I hope that you have followed all instructions properly; here is the command to launch all the nodes for this project and start tracking using Dynamixel:

    $ roslaunch face_tracker_pkg start_dynamixel_tracking.launch

You will get the following windows, and it would be good if you could use a photo to test the tracking, because you will get continuous tracking of the face:

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Here, you can see the Terminal message that says the image is in the right and the controller is reducing the position value to achieve the center position.