Additionally, the system needs to sense and react when players, officials, or the ball cross the projected first down line or when graphics are superimposed by broadcasters or sponsors so the line is not visually interrupted.
A total of eight computers are used to run the system: four SGI computers, one PC, and three computers that record and report broadcast camera data. Four people are also needed to ensure the system functions smoothly on game day: a spotter in the press box, an operator in the production truck, and two more operators on hand to make in-game adjustments such as accounting for snow or mud.
A detailed two-palette coloring system, inspired by the weather map on news programs, ensures that the line remains visible on the field, but does not show over people or objects as they move about the field. The field is processed as the first color palette, much like the green screen upon which the weather map is projected.
The second color palette analyzes skin tones, player and referee jerseys, and the ball, and sends that information back to the system to help inform where to draw the line in relation to other elements on the field. Once the system has determined exactly where the first down line should be drawn, the positional information and the raw video feed of the on-air camera are sent to a computer that draws the line 60 times per second. The line is then sent to a linear keyer to be superimposed onto the program video, which is delayed by a few frames in order to be accurately synchronized with the projected line.
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Typically a number is used instead of the word goal, such as "1st and 10", "2nd and 8", or "4th and 1". The goal line is the line that marks the front of each team's end zone. It's used to determine if a score is made. The line of scrimmage is just a regular yard line that always shows the spot of the ball on the field. You can see it as a blue line when watching football on TV.
The 1st down line is just a regular yard line that shows the distance a team needs to travel to get a 1st down. You can see it as a yellow line when watching football on TV. A scrimmage down is just a fancy word that means any play that starts on the line of scrimmage.
For short, people call them downs. When a team gets possession of the ball in football they are given a set of four scrimmage downs to move the ball down the field.
These scrimmage downs are called:. The 1st down line is initially placed 10 yards from the line of scrimmage. These colors will automatically be converted into yellow when the line is drawn on to the field. All of the other colors that could show up on the field—things like uniforms, shoes, footballs, and penalty flags—go into a separate palette. Colors that appear on this second palette are never converted into yellow when the first-down line is drawn. Sportvision had to deploy a truck and a four-man crew with five racks of equipment.
The cost has come down since then, and the process is now less labor-intensive. One technician using one or two computers can run the system, according to Sportvision, and some games can even be done without anyone actually at the venue.
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