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  Digital Cameras Reveal Hidden Messages?  
 
 
Posted 2007-08-13 by Tony Walsh
 
 
     
 
David Fono introduced me to Kameraflage, a display technology that takes advantage of the fact that digital cameras can "see" infrared light. Content rendered in infrared light--normally invisible to the naked eye--can be viewed and photographed digitally.

The Kameraflage web site indicates the technology will be used in cinemas, facilitating per-person subtitling (viewers watch the movie through their camera-enabled device), but I don't think much of this application. Why watch a movie while sitting in a theater through a cameraphone? In my view, the killer app for Kameraflage is in stamping cinema screens with a geo-temporal watermark so that pirated copies of movies can be tracked more effectively (or obscuring the screens completely to digital cameras). I'm not sure why Kameraflage technology would be needed for this--if there's such a thing as infrared lasers, it'd be trivial to use existing technology to paint over the screen.

Until this weekend, I had no idea that infrared light could be photographed with an unmodified digital camera. As David points out, "The mobile phone becomes a personal magnifying glass that reveals secrets — and every object becomes a potential clue." Lots of applications here for games involving the real world. If standard computer screens and TV screens could emit an infrared layer, even more possibilities open up.
 
     
 
   
 
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Comment posted by qDot
August 13, 2007 @ 1:11 pm
     
 
Until this weekend, I had no idea that infrared light could be photographed with an unmodified digital camera.

Yup. Little science experiment: If you ever need to check the batteries in your TV remote, press a button and point your camera at the IR emitter on top to see if it's working. :)
 
     
 
     
   
 
Comment posted by Jos 'Hyakugei' Yule
August 13, 2007 @ 1:52 pm
     
 
This is one of the reasons i bought the digital camera i did - so i could do near IR photos. Having instant feedback for your IR photos is amazing. Its usually such a pain to do IR photography, but when you have a digital camera which can do it (and the above comment is how you can check if yours does have IR), it becomes so much quicker and interesting! Heck, you can even do IR in real time, with the right filter. Ah, photography...

Here are a couple of links to Digital IR stuff that i read when i was starting to work with this stuff:

http://echeng.com/photo/infrared/tutorial/

and

http://dpfwiw.com/ir.htm
 
     
 
     
   
 
Comment posted by Tony Walsh
August 13, 2007 @ 3:16 pm
     
 
Thanks for the info, guys. I learn something new every ten minutes, it seems.
 
     
 
     
   
 
 
     
 
     
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