PPAP: Perspective Projection Augment Platform with Pan-Tilt Actuation for Improved Spatial Perception.

JungHyun Byun,Tack-Don Han

doi:10.3390/s19122652

Abstract

In this paper, we propose PPAP, an augmented reality platform with an actuated projector for dynamic user-perspective projection. In PPAP, a stationary camera is used jointly with a pan–tilt motorized projector-camera unit. With the servo control of the steerable pan–tilt system, the system is able to continuously orient itself to match the user’s view center of the projection-mapped surface. This provides users with greatly widened viewing angles in the augmented scene, when compared to the stationary projection. Through user studies, in which users judged the size and distance of a projected virtual object, we verified that the perspective projection with the actuated projector helps users better understand the spatial relationship of the virtual object in the augmented scene in terms of depth perception.

Highlights

Augmented reality (AR) is in essence the art of superimposing the computer-generated graphics onto the real world, merging both worlds
We focused on examining the effectiveness of increased motion parallax on a user’s sense of the virtual object’s spatial presence in the monoscopic perspective projection AR environment
It is reported that the projection of the virtual content that was far from the surface degraded in quality [34], and it resulted in users’ under-performance in perceiving spatial presence of virtual objects as they were distanced from the surface [27]

Summary

Introduction

Augmented reality (AR) is in essence the art of superimposing the computer-generated graphics onto the real world, merging both worlds. In a VR setup, a user is typically completely cut off from the real world by blocking the non-screen peripheral area of a head-mounted device (HMD). The portion of the real world merged with the virtual world–field of view (FOV), viewing angle or interaction area in other words—heavily affects the quality of experience and sense of immersion. Bimber and Raskar in [1] grouped AR devices or environments into three categories by their display characteristics and locations as (1) head-mounted (head-attached), (2) mobile (hand-held) and (3) spatial AR (SAR). Due to limitations in the display technology and the screen size, the effective FOV that users perceive leave room for much improvement, hindering a fully immersive AR experience

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