Comparison Among Ambiguous Virtual Keyboards For People With Severe Motor Disabilities

Abstract

This paper presents an exhaustive study on the different topologies of ambiguous soft keyboards, analyzing the text entry average time per character and the average number of user inputs necessary for its creation. Various topologies and design criteria are investigated. In addition, an analytical model is also proposed. This model allows one to compare among different topologies and estimate the sensitivity that different keyboards offer when compared with dictionary hit rates. It has been found that ambiguous keyboards, with six keys, are better to use