Information Technology Augmentative and Alternative Communication Using Smart Mobile Devices
Iurii V. Krak, Ruslan Bahrii, Olexander Barmak · Journal of Mobile Multimedia · 2021
The article describes the information technology of alternative communication implemented by non-contact text entry using a limited number of simple dynamic gestures. Non-contact text entry technologies and motion tracking devices are analysed. A model of the human hand is proposed, which provides information on the position of the hand at each moment in time. Parameters sufficient for recognizing static and dynamic gestures are identified. The process of calculating the features of the various components of the movement that occur when showing dynamic hand gestures is considered. Common methods for selecting letters with non-contact text entry are analysed. To implement the user interaction interface, it is proposed to use a radial virtual keyboard with keys containing alphabetical letters grouped. A functional model and a model of human-computer interaction of non-contact text entry have been developed. It enabled to develop an easy-to-use software system for alternative communication, which is implemented by non-contact text entry using hand gestures. The developed software system provides a communication mechanism for people with disabilities.