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InjuryApart6808 t1_jears30 wrote

Reply to comment by BreakfastBeerz in Humanoid robots using cameras for eyes will likely experience issues and accidents around spinning objects such as propellers, due to frame rates by scarronline

Our eyes don’t work like a camera.

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V_es t1_jeasckz wrote

Our eyes have a limit of what we can comprehend. High speed cameras and faster data analysis- not.

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InjuryApart6808 t1_jeat1kj wrote

So, according to his logic, if the human eye processes between 30-60 frames. A light flashing or fan spinning at 30-60 times per second would appear stationary.

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BreakfastBeerz t1_jeattwz wrote

You mean like when you watch a fan or airplane propeller start up and the blades start to appear to slow down, then stop, then go backwards and then disappear all together?

https://www.youtube.com/watch?v=6IV_sa9_IxU

Take a guess at what point in the video the blades are turning at ~60 times per second

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InjuryApart6808 t1_jeauqfi wrote

You’re using a video captured by a camera. You’re actually proving my point. The camera is likely recording at 60 fps.

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Fiberdonkey5 t1_jeaxk8c wrote

This can occur with the naked eye as well. Spinning motor shafts can often appear stationary when looking at them which is why there is a tool called a stroboscope that rapidly flashes light at variable speeds so you can visually see if the shaft has stopped spinning.

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BreakfastBeerz t1_jeav3c9 wrote

You are correct, cameras work a lot better.

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InjuryApart6808 t1_jeavfky wrote

Not if something is spinning at the frame rate of the camera. Which is what the post is about. Then that object would appear stationary. Human eyes don’t do that, it would appear as a blur, and we would infer that the object is moving.

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BreakfastBeerz t1_jeb091n wrote

You've never watched an airplane propeller start up? It does exactly that, it appears to slow down, stop, go backwards, then it disappears.

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ForumDragonrs t1_jebajwf wrote

I also see this a lot with car tires. If you watch a video of someone on a dyno, you'll likely start to see the tires slow down and then go backwards.

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