Blinking LEDs - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 4 Old 12-06-2013, 02:04 PM Thread Starter
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Blinking LEDs

I have two clusters of LEDs on my V Strom to augment the tail and brake lights. When the rear of the bike is caught on video the LEDs appear to be blinking but they are not. Any video expert have an explanation why this happens? Is it somehow related to the way wheels at times appear to go backward?
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post #2 of 4 Old 12-06-2013, 05:32 PM
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From Google:

Some LED displays are multiplexed which means they are flashing on and off in a way that is not discernible to the naked eye and produces no visible flicker. However when the LEDs are viewed on TV they aren't in sync with the TV frame rate and as a result appear to flicker. It's like watching wagon wheels on an old western movie, the wheels appear to go backwards or forwards depending on how they sync with the 24 frames a second rate of the film, it's the same with the flicker of multiplexed LEDs and 25/30 frames a second TV pictures.
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post #3 of 4 Old 12-06-2013, 05:50 PM
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Quote:
Originally Posted by keetmanaa View Post
I have two clusters of LEDs on my V Strom to augment the tail and brake lights. When the rear of the bike is caught on video the LEDs appear to be blinking but they are not. Any video expert have an explanation why this happens? Is it somehow related to the way wheels at times appear to go backward?
The eye is a very slow organ...
Ever see spots when a camera flash goes off in your face?

Those LEDs are flashing very fast; So fast that your eye doesn't register it.
Most TV and computer screens do the same at approx 60Hz (60 flashes per sec) It's called, "Refresh Rate"


Video cameras also flicker... Don't think of a video camera as taking video... Think of it as taking many snapshots in succession at a very high rate.

The problem is when the video camera's snapshots line up with the LEDs off time.
Since the camera's refresh rate and the LED's refresh rate are not perfectly in sync, some of the frames on the camera pick up the LEDs on and some pick it up as off. Hence, flashing.

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post #4 of 4 Old 12-07-2013, 08:02 AM Thread Starter
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Thanks guys, mystery solved.
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