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'[OT]: Urgent, Video Generator for PIC micro'
2000\06\06@235414 by Bob Ammerman

picon face
Don't know about OSD chips, but I have got a PIC18C452 generating a
full-screen graphic and text image, including some simple animations,
without _any_ external hardware (except 3 resistors). Resolution is 448H x
220+V pixels.

Trying to 'genlock' this to an existing composite signal might a be a bit
difficult, though.

Bob Ammerman
RAm Systems
(high performance, high function, low level software)

{Original Message removed}

2000\06\08@024402 by Robert Rolf

picon face
Can you mirror image your display by reversing the connections to the
horizontal deflection winding on the yoke of your monitor?

Bob Ammerman
RAm Systems
David Huisman wrote:
> That is exactly how we currently mirror the display, the problem is that it
> mirrors the text also, we want the text normal but display mirrored in one
> of the modes of operation.

How do you manage to get the convergence signals to work correctly
on a reversed deflection? Somewhere you said your video was
RGB so I'm assuming you're using a color monitor.

One can also mirror a display digitally. You just need a
fast A/D, D/A and a bit of RAM. Basically you digitize the video,
and store it into one bank of RAM, while you're reading out the OTHER
bank of RAM in reverse order (xor on the address lines makes this
reverse addressing trivial to do, and lets you use a common counter
chain). This has the advantage of allowing you to use 'standard'
monitors as replacements, and to use big screen TVs etc. without mods.
(Most LCD projectors have a mirroring function).

> Thus, we need to mirror the text before the display,

Could you not use a small front surface mirror in front of the
camera to do this reversal optically? It could also make your
project thinner (depending on how long your camera is). Of course
you may already be using a mirror, which is what caused this problem
in the first place.

Maybe if we had a few more details on what you're trying to do we
could come up with a more optimal solution.

2000\06\08@030603 by David Huisman

The digitally reversed image is a good idea and would do the trick and we
will consider that option if we cannot find a suitable off-the-shelf IC to
do this. Then we add the text after. This saves cost on the monitor. We are
using a colour LCD monitor that comes with mirror function built in.

The application is in a vehicle and the driver can change between mirror and
normal view at the flick of a button. We already have these going but now
want to add text as cheaply as we can but not involving too much development
time also.

It seems the NEC6566 may actually do what we want but their doc is not that
clear to us. It has Vrgb, Vc1 and Vc2 outputs. I assume that Vc1 and Vc2 are
both colour composite outputs.


David Huisman

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