On Tue, 2021-02-09 at 22:44 +1100, Stephen Morris wrote:
Just one question, what do you mean by green screen? I use zoom on
my work laptop in Windows 10 showing static and animated backgrounds
behind the camera image so that people can't see anything in the room
behind me, and I didn't think there was anything special in my zoom
configuration.
There's a few ways a device could detect the foreground (you) from the
background (everything else) and use an alternative background image:
Detect a particular colour (like a green or blue background).
Detect a particular level (like a bright white or black background).
Something like MPEG compression. Where any pixels that change due to
movement are foreground, anything that stays static would be the
background. That has the potential for some very trippy effects when
it gets it wrong.
The same kind of thing could be done by storing a still image from the
camera before you step in front of it, and always comparing it with the
current live camera.
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