7 July 1997 Geometric and radiometric performance evaluation of the Leica/Helava DSW200 photogrammetric film scanner
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emmanuel P. Baltsavias, Silvio Haering, Thomas P. Kersten, "Geometric and radiometric performance evaluation of the Leica/Helava DSW200 photogrammetric film scanner", Proc. SPIE 3174, Videometrics V, (7 July 1997); doi: 10.1117/12.279777; https://doi.org/10.1117/12.279777
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