johnw@pegasus.com (John Williams) (12/29/90)
Seafloor Surveys International, Inc. is looking for a computer system
which will allow us to interactively manipulate our sonar imagery.
Our final images of the ocean floor are of the order of
16K by 16K pixels. These images are constructed by
interactively placing a dozen or more "sub-images"
into the final image grid. The sub-images are about 1M
pixels each. The sub-images have irregular shapes.
In some places, there are gaps between the sub-images.
In some places, the sub-images overlap. In these overlap areas, both
sub-images must be preserved so that the operator can alternately
view each (as with overlapped windows).
The operator will use one or more high resolution color monitors
as windows into the final grid. The operator should be able to
roam around the image and zoom in and out at will.
Within the final grid, sub-images are coarsely positioned using
available navigation data. The fine positioning is performed by
a human operator identifying "control points" which must be aligned
in two overlapping sub-images. One sub-image is "warped" to align
its control points with the other. The warping process must also
calculate corrections to the original navigation so that the
sub-image may be correctly positioned in the future.
The complete processing of a final grid must proceed quickly enough
that the operator can complete several in a single working day.
As part of the evaluation of proposed systems, I will want to run
a benchmark test similar to the processing described above.
For the sake of brevity, only small part of a larger processing
scheme has been described. I have described those functions I feel
will be the most difficult to implememt in a cost-effective way.
A high resolution output device is required which can be
used to make copies of the final image. The copies must
have at least 8 dots per millimeter (200 dots per inch),
where each dot may be one of at least 16 shades of grey.
We may have a requirement for a similar color device in the future.
Both paper and transparent media are required, and all media must meet
stability criteria. The output device must employ a technology
which avoids reproducibility problems when different types of media
are used and as the output device ages.
The output device must be able to produce copies which are any of
ISO sizes A0 through A4 or ANSI sizes A through E.
Note: large format photographic film recorders will be considered
if the final copies conform to our output specifications.
If you are interested, please contact John Williams, address below.
johnw@ssi-h.pegasus.com John Williams
Seafloor Surveys International, Inc.
Phone: (808) 537-9561 1221 Kapiolani Blvd., Ph-40
Fax: (808) 523-5958 Honolulu, Hi. 96814johnw@pegasus.com (John Williams) (12/30/90)
> Seafloor Surveys International, Inc. is looking for a computer system > which will allow us to interactively manipulate our sonar imagery. ... We've been developing a system which matches SSI's requirements and are currently discussing potential work with them. We're very interested in who else might be in the market for such a system AND who else is developing a similar image composition package. The key features of our system include: -- interactive image mosaicking with tie-point warping under X windows -- high speed processing using a Vitec-50 but fully portable to a Sun stand-alone -- i/o with video, scanning, and printing devices under one GUI -- /\/\ /\/\ Marty Marra, Woods Hole Oceanographic Institution, Blake Rm 109 / \ / \ Woods Hole, MA 02543 "marra@jargon.whoi.edu" (508)457-2000x3234