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6
1978 ISP COMMISSION V INTER-CONGRESS SYMPOSIUM - STOCKHOLM SWEDEN
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Voss: This was done with a special test field. We had a lot of points,
one behind the other, and so we got a very good cage.
Scott: Then you did it photographically?
Voss: Yes, the reason being that you cannot get the distortion at the
near focus setting with a goniometer.
Danko: If you photograph an object with a fixed focus lens with monochro-
matic light at near depth of field, using panchromatic film, can you re-
project it through the same lens, with the same monochromatic light to the
far range of the depth of field with no distortion?
Voss: Because it is a fixed focus lens you cannot project to the far
distance at all, even with a very small stop opening.
Karara: I would like to bring to your attention an article by Duane Brown
on Close-Range Camera Calibration, published in the August 1971 issue of
Photogrammetric Engineering. This is a basic theoretical treatment and
includes a discussion of some of the points made in the paper of Dr. Würtz.
Grün: One part of the interior orientation is the distortion. There you
have very fine, very small values. Another part is the fiducial marks.
What is the accuracy of the fiducial marks in your system? What about the
stability of the distances or co-ordinates of these fiducial marks?
Voss: To begin with the second question, in the range of 5 microns for
each fiducial. That means a maximum sum of errors of 10 or 15 microns.
Grün: And what about the stability?
Voss: That depends on the user of the camera.
Miller: What measuring unit did Dr. Würtz use for the calibration work?
Is an accuracy of 15 microns sufficient for fiducial marks?
Voss: First, there is a difference between what they do in the workshop
for adjusting the cameras, and what Dr. Würtz did in his dissertation. He
did a bit more than they did. They calibrate with a goniometer using a
focal setting at infinity. What he investigated by photographing is the
effect of near focus. On the other hand what he used to measure the photo-
graphs was the Ascorecord of VEB Carl Zeiss JENA.
gg gegalgreo i d 689 99$ $$ 5S5 5S $5556 S
Paper by C. Vigneron - MATRA
"USE OF THE ANALYTICAL STEREOPLOTTER MATRA-TRASTER IN THE INDUSTRIAL FIELD"
* . . . . * * * . * . *. ® eo - e * * - * > - * . e * * * * * * - * e e. *. . *.
Paper by E. Seeger - ZEISS OBERKOCHEN
"THE USE OF THE ZEISS PLANICOMP C 100 ANALYTICAL SYSTEM IN THE NON-
TOPOGRAPHIC FIELD"
. . - + + . ^ . ® - - ^ ® - * > e - - LÀ *. * * - *. * * * * €. . e > e *. * . €
Discussion of the above papers
Grün: What software and what kind of programs are available in your TRASTER
system for close range applications?
Vigneron: At the moment we do not have any specific software for close
range photogrammetry. We use the same programs as for topographic appli-
cations. Several other mathematical solutions exist. We have not adapted
these for non-topographic applications.
