2011 Volume 28 Issue 2 Pages 2_55-2_62
Multi-touch interfaces are getting popular for touch-panel based user interface. While traditional singletouch interface allows to point to only one location on a display, multi-touch interface allows various interactions and thus it is mainly introdcued to mobile devices that have strong limitations on its size and weight. This paper reports on the historical researches of multi-touch and recent research trends beyond positional touch interaction.