computer has an internal camera (as many laptops do), it will likely be on
/dev/video0 while an externally attached USB camera will probably be on
/dev/video1 .
errors:
1、
~/catkin_ws$ roslaunch rbx1_vision usb_cam.launch video_device:=/v/video0
rbx1的功能包需要在catkin_ws工作空间下，进行工作。而不能在新开的终端下工作。
最后解决了问题。成功开启摄像头。
$ rosrun image_view image_view image:=/camera/rgb/image_raw
NOTE: By default, the usb_cam node publishes the image on the topic
/usb_cam/image_raw . Our launch file usb_cam.launch remaps the topic to
/camera/rgb/image_raw which is the topic used by the openni and freenect launch
files for depth cameras. This way we can use the same code below for either type of
camera.