An interesting demo popped up on hacker news today about fourier image filtering: Fourier Image Filtering
Has anyone here ever implemented something like this as a shader? If you have, how did it perform? I have a bunch of techniques I use to do edge detection, sharpening and blurring. I’m wondering if a single fourier shader would be more appropriate.
Here’s some further reading: Fast Fourier Transform
It seems like it’s probably faster for what I’m doing and in general quite useful. I’m going to have a go at it and report back!
If you are looking for more reading on the subject I’ve found this book to be quite helpful. I’ve not used FFT’s for much image processing (other than those implemented already in many software packages) but i’m guessing chapters 23-25 along with some of the initial chapters on transform may be helpful.