efernandez
commented
7 years ago @rcpilotp51 The homography example is here: https://github.com/rosbook/effective_robotics_programming_with_ros/tree/master/chapter9_tutorials/src
Please note that chapter 9 is the one that covers computer vision in this new book: https://www.packtpub.com/hardware-and-creative/effective-robotics-programming-ros-third-edition
It looks you're using the previous book.
The tutorial files outlined in the chapter do not exist. Specifically the Homography examples.