100 broadcasters including BBC, NBC, Globosat, Terra, TV Record, Televisa, and Uno TV, are all using a remote television uplink technology developed by Israel’s LiveU. And Orad TV developed the software to display national flags on the lanes for swimming and track events.
http://www.timesofisrael.com/seeing-the-olympics-through-an-israeli-tech-companys-eyes/
http://wiki.answers.com/Q/How_do_the_Olympics_make_the_flag_images_appear_in_the_swimming_pool