Task3/line_follower/launch/camera_offset_calibration.launch

<launch>
  <!-- Start usb_cam separately.  This launch file is subscriber-only. -->
  <arg name="config" default="$(find line_follower)/config/line_follow_debug.yaml"/>
  <arg name="image_topic" default="/usb_cam/image_raw"/>

  <node pkg="line_follower" type="camera_offset_calibrator.py" name="camera_offset_calibrator" output="screen">
    <rosparam command="load" file="$(arg config)"/>
    <param name="image_topic" value="$(arg image_topic)"/>
  </node>
</launch>