of three points on a cylindrical body, a feature especially designed for the measurement of pipes.

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