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Video Signal must be digitised.
A device known as a frame storeor
frame grabber usually performs this task. It:
- Digitises the incoming video signal
- Samples signal into discrete pixels at appropriate
intervals -- line by line.
- Samples signal into a (8 bit) digital value.
- Stores sample frame own memory.
- Frame easily transferred to computer memory or a
file.
David Marshall 1994-1997