Ermes, Pierre
10mm. We checked the remaining tape measurements against the photogrammetrically obtained model dimensions and
the differences were all less than the estimated accuracy.
Figure 5. The reconstructed model.
7 CONCLUSIONS
We implemented a model-based photogrammetric system in combination with geometric constraints and a bundle
adjustment. The unique feature of this system is that measurements on the back-projected model edges are directly
related to the parameters of the CSG model and the parameters of the image orientation.
The integrated bundle adjustment overrides the need for a separate triangulation stage and no markers need be attached
to the installation. Instead, a one-step procedure, in which the installation is measured and the image orientations are
determined, is presented.
Geometric constraints between the primitives of a CSG model and geometric constraints between different CSG models
are included in the least-squares estimation of the parameters as weighted linearized observation equations.
The model-based photogrammetric system, including the geometric constraints and the bundle adjustment, is
successfully applied for the reconstruction of a complex industrial installation.
ACKNOWLEDGMENTS
We would like to thank the NAM for their cooperation during the pilot project.
This research is supported by the Dutch Technology Foundation (STW).
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