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Proceedings Paper

Geometric and radiometric performance evaluation of the Leica/Helava DSW200 photogrammetric film scanner
Author(s): Emmanuel P. Baltsavias; Silvio Haering; Thomas P. Kersten
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Paper Abstract

In this paper geometric and radiometric investigations performed with two Leica/Helava DSW200 scanners will be presented. Good quality test patterns and accurate processing methods for their performance evaluation have been employed. The geometric tests include global and local geometric errors, misregistration between color channels, geometric repeatability, and determination of the geometric resolution. Efforts were made to separate the contribution of various error sources (especially mechanical positioning, electronic errors and lens distortion) on the total error. The radiometric tests include investigation on noise, linearity, dynamic range, spatial, temporal and spectral variation of noise, and artifacts. After a brief description of the scanner, details on the above investigation, used analysis methods and achieved results will be presented. The most important errors, especially for organizations employing the scanner in production, are nonrepeatable geometric errors that are due to mechanical positioning inaccuracies and vibrations. This causes whole CCD image tiles (4 million pixels) to be systematically shifted with respect to their neighboring tiles, with obvious negative influence on any subsequent measuring task.

Paper Details

Date Published: 7 July 1997
PDF: 17 pages
Proc. SPIE 3174, Videometrics V, (7 July 1997); doi: 10.1117/12.279777
Show Author Affiliations
Emmanuel P. Baltsavias, Swiss Federal Institute of Technology (Switzerland)
Silvio Haering, Swissphoto Vermessung AG (Switzerland)
Thomas P. Kersten, Swissphoto Vermessung AG (Switzerland)


Published in SPIE Proceedings Vol. 3174:
Videometrics V
Sabry F. El-Hakim, Editor(s)

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