Hi Poojav,
I just wrote up a tutorial on using the stereo_vslam_node that you may find helpful:
http://www.ros.org/wiki/vslam_system/Tutorials/RunningVslamOnStereoData
If the node was receiving the images correctly, you should see callback printouts in the terminal where you ran roslaunch from. If you are not seeing these (or not seeing anything), most likely the subscription is not working correctly. I'm guessing that the problem is that the topics aren't synchronized: stereo_vslam_node expects all 4 topics (left/image_rect, right/image_rect, left/camera_info, right/camera_info) to be published synchronously; that is, all 4 topics should have identical timestamps.
If this is the case, and you're still having problems, it would be helpful if you could record a bag of your data.
Thanks,
Helen

On Wed, Aug 18, 2010 at 5:03 PM, poojav <poojavish@gmail.com> wrote:

Hey Rishi, a few colleagues and I are trying to get the demo working as well
with a Bumblebee camera and a SICK laser.  For now, we're just trying to
view the visual odometry results on the Willow Garage map as in the
test_bag.launch file, but it doesn't seem to be working.  We changed the
subscriptions in the stereo_vslam_node.cpp to match the location of our
publishing of the rectified images and camera info (looks like that's as far
as you got as well).  However, we don't seem to be getting anything.  I'm
still trying to figure out if we're publishing correctly, but I'm wondering
if there happened to be anything else you changed - if you got it all
working.  Thanks!
--
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