Hazards of reverse projection from hand-held cameras

James R. Williamson

doi:10.1117/12.157140

15 October 1993 Hazards of reverse projection from hand-held cameras

James R. Williamson

Proceedings Volume 1943, State-of-the-Art Mapping; (1993) https://doi.org/10.1117/12.157140
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

To individuals working with photogrammetric analysis (dimensional reconstruction) of close- range photogrammetry using hand-held or video cameras there are certain situation tasks confronting them with a dimensional reconstruction analysis from a reverse projection procedure. Close-range reverse projection is analogous to completing a resection procedure manually, i.e., either the original negative, or an enlarged positive is aligned (position and orientation) to locate the original camera station. The tasks could require verifying the accuracy of a reverse projection procedure application; or, the task could be as an expert witness in opposition to another expert using reverse projection. The method of reverse projection is for all practical purposes an uncontrolled close-range photogrammetric attempt at aerial rectification. This discussion quantitatively defines the errors associated with the close- range reverse projection through two examples. To compound the error propagation the photograph provided for analysis is usually a cropped enlargement, e.g., 3' X 5', 8' X 10', and so on.

Citation Download Citation

James R. Williamson "Hazards of reverse projection from hand-held cameras", Proc. SPIE 1943, State-of-the-Art Mapping, (15 October 1993); https://doi.org/10.1117/12.157140

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