Camera Shutter
Notes from Cyrill Stachniss.
Shutter speed controls how much light you are letting in.
Rolling shutter
- The shutter rolls (moves) across the exposable image area
- The pixels at the same line of the image are recorded at the same time § Produces distortions in case of fast-moving objects or cameras
- Often found in CMOS cameras
Why are rolling shutters used?
Because they’re very CHEAP. https://www.quora.com/Why-are-rolling-shutters-still-used-in-digital-cameras-instead-of-global-shutters
Rolling shutters read one line after the other.
- This is kind of how a LiDAR works!
Are most cameras rolling shutters?
It depends. Many DSLR and mirrorless cameras use a mechanical focal-plane shutter, which is not the same as a rolling shutter.
You actually need to take this into account.
The other one is a global shutter
- The whole image is recorded at exactly the same time
- No rolling shutter distortions
- Preferable for geometric reconstruction task
More expensive to produce, so we don’t find them as often.
