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Proceedings Paper

Problems of precise target location and camera orientation in digital close-range photogrammetry
Author(s): Josef Jansa; Yong Ru Huang; John Charles Trinder
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Paper Abstract

A close-range application for medical purposes uses video CCD cameras and a control field of small balls for camera calibration and orientation. The spherical shape enables robust detection as the image of ball must always be very similar to a circle. Partly occluded or shadowed control points can be detected and rejected. On the other hand this shape is sensitive to illumination effect which influences the point location procedures. Erroneously located points might not be detected during orientation, thus causing distortions of the restituted 3D object. This article investigates the effect which can occur and checks the robustness of various point locating methods by using simulated examples. Edge extraction and feature matching can deliver good results. Finally one method based on Forstner operator is presented.

Paper Details

Date Published: 22 October 1993
PDF: 11 pages
Proc. SPIE 2067, Videometrics II, (22 October 1993); doi: 10.1117/12.162122
Show Author Affiliations
Josef Jansa, Univ. of Technology (Austria)
Yong Ru Huang, Univ. of New South Wales (Australia)
John Charles Trinder, Univ. of New South Wales (Australia)

Published in SPIE Proceedings Vol. 2067:
Videometrics II
Sabry F. El-Hakim, Editor(s)

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