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Copy the beginner_tutorials folder in your catkin workspace at src directory.
(ex:- ~/catkin_ws/src/) -
Go back to catkin_ws directory.
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Do
catkin_make -
Source the path in environment.
(ex:- source ~/catkin_ws/devel/setup.sh) -
Launch the roslaunch file
roslaunch beginner_tutorials turtlemimic.launch
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Two new camera window will open and you can look that it recognises blue colour.(color)
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Use rqt_graph to better understad the nodes and topics.