This Package is an implementation of canny edge detector
To use this package we need image data for which we need to run cv_camera package to get the raw image. to run the cv_camera package use the following command
rosrun cv_camera cv_camera_node
from the cv_camera package we get raw images from the following topic
/cv_camera/image_raw
which this package subscribe and process with canny edge detection to produce output image under topic
/canny_edge/canny_image
canny_edge.cpp
canny_edge.launch