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Atkinson: (Chairman of the Session)
Good afternoon, gentlemen. We will begin this afternoon's session which
deals with instrumentation with, of course, specific application to in-
dustrial photogrammetry. We come back to earth, with something of a bump
I think, after this morning's session.
The afternoon will be divided into two separate groups of papers. You
have seen from the program that the first group contains the papers of
Danko, Simonsson, Andrei and Cotovanu, and Würtz. These have something
in common in that they deal more particularly with cameras and develop-
rents or modifications to cameras, whereas in the second group, after the
coffee break, we have papers dealing with analytical plotters, and one
which is not noticed on the program, a short presentation from Dr. HOhle,
of a paper by Schlienger of Switzerland, in addition to papers from
Vigneron and Seeger.
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Paper by J. Danko - KELSH
"THE KELSH K-460 AND K-470 CAMERA SYSTEMS IN INDUSTRIAL PHOTOGRAMMETRY"
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Discussion of the above paper:
Atkinson: You mentioned the use of film. Have you any figures on the
degree of flatness which has been achieved with the Kelsh K-460 and K-470
cameras?
Danko: About Ÿ 3 microns.
Clerici: Since you are dealing with close range photogrammetry didn't
you consider developing a camera which would eventually be used for
restitution as well?
Danko: Many of you are already using Kelsh plotters in that manner. You
can place a photographic plate in the Kelsh plotter, take a photograph
with it, and restitute it at real world scale. There has been talk recent-
ly of a lot of old ideas coming into new uses. I have heard of this method
being considered in many manufacturing processes where, for example, a flat-
bed plotter could draw a pattern of some sort on a manuscript. The pattern
could then be made into a diapositive, and then projected through a lens
onto a curved surface, let us say for cutting out holes. With the proper
orientation, such a device could be used for tooling. But getting back to
your question, yes, but you are limited by the size of the object. I think
you are really limited to real world shapes when you plot. If you have a
camera with a different focal length, you can take photographs of objects
far off and plot them with a different focal length on the plotter.
Scott: Since you used a different lens in the plotter, from that of the
camera, how did you calibrate the camera at the extremely close focal setting?
Danko: Yes. We did not have the same lens in the plotter as in the camera.
We have a 90 mm lens in the camera.
Scott: My question is can you tell me something about calibrating the
camera, determining your principal distance when you set the close focus,
because you introduce a fairly large lens extension?
Danko: We used a step wedge in order to calibrate the Z, and we pick up
the direct Z-scale in the stereo model.
