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So there's this effect in Adobe After Effects that I love and I really want to try and write a code to achieve something similar.. The effect is called Vector Blur but I can't seem to find any leads online to help me get going. I think the effect is somehow blurring perpendicular to edges in an image (see samples below) but I'm not exactly sure how it is calculating the directions/angles of the blur.
Base ref Image http://imgur.com/iLhNLKh
Effect applied at 25 (dunno what unit that is) http://imgur.com/ftuNY7J
Effect applied at 50 http://imgur.com/CCFyCaC
As you can see it's based on the brightness somehow but I'm not exactly sure how. Or perhaps it's actually a common effect that has a different name. Cos Vector Blur is a bit misleading and googling it often brings up motion blur stuff. I just need a few leads/keywords to search and dig thru, I'm happy to work it out myself, even if there's code in a different language. that's part of the fun! :) Any help would be appreciated.