Play INC, has a product called 'Snappy' which uses a parallel port
interface to digitze video.

A very old article in Byte magazine has 8080 code for using a
parallel port digitizer based on an obsolete RCA chip, but will show
you how to preprocess the video for the A/D.

There are many circuits to be found in various manufactures
app notes (Phillips, SGS Thomson, Analog Devices etc.).

If speed and quality are truely not an issue, you can use a
PIC's on board A/D in 'slow scan' mode to digitize. Basically you
detect horizontal sync, and some microseconds later sample the
video. You progressively increase the delay until you have
scanned across the entire line. Conversion time becomes irrelvant
as long as you have a fast sample and hold (not that you need one
if you only want a few dozen pixels across the screen. A 20Mhz
PIC will easily give you 640 pixels across.

As a minimum look at the National LM1881 or the much better
Elantec 1101??? sync separator for triggering your PIC.

Mthinks you are going to have to specify the problem a little
more carefully if you want the correct answer.
There is probably a solution out there already that you could
just purchase.

Robert

>    joep schroen wrote:
>
> Hello picers,
>
> I've got a problem, I need to read in a steady video signal from a monochrome camera. The output must be 8bit Parallel data, the input is a composite video signal. Speed is of no means, even quality is not important.
>
> Is there anybody in here who has some suggestions to make this hardware?

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