We spent a lot of time at first trying to find a good FFT library to use but finally settled on using ImageMagick because we could call it through the command line from our main program. We also used it for doing the threshold. Everything else was written in ObjC.
Edit: Ninja'd
English
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Who are you in the IRC?
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I'm not there today - was there yesterday as freefall722 though.
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Okay, was gonna say, saw someone posted a dropbox link and it turned out to be your picture but they said they weren't you lol