There are some other issues when you slow down the clock. In CCD
camera's
there is a limit to how long you can image before the CCD will saturate.
Just
slowing down the clock will extend the imaging time. The new CMOS
camera's
are relatively easy to interface to, in some cases the video is
digitized within the
camera sensor.

w..

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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