Structural deformation from stereo non-metric cameras and a bundle adjustment

John G. Fryer

doi:10.1117/12.2294297

1 August 1990 Structural deformation from stereo non-metric cameras and a bundle adjustment

John G. Fryer

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 13951I (1990) https://doi.org/10.1117/12.2294297
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

Abstract

Stereoscopic observations of 70 mm colour transparencies have been used in bundle adjustments to determine deformations of structural walls subjected to mine subsid- ence and the Newcastle, Australia, earthquake of magnitude 5.5 on the 28th December 1989. The photography was taken with a pair of Hasselblad 500 ELX cameras which had been modified by the addition of a glass reseau plate. The cameras were fixed 2 m apart on a bar, with camera-to-object distances varying from 10 m for the mine subsi- dence tasks to 30 m for some of the earthquake analyses. The stereoscopic observ- ations were made on an Adam Technology MPS-2 Analytical Stereoplotter with only the plate co-ordinates used in the bundle adjustment. Closures of under 4 micrometres on the frames were obtained from the bundle adjustments with an extremely low rejection rate of observations being a notable feature. The unusual combination of stereo- scopic observations, an analytical stereoplotter, non-metric cameras, bundle adjust- ments and a CAD program to provide timely results, is discussed.

Citation Download Citation

John G. Fryer "Structural deformation from stereo non-metric cameras and a bundle adjustment", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 13951I (1 August 1990); https://doi.org/10.1117/12.2294297

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