AccessMyLibrary provides FREE access to millions of articles from top publications available through your library.
Byline: Jeff Elder
Q: How do they make those electronic first-down lines on TV during NFL games? _ John Adams, Indian Trail, N.C.
A: They do it with technology that hustles more than a crazed Ray Lewis in the fourth quarter.
The yellow stripe is created by a video system called 1st & 10. It examines every frame from every camera 30 TIMES A SECOND.
1st & 10 gathers precise information about each camera's view, tilt and angle, and monitors which camera is on the air. It then uses a 3-D model of the field to map the line.
Another part of 1st & 10 breaks the colors of the video broadcast into two palettes: One for the players, and one for the field. The colors for the players (their uniforms, shoes, skin) is never drawn over by the yellow line. …