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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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