Asymmetric Free-Hand Interaction on a Large Display and Inspirations for Designing Natural User Interfaces

Hand motion sensing-based interaction, abbreviated as ‘free-hand interaction’, provides a natural and intuitive method for touch-less interaction on large display. But due to inherent usability deficiencies of the unconventional size display kinematic limitations user’s arm joint movement, display-based free-hand is suspected have different performance across whole areas To verify this, multi-directional target pointing selection experiment was designed conducted based ISO 9241-9 evaluation criteria. Results show that (1) in close center body had higher accuracy than peripheral-body areas; (2) asymmetric at left side right body. More specifically, left-hand left-sided area more efficient accurate right-sided area. For right-hand result converse; moreover, (3) dominant hand generated non-dominant hand. Lessons strategies are discussed designing user-friendly user interfaces displays-based interactive applications.