Talk:Front projection effect
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Introvision: enormously confusing
"In IntroVision, the black velvet is replaced by another Scotchlite screen that reflects the image back towards another Scotchlight screen placed before the performer." What? I mean - what?
- Where is the black velvet normally located - is it to one side of the area in view of the camera? Is it at 90 degrees, like a side wall, or oriented the same as the screen behind the actor?
- The second screen in Introvision, or velvet in normal front projection, catches light which "is not reflected towards the scene". So, that sounds like light other than that which is projected onto the primary screen - stray side light, or something - so how can it form a coherent image?
- It "reflects the image back towards another Scotchlight screen placed before the performer." So - is this other screen between the performer and the camera, in which case it would block the view, or is it behind the camera, in which case it couldn't be seen? Neither seems useful.
- It "lands on two different screens creating a 3D effect". This sounds like stereoscopy is involved in some way, but it's not at all clear how.
The entire section on IntroVision was confusingly written, so I looked up the patent and cited it, and provided references that illustrate the process. The complexity of the optics involved is difficult to convey, so I revised with a more general description of what the process does, how its results differ from more traditional front projection, and cited the mechanical elements. MrNeutronSF (talk) 07:59, 5 August 2009 (UTC)
No Palmquist patent for Front projection; Will F. Jenkins, instead
Palmquist patented Reflex-Reflective materials in US patents US2407680 A, US2294930 A, and US2567233 A. These patents are assigned to 3M.
However it is Will F. Jenkins who patents actual front projection in US2727427 A, and US2727429 A, filed in 1953. He licensed these personally.