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Curated by: Huygens Optics (81 videos)
Optical Fourier transformations were performed using small lithographic patterns of different characters. A DLP projector can be used as a Fourier filter to do simple pattern recognition. Video contents: 0:00 General introduction 1:44 Fourier explained (simple) 3:45 Digging a bit deeper (sorry, could not resist) 5:55 Fourier on images 9:27 Fourier transforms using optics 12:05 Setup and results 14:15 Fourier filtering The 2D Fourier transformation images were calculated using freeware developed by Kobe University. You dan download this tool from: http://cas.eedept.kobe-u.ac.jp/WelcomeES1/OpenSoft/FFT2D/index_en.html Conversions of 2D images to 3D were done using Gwyddion. This very advanced piece of software is can be downloaded for free from: http://gwyddion.net/download.php To illustrate 2D Fourier transform on an actual image, a small part of an M.C. Escher drawing was used. While editing the material for this video I found out that the Applied Science channel made a somewhat similar video on "Optical Fourier" already in 2012: https://www.youtube.com/watch?v=wcRB3TWIAXE . Luckily the angle is somewhat different. This video gives a different (and deeper) perspective on the math behind Fourier transformations; https://www.youtube.com/watch?v=7mkn47hqqkc If you want to go all the way, read the wiki page on Fourier. If you dare. https://en.wikipedia.org/wiki/Fourier_transform