All in-text references underlined in blue are linked to publications on ResearchGate, letting you... more All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
Perspective projection in combination with head tracking is widely used in immersive virtual envi... more Perspective projection in combination with head tracking is widely used in immersive virtual environments to support users with correct spatial perception of the virtual world. However, most projection based
Abstract. Clusters of commodity PCs are widely considered as the way to go to improve rendering p... more Abstract. Clusters of commodity PCs are widely considered as the way to go to improve rendering performance and quality in many real-time rendering applications. We describe the design and implementation of our parallel rendering system for real-time rendering applications. Major design objectives for our system are: usage of commodity hardware for all system components, ease of integration into existing Virtual Environments software, and flexibility in applying different rendering techniques, e.g.
Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physi... more Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance. J Appl Physiol 110: 1432-1438. First published March 17, 2011 doi:10.1152/japplphysiol.00165.2011.-Many people spend an increasing amount of time in front of computer screens equipped with light-emitting diodes (LED) with a short wavelength (blue range). Thus we investigated the repercussions on melatonin (a marker of the circadian clock), alertness, and cognitive performance levels in 13 young male volunteers under controlled laboratory conditions in a balanced crossover design. A 5-h evening exposure to a white LEDbacklit screen with more than twice as much 464 nm light emission {irradiance of 0,241 Watt/(steradian ϫ m 2 ) [W/(sr ϫ m 2 )], 2.1 ϫ 10 13 photons/(cm 2 ϫ s), in the wavelength range of 454 and 474 nm} than a white non-LED-backlit screen [irradiance of 0,099 W/(sr ϫ m 2 ), 0.7 ϫ 10 13 photons/(cm 2 ϫ s), in the wavelength range of 454 and 474...
Graphiksystem fur Anwendungen der virtuellen Realitat zur Erzeugung und Darstellung einer Vielzah... more Graphiksystem fur Anwendungen der virtuellen Realitat zur Erzeugung und Darstellung einer Vielzahl von Ansichten, die gemeinsam einen Szenegraphen darstellen, mit mindestens einem Sensor zur Erfassung von Positionen, Orientierungen und/oder Bewegungen und Erzeugung von Sensordaten, mindestens einer Ausgabevorrichtung zur Darstellung der Vielzahl von Ansichten, einem ersten Computer und mindestens einem weiteren Computer, zur Erzeugung jeweils mindestens einer Ansicht, die diesem zugeordnet ist, wobei jeder Computer Mittel enthalt zur Erzeugung der ihm zugeordneten Ansicht aus dem Szenegraphen, einer ersten Ubertragungsvorrichtung zur Ubertragung der Sensordaten von dem Sensor zu dem ersten Computer sowie mit einer zweiten Ubertragungsvorrichtung zur Ubertragung der erzeugten Ansichten aus jedem Computer zu der Ausgabevorrichtung, dadurch gekennzeichnet, das eine dritte Ubertragungsvorrichtung zur Ubertragung der Sensordaten von dem ersten Computer zu jedem weiteren Computer v orgese...
Die Erfindung betrifft eine Projektionsanordnung mit einer Mehrzahl von Projektoren (P1L, P1R, Pn... more Die Erfindung betrifft eine Projektionsanordnung mit einer Mehrzahl von Projektoren (P1L, P1R, PnL, PnR), die jeweils eine schaltbare Lichtquelle (L1L, L1R, LnL, LnR) aufweisen, und einer Steuereinheit (2), die dazu eingerichtet ist, eine Mehrzahl von Shuttern (SL1, SR1, SLm, SRm) zeitlich versetzt zueinander zwischen einem durchlassigen und einem undurchlassigen Zustand umzuschalten. Dadurch, dass die Steuereinheit (2) dazu ausgebildet ist, die Lichtquellen (L1L, L1R, LnL, LnR) der Projektoren (P1L, P1R, PnL, PnR) jeweils zeitlich korreliert mit mindestens einem der Shutter (SL1, SR1, SLm, SRm), der dem jeweiligen Projektor (P1L, P1R, PnL, PnR) zugordnet ist, an- und auszuschalten, wird eine deutliche Energieerspaarnis erreicht, wobei zugleich ein Ubersprechen zwischen den verschiedenen durch die Projektoren projizierten Bildinhalten verringert wird.
Die im Rahmen des Projekts GLASSROOM entstandene VR-Applikation wurde in zwei Nutzertests in ihre... more Die im Rahmen des Projekts GLASSROOM entstandene VR-Applikation wurde in zwei Nutzertests in ihrem jeweils aktuellen Entwicklungsstand evaluiert. Die Applikation wurde mit Hilfe der in den Tests erlangten Ergebnisse und Erfahrungen weiterentwickelt. In diesem Beitrag wird die Durchfuhrung der Evaluationen beschrieben; naher betrachtet werden dabei insb. die jeweiligen Entwicklungsstande, die Auswahl der jeweiligen Lerninhalte sowie die eingesetzten technischen Mittel.
