Potentially, yes. However most CCD readout amps are AC coupled so you
might not have any charge to read since the settling time will also
be extended 10 fold. This will also increase your camera sensitivity
10 fold (IF the readout bucket brigade can handle the slower clock rate.
Think DRAM refresh capacitances).

One trick that was used decades ago for slow scan television (amateur
radio TV in a 3khz BW) is a sweep fast sample and hold.
You basically use a ramp generator at the horizontal rate and
monostable S&H driven by a comparator whose second input you control.
With a low voltage, you sample the left edge of the video, and with a
higher voltage, the right side. You can use a slow ramp generator
(15seconds was what was used for SSTV) for automatic sweeping.

This gives you 15k samples a second (easily within a PIC's capability)
and allows you to use ANY standard video signal as input (as long as
it doesn't change over the sampling time).

It's easy enough to test the idea. Just look at the 10x slower
video output to see if it 'looks right'.

Robert

Roman Black wrote:
>
> Has anyone tried this camera trick??
>
> I want to connect one of those cheap "camera
> on a PCB" things, (you know the monochrome
> ones with standard composite video output
> that you can buy almost anywhere) to a PIC and
> use the PIC for image recognition, to detect
> the position etc of SMD chips on a white
> surface.
>
> My (late night) idea is to get a cheapy
> camera and change it's one obvious crystal
> to a slower speed one, a very easy job.
> So instead of a 15625Hz line rate you get a
> 1500Hz line rate etc. Obviously going from
> 25 frames/second to about 2.5 frames/second.
>
> BUT then of course the rate is slow enough
> for a PIC to do processing and work as an
> effective robotic vision system to detect the
> position and orientation of the parts shown
> on the camera.
>
> So will it work? I'd love to hear from anyone
> who's done this trick or similar camera tricks.
> :o)
> -Roman
>
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