4K applications beyond digital cinema

4K that became a digital cinema standard in 2005 is now recognized as the next high quality image technology of HD in the market. This paper describes what 4K is, the status of 4K, and 4K applications other than digital cinema. We introduces three 4K applications, 4K alternative content with live transmission, 4K usage in dome theaters, and 4K video conference with our proof-of-concept experiments over the world.