We've been using some off-the-shelf LCD HDTVs in a 3D vision system. The
system relies on being able to flip (mirror image) the picture on one of
the monitors.

The feature was built in to the TVs we were using, but those models have
been discontinued, and we're having trouble sourcing this feature
elsewhere.

Any educated guesses on how difficult it would be to add the feature
ourselves? If it matters, we're talking about a vertical flip, not
horizontal.