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Touché: Enhancing Touch Interaction on Humans, Screens, Liquids, and Everyday Objects ABSTRACT Touché proposes a novel Swept Frequency Capacitive Sensing technique that can not only detect a touch event, but also recognize complex configurations of the human hands and body. Such contextual information significantly enhances touch interaction in a broad range of applications, from conventional touchscreens to unique contexts and materials. For example, in our explorations we add touch and gesture sensitivity to the human body and liquids. We demonstrate the rich capabilities of Touché with five example setups from different application domains and conduct experimental studies that show gesture classification accuracies of 99% are achievable with our technology. Author Keywords: Touch, gestures, ubiquitous interfaces, sensors, on-body computing, mobile devices. ACM Classification Keywords H.5.2 [Information interfaces and presentation]: User Interfaces -Graphical user interfaces; Input devices & strategies. INTRODUCTION Touché is a novel capacitive touch sensing technology that provides rich touch and gesture sensitivity to a variety of analogue and digital objects. The technology is scalable, i.e., the same sensor is equally effective for a pencil, a doorknob, a mobile phone or a table. Gesture recognition also scales with objects: a Touché enhanced doorknob can capture the configuration of fingers touching it, while a table can track the posture of the entire user (Figures 1b, 6 and 7). Sensing with Touché is not limited to inanimate objects – the user’s body can also be made touch and gesture sensitive (Figures 1a and 9). In general, Touché makes it very easy to add touch and gesture interactivity to unusual, nonsolid objects and materials, such as a body of water. Using Touché we can recognize when users touch the water’s surface or dip their fingers into it (Figures 1c and 10). Notably, instrumenting objects, humans and liquids with Touché is trivial: a single...