Hi Ken,

Many thanks for the update--I now see the height and width in the 
/camera_info message.  I am not using calibration at the moment, but I 
wanted a way to have width and height on /camera_info automatically from 
the params in the launch file so I could read it from other nodes.

But there is still something I don't understand about uvc_camera so 
sorry about having to ask such a basic question.  If I set the image 
width and height in my launch file to different values, e.g. 160x120 
versus 640x480, I don't see any difference in the resolution of 
/image_raw when viewed in image_view.  By contrast, if I use the usb_cam 
node from the bosch-ros-stack (http://www.ros.org/wiki/bosch-ros-pkg), 
then I do see the change in resolution.  Similarly, I don't see a change 
in fps in uvc_camera if I change its value in the launch file.  (usb_cam 
does not appear to be able change fps so I can't compare.)

Should I be able to set these parameters in uvc_camera and see the 
effects in image_view?

Thanks!

--patrick