Improv: An Input Framework for Improvising Cross-Device Interaction by Demonstration.

As computing devices become increasingly ubiquitous, it is now possible to combine the unique capabilities of different devices or Internet of Things to accomplish a task. However, there is currently a high technical barrier for creating cross-device interaction. This is especially challenging for end users who have limited technical expertise—end users would greatly benefit from custom cross-device interaction that best suits their needs. In this article, we present Improv, a cross-device input framework that allows a user to easily leverage the capability of additional devices to create new input methods for an existing, unmodified application, e.g., creating custom gestures on a smartphone to control a desktop presentation application. Instead of requiring developers to anticipate and program these cross-device behaviors in advance, Improv enables end users to improvise them on the fly by simple demonstration, for their particular needs and devices at hand. We showcase a range of scenarios where Improv is used to create a diverse set of useful cross-device input. Our study with 14 participants indicated that on average it took a participant 10 seconds to create a cross-device input technique. In addition, Improv achieved 93.7% accuracy in interpreting user demonstration of a target UI behavior by looking at the raw input events from a single example.