Re: Software stereo-restitution.

[Virtual North <vnorth@xxxxxxxxxxxxx>]

>Date: Wed, 15 Nov 1995 14:58:12 -0500 (EST)
>From: Josh Rubin <jnr@xxxxxxxxx>

>>   
>>   >My question is : Does exist a shareware software that can compute from
>>   >the left and right pictures  the stereo-restitution (In french what we
>>   >call the "modele numerique de terrain", or the "ortho-image").
>>   
>>   I'm afraid I haven't heard of anything like that in shareware; in fact, the
>>   only programs I know of to do this sort of thing are highly experimental (&
>>   not too accurate).  There probably are programs out there that
>>   cartographers & photogrammetrists use, & I'm pretty sure there are people
>>   on the list who know more about that than I do (anyone?).  I'd guess that
>>   any such programs would require help from the operator in locating
>>   corresponding points in the two images, that being the hardest part of the
>>   problem from a computational point of view.
>>

I did run across some sharewhare some time ago advertised in the magazine
called Advanced Imaging. I called them and ask for a copy, but it never
showed up. Unfortunately, I didn't follow up on this and don't have the
name. I suspect that it would not have had the required accuracy. For those
who are interested Advanced Imaging, an excellent product, it is distributed
free-of-charge to "qualified" professionals. Contact them at 455 Broad
Hollow Road, Melville, N.Y. USA 11747. There are many interesting features
like industry updates. For exmaple, Oct's p.8 announcement of a
"glasses-free" true stereo display for 3-D video called the High Definition
Volumetric Display (HDVD) by Dimensional Media Associates (DMA: New York
City). The note says that the technology evolved from off-axis, segmeented
optical array volumetric imaging displays (by the same co.) in the 80's.

>I've heard of a non-shareware program for the PC that does this.  I
>actually saw it in Atlanta.  The operator designates the homologous
>points and the program generates a mesh.  I'd like something like
>it for the Mac.  I forget the product and company name, but
>they also make a program that can take a pair and make an anaglyph.>

As far as commercial software goes try PCI EASI/PACE airphoto orthographic
and DEM package and their Image-Mapping and OrthoEngine packages. ( see
http://www.pci.on.ca/ , email: sales@xxxxxxxxx, phone 905-764-9604 (to check
for a office nearer to you), fax: 905-764-9604). I have made elevation
models from stereo pairs using their software and it worked quite well. You
do need to build camera models from details like ground control, principle
points, focal length, viewing position, view orientation, etc..

Last winter PCI acquired/purchased Horler Hi-View a very sophisticated
package to produce DEM's. They are also selling and supporting this package
and I understand are incorporating the algorithm's into their next releases.

Their software runs on Unix, Windows (3.1, '95, NT), and Mac platforms.

GREAT product.

>Josh

   
>Joshua N. Rubin (jnr@xxxxxxxxx) 

Dan Good
Virtual North: Adventures in Canada
http://canadiana.com/vnorth/  


------------------------------