Re-posted from: http://learningjulia.com/2017/03/09/imfilter-and-arrays.html
Whereas in my last post I manually wrote a blur kernel and code to convolve an image, I didn’t want to do that every time an image convolution came up. So in this post I learned about the imfilter
function from the ImageFiltering.jl package. I also learned about the @time
macro and had a small aside on array creation.