Скачать или смотреть Baseball's Parallax Effect - Check Swing Angles Prove Deceptive

From Washington's broadcast, Umpire Tom Woodring's check swing strike three call on Tampa Bay's Mallex Smith looked like the correct call, but from Tampa's TV replay, it looked completely wrong. Why?

The answer is the parallax effect, which causes a viewer to see the same object differently relative to a background when viewed from two or more different angles.

The defense here—Washington—opted for a television replay taken from the camera well at the edge of the third-base dugout located closest to home plate, while the offense—Tampa Bay—used a camera angle from deeper into foul territory and at the opposite end of the dugout (nearest to left field).

Due to the parallax effect, videos from these two angles played a visual trick in appearing to show two different plays, as Washington's camera angle closest to home plate suggested that Smith's bat travelled farther through the hitting zone than did the view from deep third nearest to the spectator area in foul left field.

Watch as the parallax effect is explained using 3D simulation of a similar virtual check swing, as well as an example in hockey, relative to a puck that either has or has not fully crossed the red goal line.

Then watch as the parallax effect is visually demonstrated, thanks to the virtual 3D simulation, as the camera is raised, titled, and moved, giving an entirely different view of the object relative to its background, thanks to this new angle and viewpoint.