CMOS rolling shutter and Mercalli

Laurence wrote on 4/10/2008, 6:55 AM
Well after swearing up and down that the CMOS rolling shutter of the new Sony cameras really doesn't matter except for photographer's flashes, I have found another situation which is very common and quite annoying where rolling shutter has a noticable effect:

That is when you stabilize shaky footage with Mercalli. Mercalli does a wonderful job, but the stabilized CMOS footage can have a sort of liquidy wobble about it when you try to stabilize hand held zoomed in shots.

Comments

Robert W wrote on 4/10/2008, 9:02 AM
Deshaker in VirtualDub had a routine to handle rolling shutters, so it is in some way treatable. Does the Mercalli plugin work straight from the timeline?
johnmeyer wrote on 4/10/2008, 9:22 AM
Yes, deshaker definitely has a setting for this, although I don't know how well it works.
farss wrote on 4/10/2008, 2:31 PM
It's impossible to deskew with 100% certainty.
If you have multiple things in motion in different directions even if you can compute how fast they're travelling and how to correct that (which can be done) you're still left with a problem. The skew causes moving objects to obscure static parts of the frame and there's no way to correct that.


Bob.
Laurence wrote on 4/10/2008, 8:25 PM
The way to work around it in Mercalli is to leave a little motion in rather than to totally lock it down. Don't get me wrong. I'm still very happy with the CMOS camera, but it is an issue that I'm sure is going to start coming up as people start stabilizing CMOS footage.