Lecture 3: Sampling, Aliasing, Antialiasing (14)
glenn2763

For anyone interested in a cool example of shutter speed aliasing this video (https://www.youtube.com/watch?v=yr3ngmRuGUc) shows what happens when the shutter speed lines up perfectly with the rotation of a helicopter's (RIP Kobe) blades.

shadaj

Adding on to @glenn2763's example, there's a really great video from another channel that explains in depth the effect of changing the shutter speed as well as some other quirks with video recording such as scrolling scans: https://www.youtube.com/watch?v=mPHsRcI5LLQ.

et-yao

Gonna hop on this shutter speed thing and showcase a video that demonstrates effectively what Glenn has said, only it's a bird checking out the camera.

https://www.youtube.com/watch?v=Nyf79SI0U9Q

Really interesting how these things combine to create an effect we wouldn't normally be able to visualize. Also, it's a cute bird :)

FLinesse

Same here. Jumping on the shutter speed bandwagon addressing the phenomenon on the left. Why does the blade look curved? In fact, it stems from what @shadaj mentioned above, scrolling scans, see (http://resourcemagonline.com/wp-content/uploads/2015/11/Rolling-Shutter-Effect-on-Propellers-Explained.gif), except at a less drastic rate. The blade moves just a tiny bit as the image is scanned, resulting in the curved blade.

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