Re: optical pattern tracers

On Dec 8, 9:08 am, Joseph Gwinn <joegw...@xxxxxxxxxxx> wrote:
In article <493d9662.20054...@xxxxxxxxxxxxxxxxxxx>,

 no...@xxxxxxxxxxx (dan) wrote:
One more thing Joe,

Many of the tracers that I've seen on the WWW, can trace a solid
silhouette.

How does that work?

I can think of a number of ways.  One way has a 9-sensor grid and
detects edges, but I suspect that given the expense per sensor channel
back then, it wasn't done that way.

They may have servoed to a constant output (not zero) from the head, but
this requires knowing something about the orientation of the edge, which
is circular.

Ill think about it.

Joe Gwinn

Video cameras are cheap these days, ditto computers to do the image
processing. Software is cheaper than hardware these days.

Stan
.

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