[Bf-vfx] Improving the 2D stabilization tool :: Next Steps

[Ichthyostega]

Am 08.06.2014 17:23, schrieb Sergey Sharybin:
> A for shear/trapecoid -- i'm not really sure what's that. Artifact caused by
> the rolling shutter?

As said, due to perspective.
It is caused by yaw and pitch movements of the camera (in Blender terms,
rotation around x and y, where z points into the direction of the focal length).
After you've done a perfect translation, rotation and scale compensation,
in the general case these kinds of movements will be left over and quite
noticeable

Shearing and trapezoid can also be caused by lateral movements, but in this
case it includes paralaxes and can't be compensated completely; but even then
a partial compensation would be helpful.


For an example: think of an shot with hand camera, where the operator
was able to hold the camera quite steady (shoulder or such), but there are
slight remaining movements. Now you want to do masking and rotoscoping.
This is a classical example for 2D stabilisation; going through 3D is
typically not an option, because the shot doesn't contain much paralaxes,
which is a prerequisite for camera solving.

	-- Ichthyo