Robert,
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.

Regards

David Huisman