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Proceedings of the Symposium on Progress in Data Processing and Analysis

fig 6
configuration for
video cameras
6. Data handling
The images taken by the stereo microscope, the Rolleiflex metric 6006 and 3003
and for checking purposes also displayed digital images from video cameras are
handled in the Planicomp and the DSR 11. The photo orientation by bundle
adjustment is computed by the Hannover program system BLUH in the case of more
than 2 images or by program BUNOR. The 2-photo-bundle orientation program
BUNOR is managing the whole process, including computation of approximate values,
error detection by data snooping and selfcalibration by additional parameters within
few seconds.
The standard programs for data aquisition can be used based on transformed photo
orientations. For sufficiant accuracy the systematic image errors, determined by
calibration and self calibration, must be respected by a correction grid, which will
give a correction to the position of the floating mark based on bilinear interpolation
(Picht 1987). This flexible possibility for correction of the photo geometry allows also
the handling of photos with large differences to perspective images.
The data aquisition with the digital plotter, developed by the Institute for
Photogrammetry of the University of Hannover (Lohmann et al 1989), includes the
advantage of optimal contrast enhancement and a more simple support by
A manual height measurement in a model taken with 6-fold enlargement by the
3003 and a base to height ratio of 1 : 2.6 has lead to an accuracy of the height
determination of metalic surfaces of +/- 3 pm in the object space, corresponding to
+/- 7 pm standard deviation in px. With automatic correlation based on the same
photos, digitized by an Optronics P1700, in the digital plotter an accuracy Sz =
+/- 5.8 pm was reached. Images of the stereo microscope only have enabled Sz =
+/- 13 pm.
The digital plotter has the advantage of a human interaction in the case of failed
correlation. A small percentage of missed points is not important if only
characteristic parameters of surfaces, like roughness, have to be determined. This
can be done close to on-line with video cameras attached to a PC. Such a system
is under development.