Proceedings of the 2017 ACM International Conference on Interactive Surfaces and Spaces
We describe ProDesk, an ubiquitous, projection-based touch surface system that extends the screen... more We describe ProDesk, an ubiquitous, projection-based touch surface system that extends the screen space of today's desktop computer workplaces to the whole surface of an ordinary office desk, along with highly accurate multi-touch interaction. The objective of this system is to offer users more flexibility on tasks in which lots of complex information have to be handled. We propose a novel user interface concept that extends normal WIMP functionality and a software architecture that implements this UI concept. We present evaluation results of the system in technical benchmarks and a user study.
The goal of this study is to determine how a self-avatar in virtual reality, experienced from dif... more The goal of this study is to determine how a self-avatar in virtual reality, experienced from different viewpoints on the body (at eyeor chest-height), might influence body part localization, as well as self-localization within the body. Previous literature shows that people do not locate themselves in only one location, but rather primarily in the face and the upper torso. Therefore, we aimed to determine if manipulating the viewpoint to either the height of the eyes or to the height of the chest would influence self-location estimates towards these commonly identified locations of self. In a virtual reality (VR) headset, participants were asked to point at several of their body parts (body part localization) as well as "directly at you" (self-localization) with a virtual pointer. Both pointing tasks were performed before and after a self-avatar adaptation phase where participants explored a co-located, scaled, gender-matched, and animated self-avatar. We hypothesized that experiencing a self-avatar might reduce inaccuracies in body part localization, and that viewpoint would influence pointing responses for both body part and self-localization. Participants overall pointed relatively accurately to some of their body parts (shoulders, chin, and eyes), but very inaccurately to others, with large undershooting for the hips, knees, and feet, and large overshooting for the top of the head. Self-localization was spread across the body (as well as above the * Corresponding author.
Comfort is an important factor in the acceptance of transport systems. In 2010 and 2011, the Euro... more Comfort is an important factor in the acceptance of transport systems. In 2010 and 2011, the European Commission (EC) put forward its vision for air travel in the year 2050 which envisaged the use of in-flight virtual reality. This paper addressed the EC vision by investigating the effect of virtual environments on comfort. Research has shown that virtual environments can provide entertaining experiences and can be effective distracters from painful experiences. To determine the extent to which a virtual environment could distract people from sources of discomfort. Experiments which involved inducing discomfort commonly experienced in-flight (e.g. limited space, noise) in order to determine the extent to which viewing a virtual environment could distract people from discomfort. Virtual environments can fully or partially distract people from sources of discomfort, becoming more effective when they are interesting. They are also more effective at distracting people from discomfort ca...
All in-text references underlined in blue are linked to publications on ResearchGate, letting you... more All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
Perspective projection in combination with head tracking is widely used in immersive virtual envi... more Perspective projection in combination with head tracking is widely used in immersive virtual environments to support users with correct spatial perception of the virtual world. However, most projection based
Abstract. Clusters of commodity PCs are widely considered as the way to go to improve rendering p... more Abstract. Clusters of commodity PCs are widely considered as the way to go to improve rendering performance and quality in many real-time rendering applications. We describe the design and implementation of our parallel rendering system for real-time rendering applications. Major design objectives for our system are: usage of commodity hardware for all system components, ease of integration into existing Virtual Environments software, and flexibility in applying different rendering techniques, e.g.
Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physi... more Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance. J Appl Physiol 110: 1432-1438. First published March 17, 2011 doi:10.1152/japplphysiol.00165.2011.-Many people spend an increasing amount of time in front of computer screens equipped with light-emitting diodes (LED) with a short wavelength (blue range). Thus we investigated the repercussions on melatonin (a marker of the circadian clock), alertness, and cognitive performance levels in 13 young male volunteers under controlled laboratory conditions in a balanced crossover design. A 5-h evening exposure to a white LEDbacklit screen with more than twice as much 464 nm light emission {irradiance of 0,241 Watt/(steradian ϫ m 2 ) [W/(sr ϫ m 2 )], 2.1 ϫ 10 13 photons/(cm 2 ϫ s), in the wavelength range of 454 and 474 nm} than a white non-LED-backlit screen [irradiance of 0,099 W/(sr ϫ m 2 ), 0.7 ϫ 10 13 photons/(cm 2 ϫ s), in the wavelength range of 454 and 474...
Graphiksystem fur Anwendungen der virtuellen Realitat zur Erzeugung und Darstellung einer Vielzah... more Graphiksystem fur Anwendungen der virtuellen Realitat zur Erzeugung und Darstellung einer Vielzahl von Ansichten, die gemeinsam einen Szenegraphen darstellen, mit mindestens einem Sensor zur Erfassung von Positionen, Orientierungen und/oder Bewegungen und Erzeugung von Sensordaten, mindestens einer Ausgabevorrichtung zur Darstellung der Vielzahl von Ansichten, einem ersten Computer und mindestens einem weiteren Computer, zur Erzeugung jeweils mindestens einer Ansicht, die diesem zugeordnet ist, wobei jeder Computer Mittel enthalt zur Erzeugung der ihm zugeordneten Ansicht aus dem Szenegraphen, einer ersten Ubertragungsvorrichtung zur Ubertragung der Sensordaten von dem Sensor zu dem ersten Computer sowie mit einer zweiten Ubertragungsvorrichtung zur Ubertragung der erzeugten Ansichten aus jedem Computer zu der Ausgabevorrichtung, dadurch gekennzeichnet, das eine dritte Ubertragungsvorrichtung zur Ubertragung der Sensordaten von dem ersten Computer zu jedem weiteren Computer v orgese...
