how are the first down line and line of scrimmage made on tv?

Question

on TV when you watch football, the yellow and blue lines that mark the first down line, and the line of scrimmage.
Those lines do not cover players, refs, and even logos on the field. Awesome technology, dont know how it works, though.

Answer 1

This is the complicated version. Each football field has a unique contour (not perfectly flat) so a 3D model is made of the field prior to the game. It also has a unique color palette, typically various shades of green, depending on the type of surface (i.e. real or artificial grass) and the weather (e.g. bright, shady or even snowing).
There are a number of cameras on the field. Each one has a computer within it that monitors how the camera is used during the game (pan, tilt, zoom, focus and extender) and transmits that info live to the Sportvision production truck 30 times per second. This information helps keep the yellow 1st & ten line in the proper place without being distorted whenever the camera follows the players or the ball.
There are seven computers in total and a crew of 4 people. Two crew members, one inside the stadium and one in front of a computer, communicate the position of the real first down line to make sure everything is working. Another crew member is a troubleshooter. The last crew member monitors the various colors that will make up the color palette onto which the line is drawn.
The first computer in the truck gathers all the separate readings from the cameras and transmits a single, consolidated data stream to the central computer.
The central computer takes these readings, the 3D field model & color palette, the knowledge of which camera is on the air, and together using a geometrical calculation determines which pixels in the video frame would make up the first down line. All pixels that are obstructed by a player, a referee, the ball or any other object are identified and not included in the calculation. This will ensure that the 1st & Ten line will be projected only onto the field.
This technology is also the basis for showing ads where they may not appear (i.e. behind home plate in baseball during national broadcasts), and Race F/X in which images can be displayed on the race track, and info can follow a specific car, no matter what the camera does. This technology is used by Fox, ESPN, NBC, and TNT.

Answer 2

whilst the offense gets on the sector, the line of scrimmage is 10 yards removed from the 1st down marker, yet whilst a penalty is named earlier or for the duration of a regular down play, those yards would be extra or subtracted to the ten yards.(ex: protection jumps offsides< 5 backyard penalty> 1st down and 5; o-line attracts fake initiate<5 backyard penalty> 1st down and 15) i'm hoping this enables you comprehend the downs greater powerful

Answer 3

they make it so you can see it on tv but not on the field.

Answer 4

It is made out of frosting.