Multiple exposures in non-metric camera applications

Systematic errors introduced through film deformation constitute a major factor limiting the photogrammetric accuracy of non-metric images. This paper examines the effectiveness of multiple exposure photography in reducing that component of the object-point positioning bias which is due to film unflatness. Aspects of network precision and accuracy are discussed, as are details concerning the additional parameter model selection and the use of orientation constraints. A non-metric camera experiment, in which multiple exposures were employed, is outlined and the results of this practical application are presented.