| Re: 3-D-representation of heights [message #9241 is a reply to message #9108] |
Wed, 04 June 1997 00:00  |
Robert Smith
Messages: 1
Registered: June 1997
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Junior Member |
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Achim Hein wrote:
>
> Hi,
>
> I am looking for information or software to represent two images, one
> contains the amplitude information and the other 2-d-array contains the
Achim:
The red-green technique you refer to is called anaglyph, and is
the cheapest (tho not the best) way of making 3-d images. I'm not aware
of any "canned" programs for generating stereo pairs from the kind of
images you describe, but typically the program to convert any sort of
3-d coordinate representation to stereo is less than a page of code.
Try drawing the situation (seen from the top) with the 2 eyes observing
different views of an arbitrary point hovering above a background (X,Z
only, Y is invariant in stereo pairs). The trigonometry for determining
where to put that point on the two images is straightforward. There are
2 tricks: start by placing the points in order of farthest away first,
that way the nearer points which occlude farther points will write over
them and you basically don't have to do any occlusion calculations; 2nd
when you're done, scan the images for any missing points (whenever 2
points on the original image wind up in the same pixel in one of the
final images, then there will be an empty pixel somewhare else. Fill
these by interpolating in the X direction.
That's basically it. I've written this algorithm numerous times
for various applications, and it's not hard. If you get stuck, e-mail
me.
Incidentally, if this is for a high-end application, you might
consider using lcd shutter glasses in place of anaglyph. These
basically allow each eye to see only alternate frames of a video
display, so you can put right- and left-eye images in alternate frames.
The advantage is full color images; the disadvantage is spending
several hundred dollars per viewer.
Good luck
Bob
. Robert A. Smith, Ph.D.
_____ . Vision Systems' Analyst
| |<. Current Technology, Inc.
|_____| . (603) 868-2270
^ . mailto:ras@curtech.com
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