We are working on it. I will have to provide calibrated parameters of my camera to .launch file having usb_node. I was wondering how come it had opened my camera when i ran it for the first time and later not. -Prasad -- View this message in context: http://ros-users.122217.n3.nabble.com/ar-pose-basic-questions-tp2025177p2025201.html Sent from the ROS-Users mailing list archive at Nabble.com.