Several articles recently have mentioned offset photo's and matching points.
In the early 90's several aerospace companies used a system for
photogramatry. This system had a special large format camera with high
contrast film, ring flashes and reflective glass micro-spheres. An
automated reader located the center of the back reflection from each sphere
on the films and a computer program converted this data to 3D coordinates.
On objects about 12 feet across I saw data with accuracies of better than
0.005".
David Maxfield
Incre, LLC
This archive was generated by hypermail 2.1.2 : Tue Jun 05 2001 - 22:39:55 EEST