Die Erfindung betrifft eine Projektionsanordnung mit einer Mehrzahl von Projektoren (P1L, P1R, Pn... more Die Erfindung betrifft eine Projektionsanordnung mit einer Mehrzahl von Projektoren (P1L, P1R, PnL, PnR), die jeweils eine schaltbare Lichtquelle (L1L, L1R, LnL, LnR) aufweisen, und einer Steuereinheit (2), die dazu eingerichtet ist, eine Mehrzahl von Shuttern (SL1, SR1, SLm, SRm) zeitlich versetzt zueinander zwischen einem durchlassigen und einem undurchlassigen Zustand umzuschalten. Dadurch, dass die Steuereinheit (2) dazu ausgebildet ist, die Lichtquellen (L1L, L1R, LnL, LnR) der Projektoren (P1L, P1R, PnL, PnR) jeweils zeitlich korreliert mit mindestens einem der Shutter (SL1, SR1, SLm, SRm), der dem jeweiligen Projektor (P1L, P1R, PnL, PnR) zugordnet ist, an- und auszuschalten, wird eine deutliche Energieerspaarnis erreicht, wobei zugleich ein Ubersprechen zwischen den verschiedenen durch die Projektoren projizierten Bildinhalten verringert wird.
Die im Rahmen des Projekts GLASSROOM entstandene VR-Applikation wurde in zwei Nutzertests in ihre... more Die im Rahmen des Projekts GLASSROOM entstandene VR-Applikation wurde in zwei Nutzertests in ihrem jeweils aktuellen Entwicklungsstand evaluiert. Die Applikation wurde mit Hilfe der in den Tests erlangten Ergebnisse und Erfahrungen weiterentwickelt. In diesem Beitrag wird die Durchfuhrung der Evaluationen beschrieben; naher betrachtet werden dabei insb. die jeweiligen Entwicklungsstande, die Auswahl der jeweiligen Lerninhalte sowie die eingesetzten technischen Mittel.
Proceedings of the 2017 ACM International Conference on Interactive Surfaces and Spaces
We describe ProDesk, an ubiquitous, projection-based touch surface system that extends the screen... more We describe ProDesk, an ubiquitous, projection-based touch surface system that extends the screen space of today's desktop computer workplaces to the whole surface of an ordinary office desk, along with highly accurate multi-touch interaction. The objective of this system is to offer users more flexibility on tasks in which lots of complex information have to be handled. We propose a novel user interface concept that extends normal WIMP functionality and a software architecture that implements this UI concept. We present evaluation results of the system in technical benchmarks and a user study.
The goal of this study is to determine how a self-avatar in virtual reality, experienced from dif... more The goal of this study is to determine how a self-avatar in virtual reality, experienced from different viewpoints on the body (at eyeor chest-height), might influence body part localization, as well as self-localization within the body. Previous literature shows that people do not locate themselves in only one location, but rather primarily in the face and the upper torso. Therefore, we aimed to determine if manipulating the viewpoint to either the height of the eyes or to the height of the chest would influence self-location estimates towards these commonly identified locations of self. In a virtual reality (VR) headset, participants were asked to point at several of their body parts (body part localization) as well as "directly at you" (self-localization) with a virtual pointer. Both pointing tasks were performed before and after a self-avatar adaptation phase where participants explored a co-located, scaled, gender-matched, and animated self-avatar. We hypothesized that experiencing a self-avatar might reduce inaccuracies in body part localization, and that viewpoint would influence pointing responses for both body part and self-localization. Participants overall pointed relatively accurately to some of their body parts (shoulders, chin, and eyes), but very inaccurately to others, with large undershooting for the hips, knees, and feet, and large overshooting for the top of the head. Self-localization was spread across the body (as well as above the * Corresponding author.
Comfort is an important factor in the acceptance of transport systems. In 2010 and 2011, the Euro... more Comfort is an important factor in the acceptance of transport systems. In 2010 and 2011, the European Commission (EC) put forward its vision for air travel in the year 2050 which envisaged the use of in-flight virtual reality. This paper addressed the EC vision by investigating the effect of virtual environments on comfort. Research has shown that virtual environments can provide entertaining experiences and can be effective distracters from painful experiences. To determine the extent to which a virtual environment could distract people from sources of discomfort. Experiments which involved inducing discomfort commonly experienced in-flight (e.g. limited space, noise) in order to determine the extent to which viewing a virtual environment could distract people from discomfort. Virtual environments can fully or partially distract people from sources of discomfort, becoming more effective when they are interesting. They are also more effective at distracting people from discomfort ca...
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