RE: Stereo Imaging in Science and Technology

[P3D Cliff Mugnier <cjmce@xxxxxxxxxxxxxxxx>]

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Dr. Themelis,

You asked:

Are these really hyperstereo applications or can they be called
"variable base", depending on the subject? =20


These are all variable base depending on the subject, but always greater =
than say, Realist stereo photography.


Also:

- Can you provide more details about the industrial dimensional
  control and optical tooling applications?

General Dynamics developed a system for their Electric Boat Division =
(nuclear submarine construction) for checking the "trueness of fit" =
using twin stereo CCD cameras over 5 years ago.  I think the system =
eventually got mothballed.

General Dynamics in Fort Worth, TX had another system provided by a =
private photogrammetric consulting firm for doing optical tooling =
applications for checking (and fixing/adjusting) jigs for a Fighter =
assembly plant.  I forget which model airplane, but it's a recent and I =
think, current model.

I do stuff for shipbuilding applications for checking fit-up, =
determining actual "as built" hull dimensions, developing digital X-Y-Z =
files of shapes of various complicated parts associated with shipyard =
activities.

- Same for BioStereometric.

I've done stuff for shooting U.S. Navy sailors out of jet fighter =
ejection seats.  That included stereo X-Rays, stereo head anthropometry =
and making contour maps of people's heads/faces, high-speed photography, =
stereo high-shutter freeze photography, etc.

- In forensic applications, is the base about equal to normal?

Almost always the base is exaggerated, occasionally I find "stereo of =
opportunity", really impresses juries when I project it in the court =
room.

  Does it even matter what the base is? =20

It does if you want to visually show it in the courtroom.  It is =
immaterial for analytical reconstruction.

Reconstruction will be=20
  possible once the base is known, but wider bases are preferred for=20
  more accurate measurements?

Analytical methods using multiple images will always yield the base as a =
computational by-product.  Wider bases are always preferred for =
analytical techniques, and stereo is immaterial.  Highly convergent =
(impossible for stereo) views are photogrammetrically preferable for =
high accuracy results.

- Architectural:  what is the objective of this?=20

Determination of "as built" dimensions for scaled drawings or AutoCAD =
files.  Archiving purposes are common and are invaluable for rebuilding =
after a catastrophe.  The Germans were able to "perfectly" rebuild a =
large number of buildings after WWII because they had stockpiled =
architectural photogrammetric images of many of their landmarks.  There =
have been a number of instruments specifically designed for doing =
architectural photogrammetry in similar fashion to topographic mapping =
from aerial photos, but using photos taken from the ground (or =
scaffolding).


Clifford J. Mugnier (cjmce@xxxxxxx)
The Topographic Engineering Laboratory
Department of Civil and Environmental Engineering
UNIVERSITY OF NEW ORLEANS
New Orleans, Louisiana  70148 -2212
Voice and Facsimile:   (504) 280-7095



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