Le 29/01/2021 à 02:07, David B via
groups.io a écrit :
It seems for the best view when focused on a single point would be
the circular motion because it is more like the natural geometry
of the human eyes. Where this may be worse is when you shift your
attention through the image on locations that are not a this focal
point. Then it can be less natural?
Maybe for best viewing of other points throughout the image a flat
pan is better?
When you are shooting with cameras aligned perfectly parallel, the
image is a circular scan of the field of view. When viewed at
screen, this circular scan is perfectly restored on your screen, and
you have to converge to see it exactly like in a natural viewing.
When you are shooting with convergent cameras, when restored at
screen, the rotation appears as a wrong viewing angle. Your screen
is flat, and you do not have the possibility to restore the
original viewing angle of your cameras. At least, you need to get
two screens to display with a viewing angle between both to
restore the shooting conditions.
Here is a small diagram:
- top left: at shooting time, the cameras are well parallel. The
green line is what your cameras are shooting, supposed to be
displayed later on your screen. Red and blue lines are
displaying what is shot for a far and a near object.
- top right: you display both pictures aligning the nearest
point to fit the same place on your screen, with a zero
parallax. All the scene is restored for your eyes exactly at the
same place as the shooting time, in a natural viewing angle for
the far object. This is the only way you can get the exact
viewing effect on your single flat screen as at the shooting
- bottom left: at shooting time, the cameras are pointing a same
place on the scene. The green line is style what your cameras
- bottom right: you display both pictures, still aligning the
nearest point to fit the same place, with a zero parallax. You
see that the original far object now have a much larger parallax
at screen, even with a high risk of divergence. If you want to
restore the original parallax of the far object, you need to put
the nearest object in front of your screen, with a strong
negative parallax. You simply can't get back the natural viewing
angles between both views as at the shooting time, except using
2 screens with an angle between them.