Dash Cam Wobble is Rolling Shutter? at DVinfo.net

Lewis Raymond · May 12th, 2021, 06:35 PM

Sent footage of my dash cam to the Nextbase tech support as the camera wobbles upon being stationary, with the suciton cup mount, and he replied saying: " I have reviewed the footage and this is caused by the way the shutter on the image sensor works and is called rolling shutter. The reason for the rolling shutter is the frequency of the engine is matching the image sensors which will cause this,. when travelling the wave motion will disappear. I have found that using the adhesive mount will help with this as the suction cup mount will help."

https://www.dropbox.com/s/9ay9r9er1w...0clip.mp4?dl=0

Can anyone confirm this? Just looking for second opinions. My other dash cam doesn't do this.

Andrew Smith · May 13th, 2021, 03:23 AM

I've downloaded the clip to view on my computer (not merely relying on replay via Dropbox's player) and it does indeed look like 'jello cam' distortion from a left-right wobble which is likely induced by the motion of rolling shutter sensor readout vs the engine. The footage of the tree at 17 seconds is where it is most noticeable.

If you can, would be good to have footage where you have shot the same journey with both dash cams mounted side by side in the vehicle. Also, idle vs non-idling rev speed for the vehicle engine may also be a factor in whether the jello effect is visually evident.

Additionally it's worth looking at is which frame rate each of these units is recording at. Your sample footage (assuming the file is direct from the camera) is recorded at 29.97 frames per second.

Andrew

May 12th, 2021, 06:35 PM	#1
Lewis Raymond Regular Crew Join Date: Jan 2017 Location: UK Posts: 33	Dash Cam Wobble is Rolling Shutter? Sent footage of my dash cam to the Nextbase tech support as the camera wobbles upon being stationary, with the suciton cup mount, and he replied saying: " I have reviewed the footage and this is caused by the way the shutter on the image sensor works and is called rolling shutter. The reason for the rolling shutter is the frequency of the engine is matching the image sensors which will cause this,. when travelling the wave motion will disappear. I have found that using the adhesive mount will help with this as the suction cup mount will help." https://www.dropbox.com/s/9ay9r9er1w...0clip.mp4?dl=0 Can anyone confirm this? Just looking for second opinions. My other dash cam doesn't do this.

May 13th, 2021, 03:23 AM	#2
Andrew Smith Equal Opportunity Offender Join Date: Feb 2009 Location: Brisbane, Australia Posts: 3,015	Re: Dash Cam Wobble is Rolling Shutter? I've downloaded the clip to view on my computer (not merely relying on replay via Dropbox's player) and it does indeed look like 'jello cam' distortion from a left-right wobble which is likely induced by the motion of rolling shutter sensor readout vs the engine. The footage of the tree at 17 seconds is where it is most noticeable. If you can, would be good to have footage where you have shot the same journey with both dash cams mounted side by side in the vehicle. Also, idle vs non-idling rev speed for the vehicle engine may also be a factor in whether the jello effect is visually evident. Additionally it's worth looking at is which frame rate each of these units is recording at. Your sample footage (assuming the file is direct from the camera) is recorded at 29.97 frames per second. Andrew