Technology to track fast moving objects is currently being developed by researchers at the University of Tokyo. This new technology promises to revolutionize sports coverage as it is able to quickly track fast moving baseballs, soccer balls, and footballs. Researchers have started field trials to see if it will perform as well outside as it has in the lab. If successful, this technology could be broadcast ready in just two years.
The system uses lenses and mirrors combined with a fast-tracking system to keep the ping-pong ball in focus and centered in the frame. It follows the movement rather than trying to predict it. This same technology could also be used in conjunction with a projector. The projector could, well, project an image onto the item being tracked, potentially turning your ping-pong ball into an emoji.