Abstract: Systems and methods for visualizing a ball trajectory in real-time. A method includes: preparing a plurality of images of a ball, each image of the plurality of images of the ball corresponding to a distance from a reference point; determining a position of the ball to determine a distance between the ball and the reference point; selecting an image among the plurality of images, wherein the selected image corresponds to the determined distance; using the selected image and determined position, rendering an image of the ball to be displayed on a screen; and transmitting the rendered image to a broadcast apparatus that broadcasts the rendered image in real-time. The images of the ball are rendered and broadcasted multiple times during a time interval so that a sequence of ball images displayed on the screen shows the trajectory of the ball in real-time.

Abstract: An apparatus for visualizing a ball trajectory includes a trajectory determination module configured to analyze motion videos of a flying ball captured by a plurality of cameras to determine a trajectory of the flying ball, said trajectory of the flying ball being defined by 3-dimensional coordinates; and an image rendering module configured to render a sequence of images of the ball from a batter's viewpoint based on the 3-dimensional coordinates, said image rendering module being further configured to control different background scenes to be included in the sequence of images of the ball as the ball approaches toward the batter in the sequence of images of the ball.