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…and different frequencies—these are spatial frequencies, not temporal ones

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Sinusoidal gratings can have different orientations…

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It’s called a sinusoidal grating because the grayscale values vary according to the sine function.

If you plot the values along a horizontal line of the grating, you’ll get a plot of a sine function

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**Any** image can be reconstructed from a series of sinusoidal gratings.

A sinusoidal grating looks like this…

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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👇🧵🪡

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