Stroboscopic effect?
Thread Starter
Burning Brakes
Joined: Aug 2008
Posts: 1,100
Likes: 277
Stroboscopic effect?
Anyone else notice the stroboscopic effect when using the rear view camera?
Corvette had not been driven for a spell ‘til a two day trip last weekend.
Found it particularly noticeable when vehicles with large spoked wheels (e.g. tractor trailers) were seen.
Cheers!
Corvette had not been driven for a spell ‘til a two day trip last weekend.
Found it particularly noticeable when vehicles with large spoked wheels (e.g. tractor trailers) were seen.
Cheers!
Melting Slicks
Joined: Sep 2020
Posts: 2,833
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From: Kelso, Wa
It has to do with the frame rate of the camera... You'll see it also occuring with LED headlights. Same thing as watching wagon wheels in movies. They'll look like they're turning backwards
Drifting
Joined: Apr 2021
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From: Chicago-ish
Just you wait until a black or white Ford Explorer gets behind you and you see that effect on their headlights. But yes, that’s completely normal due to the refresh rate and how screens draw lines sequentially.
Race Director
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E-Ray, 3LZ, ZER, LIFT
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Hard to see wheels, I guess unless crossing behind!
Drifting
Joined: Dec 2019
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Fun fact, LED lights aren't on solikd, they blink on/off very fast. Too fast for the human eye to notice, but when a camera is filming them, some of the frames catch the LED lights off, and give you that strobing or flickering effect.
Anything, like wheels, that move/change more times per second than the frame rate of the camera, usually 24 or 30 fps, you'll see some form of distortion or affect.
Anything, like wheels, that move/change more times per second than the frame rate of the camera, usually 24 or 30 fps, you'll see some form of distortion or affect.
Racer
Joined: Mar 2016
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I don't know about cheap - there are few to none consumer grade cameras that are not affected in some way by LEDs. You have to go up to REALLY high grade commercial stuff to make it 100% not affected by LEDs. And no, no high end car maker has those on any of their cars. I've been in Aventadors that show the same thing.
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From: North Dallas 40 TX
I don't know about cheap - there are few to none consumer grade cameras that are not affected in some way by LEDs. You have to go up to REALLY high grade commercial stuff to make it 100% not affected by LEDs. And no, no high end car maker has those on any of their cars. I've been in Aventadors that show the same thing.
There are LED drivers that vary brightness, by varying the current rather than On-Off pulsing of the voltage (there is a minimum voltage needed to send current through the diode (leD)), but the drivers are more expensive, so guess what is used the most.
Melting Slicks
Joined: Aug 2004
Posts: 2,165
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From: Keizer Oregon
It's called Aliasing and has to do with the frame rate (sample rate) of the camera vs the Pulse Width Modulation (PWM) of the lights use to control dimming/drive in modern lighting. It's a bit like wheels looking like they are turning backwards when filmed at certain speeds.
It could definitely be improve with bandpass filters on the camera image processing.
It could definitely be improve with bandpass filters on the camera image processing.
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