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From an altitude of 20,000 ft, DARPA's newest aerial surveillance camera, ARGUS-IS, can keep a real-time video eye on an area 4.5 miles (7.2 km) across down to a resolution of about six inches (15 cm).

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We thought the 41 megapixels in the Nokia 808 were exorbitant, but a team of US engineers have one upped the Finns by building a one gigapixel camera that is only(!) the size of a bedside cabinet.

from BBC News

US Army unveils 1.8 gigapixel camera helicopter drone

Gigapixel camera could screen you for cancer - http://vr-zone.com/articles/gigapixel-camera-screen-cancer/82640.html

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