From: "Frank Bemelman"
Subject: Re: video capture with microcontroller
Date: Wed, 13 Nov 2002 22:32:42 +0100
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Organization: EuroNet Internet
NNTP-Posting-Date: 13 Nov 2002 21:32:50 GMT
"Spehro Pefhany" schreef in bericht
> On Wed, 13 Nov 2002 20:52:26 +0100, the renowned "Frank Bemelman"
> >The quick answer is dualported ram, a fast ADC and some glue logic.
> >The video is digitized by the ADC, for each pixel a value is stored
> >in ram. The microcontroller reads the dualported ram at it's own
> >speed. You can build a simple one this way, and read the dualported
> >ram using a PC's printerport.
> For still pictures in video format, I'd imagine you could sample
> multiple frames to get the information. I don't know where you'd
> store it in a microcontroller, few have more than 1K of RAM,
> unless it's off-chip.
We can solve that with larger pixels! OTH, the image is in the
dualported ram, so we can analyse that data, no need to move it
to controller ram first. Trigger->snapshot->analyse etc. Okay
for simple tasks, such as 'how much beer is left in the bottle'
or 'is the label not skewed too much'. Effective Iris identification
takes a bit more effort. I wouldn't know how to tell the difference
between Pamela Anderson and Ben Turpin .
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