On the Use of Nonmetric Cameras in Analytical Close-Range Photogrammetry

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Abstract
Analytical data reduction techniques have facilitated the use of nonmetric, amateur cameras in applications of precision photogrammetry. This paper discusses the analytical restitution of close-range nonmetric imagery. Initially, aspects of the mathematical formulations of both the self-calibrating bundle adjustment and sequential DLT-type methods are reviewed and statistical considerations are outlined. A self-calibration approach using mixed block- and photo-invariant additional parameters is proposed, and an experiment conducted to test the accuracy and precision of this technique is detailed. The experiment involved the multistation phototriangulation of nonmetric Hasselblad 500 ELM images, using both self-calibration and a DLT-type method. Relative accuracies in the object space were found to be of the order of 1:10 000 and higher for the former approach and 1:6000 for the latter. Further results of this experiment, which lend weight to the contention that nonmetric cameras are capable of producing results of high accuracy, are discussed and general conclusions are drawn.

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