https://inst.eecs.berkeley.edu/~cs194-26/fa18/Lectures/LaplacianPyramids.pdf slide 7 in this lecture shows how sharpening is achieved with a nice example.
https://inst.eecs.berkeley.edu/~cs194-26/fa18/Lectures/LaplacianPyramids.pdf slide 7 in this lecture shows how sharpening is achieved with a nice example.