Jim Henderson wrote:
> On Tue, 10 May 2005 22:18:13 +0100, scott wrote:
>
>> I don't see why it isn't possible.  The projector is lighting one
>> tiny segment of the card at a time, if it hits a red bit, the book
>> is going to be lit with a red hue, very easy to pick up by the
>> camera.  Once it's scanned the whole card, it would be easy to build
>> up the picture.
>
> That's the trick, though - the projector shown in the video, unless
> I'm terribly mistaken, is just a standard video projector (the type
> you might plug a PC into to project it on the screen) - so the
> projector is in fact lighting the entire book/card scene all at the
> same time.

You are not mistaken, it is a *projector* and not a light bulb exactly so
they can light up one point at a time.  They just display a black image on
the projector with one white pixel, and move that pixel about.  It's the
same as having a very narrow spotlight and moving it about.

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