In 1975, Kodak released the world’s first digital camera, a
clunky-looking device that used casette tapes as the medium to store
pictures. Each photo took 23 seconds to snap, producing a 100-line black
and white image that could only be displayed on a television set. No
wonder why it never became popular.
http://www.geeksaresexy.net/2008/05/08/worlds-first-digital-camera/