A technical explanation of a project I'm cooking up, in all it's unabashed geek glory! (flame my geekdom all you want, YT viewers... unabashed, ya hear me??)
To make the illusion really work, don't focus on the shadow - focus on the hypothetical body that would cast that shadow.
Check out the accompanying video (video 2/2) at:
http://www.youtube.com/watch?v=cxiB7uNxztc
Also, check out the (unabashedly geeky) blog at:
http://www.phedhex.com/blog
The solution to the shadow artifacts would be to do some roto paint on the image to clear off some of the debris. You might also try a difference matte... and, you could shoot the person on a green screen. One thing to note about your projector setup is that you'd need to correct the video keystone distortion. That can be done from within some projector's menus, or you an do that to the footage to correct for the pitch.
gabrielnaylor 4 years ago
Cool. Thanks for the roto advice - that seems to make sense. Yeah, we tried a greenscreen but it doesn't look like we have a budget to do it properly (with correct lighting and enough material to cover an entire stage).
About the keystone - If the camera and the projector are in the exact same location and orientation, all camera distortions and projector distortions undo one another.
phedhex 4 years ago