Hi Yoann,
There are basically 3 types of shutters used in cameras:
1. Mechanical shutter
2. Electronic shutter
3. Hybrid shutter (mixture of 1 and 2)
When it comes to electronic shutters, you can either have a
rolling electronic shutter or a
global electronic shutter (= total electronic shutter). Most digital cameras use a rolling electronic shutter, which leads to the rolling shutter issue we try to avoid for photogrammetric processing.
Note that some cameras use an electronic shutter for live view (& video) and a mechanical shutter for still photographs (e.g., the camera used on the DJI Phantom 4 Pro).
I am not aware of a 'rolling mechanical shutter' issue because the information from the sensor is not read line by line but in one go, hence no rolling shutter issues.
If your camera is moving during photo acquisition (e.g., camera is mounted on drone/UAV), you have basically four options to mitigate the rolling shutter problem:
1. Use a camera with a mechanical shutter
2. Use a camera with a (hard) global shutter
3. Compensate for the rolling shutter effect in post processing (as it can be done in Pix4D and Agisoft PhotoScan)
4. Change your 'survey design' (i.e., stop for each image) and adjust the camera settings (i.e., higher shutter speed)
Regards,
SAV
Thanks for this detailed answer !
Since, I've red somewhere that mechanical/electronic shutter doesn't mean global/rolling shutter.
So we could have a rolling mechanical shutter (?) or a global electronic shutter (which is actually exist)
May you confirm that point ?
Regards
