Not at all, if the camera is in a fixed postion
relative to the green the perspective stays the
same and it's very easy to map. You only need the
2 edge lines start and finish, then move a %
down those lines with time.

If the camera is in a close-up it looks impressive
but I imagine the close up can be related to the
fixed camera if the close up cam is also fixed
at a known location.
-Roman


M. Adam Davis wrote:
>
> The easy part is putting the line on the green and not the players.  The
> hard part is determining the perspective that should be used for a given
> moving camera view...
>
> -Adam
>
> Roman Black wrote:
>
> >Mitch Miller wrote:
> >
> >>>Does anyone know how they impose the yellow 1st down lines on our screens?
> >>>
> >>Yeah, I always thought that was pretty clever how they make it look like
> >>it's actually laying just above the turf ... I'd have thought if they put
> >>it up via some form of post-processing, that it would look like a solid
> >>stripe across our screen, on top of players, etc.  Must be some pretty
> >>cool processing going on there.
> >>
> >
> >It should be pretty easy to detect the green
> >turf, not much green elsewhere. In RGB that's
> >very easy, then some simple size or detail-change
> >(movement) stuff to remove the players. Then just
> >put the line over the bright-green non-moving
> >bits. :o)
> >-Roman
> >
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