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标题: C1x6: A Stereoscopic Six-User Display [打印本页]

作者: 晃晃 时间: 2011-12-30 18:59
标题: C1x6: A Stereoscopic Six-User Display
C1x6: A Stereoscopic Six-User Displayfor Co-located Collaboration in Shared Virtual Environments

Alexander Kulik,Andr´ e Kunert,Stephan Beck,Roman Reichel,Roland Blachy,

Armin Zinkz,3 Bernd Froehlich,

Bauhaus-Universit¨ at Weimar Fraunhofer IAO digital IMAGE

Abstract

Stereoscopic multi-user systems provide multiple users with in-

dividual views of a virtual environment. We developed a new

projection-based stereoscopic display for six users, which employs

six customized DLP projectors for fast time-sequential image dis-

play in combination with polarization. Our intelligent high-speed

shutter glasses can be programmed from the application to adapt to

the situation. For instance, it does this by staying open if users do

not look at the projection screen or switch to a VIP high brightness

mode if less than six users use the system. Each user is tracked and

can move freely in front of the display while perceiving perspec-

tively correct views of the virtual environment.

全文请下载附件：

Navigating a group of six users through a virtual world leads to

situations in which the group will not ﬁt through spatial constric-

tions. Our augmented group navigation techniques ameliorate this

situation by fading out obstacles or by slightly redirecting individ-

ual users along a collision-free path. While redirection goes mostly

unnoticed, both techniques temporarily give up the notion of a con-

sistent shared space. Our user study conﬁrms that users generally

prefer this trade-off over na¨ ıve approaches.

CR Categories: B4.2 [INPUT/OUTPUT AND DATA COMMU-

NICATIONS]: Input/Output Devices—Image Display; H5.1 [IN-

FORMATION INTERFACES AND PRESENTATION]: Multime-

dia Information Systems—Artiﬁcial, augmented, and virtual reali-

ties

Keywords: Virtual Reality, Display Technology, Collaboration

1 Introduction

3D television sets and 3D cinemas display only a single stereo-

scopic image stream, and thus there is only a single location from

which a person observes a perspectively correct view of the dis-

played scenes. All of the other spectators perceive the 3D scene

more or less distorted, which inhibits precise spatial perception of

the displayed geometry. While this may not matter much in movie

theaters, these distortions signiﬁcantly hamper the acceptance of

3D technology in many other application areas. In order to com-

pensate for this, each user must be provided with individual stereo-

scopic image pairs, which are rendered for the exact position of

the user in front of a display. While the computing power to gen-

erate multiple views of interactive content is available, the display

technology for presenting large individual stereoscopic images for

multiple users is still lacking

We developed the C1x6, a new projection-based stereoscopic dis-

play for six users (Figure 1). Our system consists of six customized

DLP projectors, each of which projects six fast time-sequential im-

ages in one of the primary colors. By differently polarizing the light

output of the ﬁrst set of three single color projectors (red, green,

blue) than those of the second set, we are able to project twelve

separable full-color images onto a projection screen. Our intelligent

high-speed shutter glasses can be fully controlled from the applica-

tion level. This feature is used to keep the glasses open if users look

away from the screen or for supporting a VIP high brightness mode

if less than six users are involved. We developed the software and

hardware infras***cture to generate, warp and feed the stereoscopic

images for the six tracked users into the projectors.

Multi-user displays enable co-located collaborative work in shared

virtual environments. For collaborative design reviews we devel-

oped the Spheron, an input device which makes interactions trans-

parent to other co-located users. However, when navigating a group

of users through a virtual building, many situations arise in which

there is not enough space to place the users in the virtual world

in the same way as they are positioned relative to each other in

the real world. This problem did not exist in common projection-

based virtual reality systems, where all the observers share the same

perspective as the head-tracked navigator. Therefore, we present

several approaches to facilitate group navigation in such situations

by avoiding collisions of group members with surrounding objects

such as walls and other obstacles.

The main contributions of our work fall into three areas:

• A synchronized DLP projector array that is capable of dis-

playing twelve high resolution (1920x1200) full color image

streams at 360Hz—60Hz per user. Left and right eye images

are simultaneously projected and separated by polarization.

• Application-level programmable shutter glasses consisting of

double-cell liquid crystals that enable intelligent shutter con-

trol and provide fast switching speeds as well as high-contrast.

• Augmented group navigation techniques that avoid collisions

when traveling through narrow spaces. Our user study reveals

that these techniques are preferred over na¨ ıve approaches.

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