1978 ISP COMMISSION V INTER-CONGRESS SYMPOSIUM - STOCKHOLM SWEDEN
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Karara: (Chairman of the Session)
Good morning ladies and gentlemen. Welcome to the session on "Analytics
in Industrial Photogrammetry". We have, this morning, six papers sche-
duled and there should be ample time for discussion.
One of the major trends in the development of non-topographic photogram-
metry, in recent years, has been an increase in the use of analytical data
reduction methods. With little or no modification, many of the computa-
tional methods which were developed over the years, for aerial mapping and
aerial triangulation, can be applied in non-topographic projects.
Through the use of advanced data reduction techniques, the use of non-
metric cameras for data acquisition in close range and micro range photo-
grammetry has become possible, thus freeing photogrammetric systems from
unnecessary restrictions which were thought to be vitally important in
the traditional way of thinking. As fully expected, the acceptance of
non-metric cameras as photogrammetric data acquisition systems has been
opposed by many, by some very fiercely. But I firmly believe that it is
only a matter of time until the photogrammetric potential of these ad-
ditional tools is universally recognized.
A number of analytical data reduction approaches, particularly suitable
for non-metric photogrammetry, have evolved, including the Direct Linear
Transformation (DLT) method. The DLT is basically an interpolation method.
From the basic relations of the DLT, Messrs. Bopp and Krauss of the Univer-
sity of Stuttgart, derived an exact solution, a rigorous solution for the
orientation and calibration of the cameras. In contrast to the DLT approach,
the Bopp-Rrauss solution lends itself beautifully to accurate prediction of
accuracy. In their publications so far, Bopp and Krauss had not considered
the influence of lens distortion. This morning they expand their solution
to include this influence.
Our first speaker this morning is Mr. Bopp.
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Paper by H. Bopp and H. Krauss - University of Stuttgart
"EXTENSION OF THE ELEVEN PARAMETER SOLUTION FOR ON-THE-JOB CALIBRATIONS OF
NON-METRIC CAMERAS"
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Paper by M. Altan, H. Bopp, and H. Krauss - University of Stuttgart
(This paper was presented by Mr. Krauss.)
"SOME ACCURACY ASPECTS OF ON-THE-JOB CALIBRATIONS SHOWN AT THE EXAMPLE OF
A PHOTOGRAMMETRIC CONTROL SURVEY"
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Discussion of the Above Papers
Karara: By way of opening the session I have two or three points to make.
The first one is that the correlation among the eleven parameters in the
eleven-parameter solution must be insignificant, because in the DLT solution
the eleven parameters are considered independent, yet the results of very
many controlled experiments made, have not indicated that we were neglecting .
something of significance. The second point is that I have listened atten-
tively to the papers just given, also read your paper in (B&L), and your
paper coming up soon in Photogrammetric Engineering, but nowhere do I see
any indication of what level of correlation there is among the eleven para-
meters. And I also see in the Altan-Bopp-Krauss paper there is a statement
