07 January 2009

How the yellow "first down" line is generated


Anyone who watches American football has to appreciate the usefulness of the yellow first-down line on the screen. You know that it's a virtual line, so it has to be "done with computers," and you know that it must be complex because this is a moving image and the line is under the players and referees.

If you're curious about how this is done, the explanation is available at HowStuffWorks.

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