Reduction of Interaction Space in Single Point Active Alignment Method for Optical See-Through Head-Mounted Display Calibration

With users always involved in the calibration of optical see-through head-mounted displays, the accuracy of calibration is subject to human-related errors, for example, postural sway, an unstable input medium, and fatigue. In this paper we propose a new calibration approach: Fixed-head 2 degree-of-freedom (DOF) interaction for Single Point Active Alignment Method (SPAAM) reduces the interaction space from a typical 6 DOF head motion to a 2 DOF cursor position on the semi-transparent screen. It uses a mouse as input medium, which is more intuitive and stable, and reduces user fatigue by simplifying and speeding up the calibration procedure.A multi-user study confirmed the significant reduction of humanrelated error by comparing our novel fixed-head 2 DOF interaction to the traditional interaction methods for SPAAM.