ar_tag_alvar frame not found

asked 2014-09-10 05:33:15 -0500

Rahndall gravatar image

Dear ROS users, I'm using ar_tag_alvar, starting from example launch file already in the package. When launching, I get Frame id / does not exist!, despite I set <arg name="output_frame" default="ptu_pan_tilt_link"/> in the launch file. Thank you very much!

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when a tag is recognized, the node is not able to set the parent frame: /ar_marker_4_corrected exists with parent NO_PARENT.

Rahndall gravatar image Rahndall  ( 2014-09-10 05:39:39 -0500 )edit

Open up rqt and check the transform-tree, sounds like you have unconnected trees

Rabe gravatar image Rabe  ( 2014-09-10 07:13:51 -0500 )edit

the transform-tree seems correct. Furthermore, it seems a problem related to the camera: using another device connected to PC it works. Could it be a problem on camera setting? I'm using gscam to gather stream from a commercial webcam

Rahndall gravatar image Rahndall  ( 2014-09-10 08:07:36 -0500 )edit

the problem was on Image topic, where frame_id of header was not set. Thank you for your support!

Rahndall gravatar image Rahndall  ( 2014-09-15 04:59:38 -0500 )edit