What's an image made of?

There are many correct answers.

But the most fascinating one is: << sines & cosines >>

Read on if you're intrigued👇🧵🪡


@s_gruppetta this is so cool! I am intimately familiar with Fourier series for time series analysis and dynamical systems, but for some reason never connected the dots to images (pun intended). Thanks for sharing!

@mattkram Thank you! In a previous life, I was an optical physicist, so for me, the Fourier Transform is in 2D first and foremost, and for spatial data. When I see 1D Fourier transforms in the temporal domain I need to readjust!

A lens is a real-life Fourier transform calculator, after all!

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