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Um. The effort involved in setting up an addressible infrared billboard is surely much more than simply wiring a message feed to where the security camera ia monitored in the first place? |
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//it can be seen by people with cellphones// Erm, cellphone cameras, Shirley? |
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Explanatory experiment: Look at the infrared LED on your TV remote through a digital camera's LCD screen, and press a button on the remote. You can see the LED light up. |
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Making an advertising billboard like this might be a good publicity gimmick. Put something strange on it that can only be seen through a digital camera, and see what happens. |
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