期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1998
卷号：XXXII Part 1
页码：67-74
出版社：Copernicus Publications
摘要：In the summer of 1996 the Swiss Federal Office of Topography (L+ T) performed in cooperation with ETH benchmark tests at differentcompanies in order to evaluate three photogrammetric film scanners. After the tests a Zeiss SCAI scanner was acquired, installed, andtested in spring 1997 as to whether it fulfils the contract specifications. In this paper the results of these two tests performed with theSCAI, and in particular geometric and radiometric investigations, are presented. Good quality test patterns and accurate processingmethods for their perf9rmance evaluation have been employed. The geometric tests include geometric errors, misregistration betweencolour channels, geometric repeatability, and determination of the geometric resolution. The radiometric tests include investigations onnoise, linearity, dynamic range, spectral variation of noise, and artifacts. After a brief description of the scanner, details on the aboveinvestigations, analysis methods and results are presented. Regarding the geometric accuracy the RMS was 2.0-2.3 J..Lm and the meanmaximum absolute error 6.0-8.1 J..Lm. The errors are bounded, i.e. the maximum absolute error is 2.7-3.6 RMS. Systematic coregistrationerrors in scan direction between the colour channels of up to ca. 2.5 J..Lm have been observed. The short term repeatability. was very high. The radiometric noise level is 1-1.6 and 0.9-1.3 grey values for 7 and 14 J..Lm scan pixel size respectively. The dynamicrange is 1.6-1. 9D and 1.75-2.05D for 7 and 14 J..Lm respectively with a good linear response up to this value. Quite a lot of artifacts andelectronic noise up to 5 grey values were observed. There were no significant differences between R, G, B channels with respect togeometry but their radiometric behaviour was quite different. The software is generally positive but improvements regarding automaticdensity determination, geometric and radiometric calibration, and user freedom in scan parameter choice are needed
关键词：Roll Film Scanner; Film Digitisation; Scanner Quality Analysis; Scanner Test Patterns; Scanner Calibration
