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Fourier Optics used for Optical Pattern Recognition

Huygens Optics · 102.9K views · 2020-07-25 · 18:31

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Overview

Huygens Optics explains the Fourier transform and shows how a lens performs one optically. A DLP projector is used as a Fourier filter to do simple pattern recognition on lithographic character patterns.

On Hacker News

Recommended as one of the best explanations of Fourier transforms and a clear demo of analog optical computing.

Recommended by 5 HN people across 5 months · HN mentions 2021–2025

Topics

Everyday physics & science demosInformation theory & signal processingComputer vision, speech & NLP
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fourier transformoptical computingpattern recognitiondlp projectorlenses

What people said

jstrieb · 2022-08 · Strong recommendation

Reminds me of this really cool video about using Fourier Optics for optical pattern recognition.[1] The video happens to have one of the best explanations of Fourier transforms I've yet encountered. 1: [VIDEO]

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orlp · 2022-06 · Strong recommendation

For a somewhat related topic (analog image recognition), for those interested, I can highly recommend this video: [VIDEO]

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jstrieb · 2021-09 · Strong recommendation

I was introduced to this idea in a really cool video about using Fourier Optics for optical pattern recognition.[0] The video happens to have one of the best explanations of Fourier transforms I've yet encountered. [0] [VIDEO]

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Sources

Video by Huygens Optics, played through YouTube.

Data and selection notes

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HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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