Senthil Kumaran thinks this is interesting: we use another matrix called a kernel From 2. Detecting Edges and Applying Image Filters from OpenCV with Python By Example by Prateek Joshi Publisher: Packt Publishing Released: September 2015 Note why is it called a kernel? Share this highlight http://www.safaribooksonline.com/a/opencv-with-python/12597642/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Learn about Safari for Business Have an account? Sign in. Minimise Unlock the rest of OpenCV with Python By Example and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.