In 1911, Boris Rosing and his student Vladimir Zworykin created a system that used a mechanical mirror-drum scanner to transmit, in Zworykin's words, " very crude images " over wires to the " Braun tube " ( cathode ray tube or " CRT " ) in the receiver.
22.
Modern scanners typically use a charge-coupled device ( CCD ) or a contact image sensor ( CIS ) as the image sensor, whereas " drum scanners ", developed earlier and still used for the highest possible image quality, use a photomultiplier tube ( PMT ) as the image sensor.
23.
Instead of using the scanner's true "'optical resolution "', the only meaningful parameter, manufacturers like to refer to the " interpolated resolution ", which is much higher thanks to software interpolation ., a high-end flatbed scanner can scan up to 5400 ppi and drum scanners have an optical resolution of between 3, 000 and 24, 000 ppi.
24.
For sustained professional use the apparent cost advantage of scanning film was very much reduced on careful analysis; including expensive 10?2.5 cm ( 4? & Prime; ) film and processing and the cost of use of a drum scanner brought the projected cost over three years to about 80 % of the cost of a digital back at the time.
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