VASC Seminar Announcement
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Date: Monday, 10/30/00
Time: 3:30-4:40
Place: NSH 3002

Speaker:  J. Michael Rollins, Hernandez Engineering, NASA-JSC Hybrid Vision Laboratory
Title: Photogrammetric Pose Estimation in Space Station Construction

Construction of the Space Station chiefly involves the docking of
prefabricated modules.  To this end, circular fiducial marks (spots) have
been placed at multiple positions about each module.  Knowledge of the spot
positions from spacecraft design in conjuction with images of the spots from
the flight cameras during docking provide a way to assess the relative pose
of the berthing and "stationary" modules while they are being connected.
Using flight imagery, spots must be detected and their centroids in image
coordinates must be estimated to sub-pixel accuracy.  Correlation provides a
means of assessing object positions to high accuracy.  Spot detection
methods and a sub-pixel accurate correlation method will be discussed and
sample results for actual flight images will be given.