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Hi.

First of all, your problem is an OpenCV problem so I would think you might have better luck asking in the OpenCV group: http://tech.groups.yahoo.com/group/OpenCV/

Secondly, as pointed out here (http://stackoverflow.com/questions/10194033/opencv-with-2-cameras-vc) OpenCV does not seem to handle >1 USB cameras on Windows all that well in general.

One suggestion would be to try something different. For example, you could try to actually use ROS to communicate with the cameras and set them up as ROS topics. Then create a node that subscribes to the images and does whatever OpenCV processing you need to do. There's no guarantee this would work, but it's worth the shot I'd think.

Kind regards, Stefan Freyr.