Visit my blog for project details. http://www.yisystems.com/blogs/item/319-a-line-following-rover-project-use-opencv-in-ros-nodes

Build codes:

1. You need to install ROS (jade version) first.
2. You need to install OpenCV.
3. You need to install wiringPi.
4. This project folder is a full catkn workspace (not just a package.) You can get this respository, then
   type
   cd ~/roscar
   then type
   catkin_make
   
5. In case you just need the ROS package, it is under "roscar/src/wheels" folder.

mail me yisystemsinc@gmail.com if you have any questions.