text: #!/usr/bin/env python
  # BEGIN ALL
  import rospy
  from sensor_msgs.msg import Image
  
  # BEGIN CALLBACK
  def image_callback(msg):
    pass
    # END CALLBACK
  
  rospy.init_node('follower')
  image_sub = rospy.Subscriber('camera/rgb/image_raw', Image, image_callback)
  rospy.spin()
  # END ALL
  