G3: bootstrapping stroke gestures design with synthetic samples and built-in recognizers

Stroke gestures are becoming increasingly important with the ongoing success of touchscreen-capable devices. However, training a high-quality gesture recognizer requires providing a large number of examples to enable good performance on unseen, future data. Furthermore, recruiting participants, data collection and labeling, etc. necessary for achieving this goal are usually time-consuming and expensive. In response to this need, we introduce G3, a mobile-first web application for bootstrapping unistroke, multistroke, or multitouch gestures. The user only has to provide a gesture example once, and G3 will create a kinematic model of that gesture. Then, by introducing local and global perturbations to the model parameters, G3 will generate any number of synthetic human-like samples. In addition, the user can get a gesture recognizer together with the synthesized data. As such, the outcome of G3 can be directly incorporated into production-ready applications.