A Study of Depth Visualization Techniques for Virtual Annotations in Augmented Reality Environments

Abstract

It is often difficult to perceive the depth of virtual objects in an augmented reality (AR) environment due to poor depth cues and visual congestion. Existing visualization techniques that address the depth ambiguity problem are intended primarily for normal objects having 3D geometry. In this paper, we discuss depth visualization techniques for virtual annotations. Virtual annotations are used to display key information in AR applications such as navigation and maintenance systems. We begin by describing the depth ambiguity problem with regard to virtual annotations. Next, a number of possible solutions are discussed by introducing a metaphor of monocular vision. Finally, we describe three experiments that reveal the effectiveness and characteristics of the three visualization techniques implemented in the prototype system.