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Date: 21 Oct 88 14:55:25-PST
From: Vision-List moderator Phil Kahn <Vision-List-Request@ads.com>
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Vision-List Digest	Fri Oct 21 14:55:25 PDT 1988

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Today's Topics:

 FULCRUM 
 gathering dense image sequences

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Date: Friday, 21 October 1988 10:22:36 EDT
From: Dave.McKeown@maps.cs.cmu.edu
Subject: FULCRUM 
Status: RO

FULCRUM is an interactive map display system that uses a video
disk to store digitized maps at various resolutions.  There is
a graphic man-machine interface that allows a user to query the
display for lat/lon/elevation, a gazetteer, and the ability to
generate and place icons.  It is not so much automated mapping
(ie., cultural or terrain feature extraction from imagery, or
automated map name placement, or automated map digitization) 
as it is a way to interface the display of precompiled cartographic
information with a spatial database of geographic facts.
It is (was) developed by a company called Interactive Television
Company in Virgina, but I don't know any other particulars.
Cheers, Dave

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Date: Fri, 21 Oct 88 14:22:07 PDT
From: pkahn@meridian.ads.com (Phil Kahn)
Subject: gathering dense image sequences
Status: RO


I thought this might be of interest to those of you trying to acquire
controlled motion image sequences for testing or developing algorithms.

I am particularly interested in acquiring dense image sequences; that
is, imagery in which objects don't move more than about a single pixel
between frames (as described in Bolles, Baker, & Marimont IJCV, V1,
1987; Kahn, PAMI 7/85 and CVPR88 for a better description).

Smooth and controlled motion can be simply obtained by using a special
dolly and track available from most Motion Picture Equipment and
Supplies rental services (check the phone book). The movie industry
uses this to obtain smooth translation of the camera while
changing camera position.  Your tripod mounts on top of the dolly
(about 2' x 3') and fixed positions may be marked along the track
position in order to precisely control the position of the camera on
the ground plane. Tracks come in 4' and 8' sections.  It only cost $25
p/day for the dolly and $8 p/day for each 8' track section. For $50
p/day, we were able to acquire very smooth and precise motion.
Because of drift in robots, it is even more precise and controllable
than using a mobile robot vehicle to acquire test imagery.




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