one more thing: take a look at 0:35 in the video of the first linek, when the shadow of the camera guy hits the desk, you'll be able to see the missing thing. That's the problem which occurs in changing environment/changing luminance
But really, I don't want to put the invention of these guys down, it's pretty impressive, but the whole maipulation thing is, as the Krauts say: "An old hat"
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