[Laser] Polarization Subtraction

[Tom Becker]

Re: 
http://www.laserfocusworld.com/articles/print/volume-48/issue-10/world-news/novel-cameras-polarization-difference-imaging-camera-reveals-unseen-features.html

Could not a frame-synchronized rotating polarizer produce 
alternating-polarization video frames that could be subtracted and 
normalized?  There might not be much detail among much noise, but the 
difference should be visible, I expect.  Has that been done?

Tom