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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