Subject
- Posted on
webcams suitable for stereo vision
- 05-18-2007
May 18, 2007, 2:24 pm
I want to buy 2 webcams for a stereo vision project. I like the look
of the Creative Live Ultra camera because it has a wide field of view
(~76 degrees) and a high framerate over USB2 (30fps at 640x420
pixels).
Here is the rub: I do not know if 2 cameras will work simultaneously
under Windows. There are reports of problems doing this. Some
cameras appear to work and some do not, although it may be that some
people have simply solved the problem and some have not. Creative
cameras have a terrible reputation according to their reviews on
Amazon and most of the problems are driver related, so I already feel
wary. Typically their support service does not even deign to answer
enquiries of this nature.
There are 2 issues.
- It would appear to be impossible to use 2 webcams simultaneously
using the deprecated VFW interface.
- The newer ActiveShow interface does make simultaneous use of 2
cameras possible, but it MAY depend on the cameras drivers as well.
Unfortunately the ActiveShow interface is so insanely convoluted that
failure to make something work rarely proves it is impossible - there
are so many alternatives.
Has anybody successfully used 2 Creative Live Ultra cameras
simultaneosly under windows ?
Alternatively can you recommend another suitable camera which
definitely works.
regards,
Pablo
of the Creative Live Ultra camera because it has a wide field of view
(~76 degrees) and a high framerate over USB2 (30fps at 640x420
pixels).
Here is the rub: I do not know if 2 cameras will work simultaneously
under Windows. There are reports of problems doing this. Some
cameras appear to work and some do not, although it may be that some
people have simply solved the problem and some have not. Creative
cameras have a terrible reputation according to their reviews on
Amazon and most of the problems are driver related, so I already feel
wary. Typically their support service does not even deign to answer
enquiries of this nature.
There are 2 issues.
- It would appear to be impossible to use 2 webcams simultaneously
using the deprecated VFW interface.
- The newer ActiveShow interface does make simultaneous use of 2
cameras possible, but it MAY depend on the cameras drivers as well.
Unfortunately the ActiveShow interface is so insanely convoluted that
failure to make something work rarely proves it is impossible - there
are so many alternatives.
Has anybody successfully used 2 Creative Live Ultra cameras
simultaneosly under windows ?
Alternatively can you recommend another suitable camera which
definitely works.
regards,
Pablo
Re: webcams suitable for stereo vision
It's possible to get a pair of UniBrain FireWire cameras working
simultaneously under Windows. Haven't tried it with USB devices.
I implemented support for FireWire cameras in QNX, and saw that
the Linux FireWire camera support was a mess, but that was a few years back.
Check out the OpenCV vision library on SourceForge. It finally reached
version 1.0 late last year. There's a stereo vision system in there.
I tried it once, but the scheme for aligning the cameras in software never
really worked right. If you can align the cameras mechanically, it
might work better.
John Nagle
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