This doesn't involve a mobile phone (at least not yet), but it shows how valuable scanning an image in the physical world will be.
From NY Daily News N.Y.C.'s crime fight to get more eyes
The NYPD is installing 505 surveillance cameras around the city - and pushing to safeguard lower Manhattan with a "ring of steel" that could track hundreds of thousands of people and cars a day, authorities revealed yesterday.
The NYPD also has applied for $81.5 million in federal aid to install surveillance cameras, computerized license plate readers and vehicle barriers around lower Manhattan, Police Commissioner Raymond Kelly said.
The cameras capture images of license plates and drivers' faces. Officials then run the license plates through a database of stolen cars and terrorism suspects
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This is similar to the "ring" around London's CBD, which has been there for many years. Several cameras were involved last I saw, quite comprehensive. The plate reading technology has since been widely deployed for things like speed detection and toll evader identification. CCTV biometrics are also widely used eg. identifying soccer hooligans in a sea of faces at some European stadiums.
I've wondered since phone cameras appeared whether one could combined a dash of this, a dollop of ZoneTag-esque LBS, and a sprinkle of camera contol to achieve an interesting result.
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