Revision history [back]

Sorry for the delayed response,

In addition to what BennyRe rightly said, I suggest you check your camera frame id with

rostopic echo /camera/camera_info    .

In this case, publishing with respect to the camera frame is a good idea, since ar_track_alvar returns marker coordinates. (It is similar to the ar_single and ar_multiple components of the ar_pose package. )

I had set my output_frame as v4l_frame using:

<param name="frame_id" value="/v4l_frame" />

in the corresponding launch file.

In case you do not have frame id being set (or your driver lacks camera_info as mine did), try including that in your driver (be it gscam / usb_cam / uvc_camera ).

In case your camera frame is not publish