Uwe Gruenefeld

Uwe Gruenefeld
University of Duisburg-Essen | uni-due · Institut für Informatik und Wirtschaftsinformatik

Dr. rer. nat.

About

64
Publications
23,101
Reads
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384
Citations
Citations since 2016
60 Research Items
380 Citations
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2016201720182019202020212022020406080100120
Introduction
I am a Postdoc Researcher in Human-Computer Interaction at the University of Duisburg-Essen, Germany. I am fascinated by Augmented and Virtual Reality. My research has mainly focused on investigating out-of-view objects, peripheral visualization, and attention guidance.
Additional affiliations
March 2015 - March 2018
Carl von Ossietzky Universität Oldenburg
Position
  • PhD Student

Publications

Publications (64)
Conference Paper
Full-text available
Recent advances in Virtual Reality (VR) technology, such as larger fields of view, have made VR increasingly immersive. However, a larger field of view often results in a user focusing on certain directions and missing relevant content presented elsewhere on the screen. With HiveFive, we propose a technique that uses swarm motion to guide user atte...
Conference Paper
Full-text available
Virtual Reality (VR) is becoming increasingly popular both in the entertainment and professional domains. Behavioral biometrics have recently been investigated as a means to continuously and implicitly identify users in VR. VR applications can specifically benefit from this, for example, to adapt the environment and user interface as well as to aut...
Conference Paper
Full-text available
Cross-reality systems empower users to transition along the reality-virtuality continuum or collaborate with others experiencing different manifestations of it. However, prototyping these systems is challenging, as it requires sophisticated technical skills, time, and often expensive hardware. We present VRception, a concept and toolkit for quick a...
Article
Full-text available
Augmented Reality (AR) technology enables users to superpose virtual content onto their environments. However, interacting with virtual content while mobile often requires users to perform interactions in mid-air, resulting in a lack of haptic feedback. Hence, in this work, we present the ARm Haptics system, which is worn on the user's forearm and...
Article
Nowadays, Augmented and Virtual Reality devices are widely available and are often shared among users due to their high cost. Thus, distinguishing users to offer personalized experiences is essential. However, currently used explicit user authentication (e.g., entering a password) is tedious and vulnerable to attack. Therefore, this work investigat...
Conference Paper
Full-text available
Nowadays, deep learning models enable numerous safety-critical applications, such as biometric authentication, medical diagnosis support, and self-driving cars. However, previous studies have frequently demonstrated that these models are attackable through slight modifications of their inputs, so-called adversarial attacks. Hence, researchers propo...
Conference Paper
Full-text available
Monitoring dietary intake is essential to providing user feedback and achieving a healthier lifestyle. In the past, different approaches for monitoring dietary behavior have been proposed. In this position paper, we first present an overview of the state-of-the-art techniques grouped by image- and sensor-based approaches. After that, we introduce a...
Conference Paper
Full-text available
In Level 3 automated vehicles, preparing drivers for takeover requests (TORs) on the head-up display (HUD) requires their repeated attention. Visually salient HUD elements can distract attention from potentially critical parts in a driving scene during a TOR. Further, attention is (a) meanwhile needed for non-driving-related activities and can (b)...
Poster
Full-text available
With non-Euclidean spaces, Virtual Reality (VR) experiences can more efficiently exploit the available physical space by using overlapping virtual rooms. However, the illusion created by these spaces can be discovered, if the overlap is too large. Thus, in this work, we investigate if users can be distracted from the overlap by showing a minimap th...
Poster
Full-text available
The ongoing Covid-19 pandemic has impacted our everyday lives and demands everyone to take countermeasures such as wearing masks or disinfecting their hands. However, while previous work suggests that these countermeasures may profoundly impact biometric authentication, an investigation of the actual impact is still missing. Hence, in this work, we...
Conference Paper
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In Virtual Reality (VR), Steady-State-Visual Evoked Potentials (SSVEPs) can be used to interact with the virtual environment using brain signals. However, the design of SSVEP-eliciting stimuli often does not match the virtual environment, and thus, disrupts the virtual experience. In this paper, we investigate stimulus designs with varying suitabil...
Conference Paper
Full-text available
Around 466 million people in the world live with hearing loss, with many benefiting from sign language as a mean of communication. Through advancements in technology-supported learning, autodidactic acquisition of sign languages, e.g., American Sign Language (ASL), has become possible. However, little is known about the best practices for teaching...
Conference Paper
We explore how attackers behave during shoulder surfing. Unfortunately, such behavior is challenging to study as it is often opportunistic and can occur wherever potential attackers can observe other people’s private screens. Therefore, we investigate shoulder surfing using virtual reality (VR). We recruited 24 participants and observed their behav...
Article
Full-text available
Nowadays, robots are found in a growing number of areas where they collaborate closely with humans. Enabled by lightweight materials and safety sensors, these cobots are gaining increasing popularity in domestic care, where they support people with physical impairments in their everyday lives. However, when cobots perform actions autonomously, it r...
Conference Paper
Full-text available
Virtual Reality (VR) remote collaboration is becoming more and more relevant in a wide range of scenarios, such as remote assistance or group work. A way to enhance the user experience is using haptic props that make virtual objects graspable. But physical objects are only present in one location and cannot be manipulated directly by remote users....
Conference Paper
Full-text available
Identifying users of a Virtual Reality (VR) headset provides designers of VR content with the opportunity to adapt the user interface, set user-specific preferences, or adjust the level of difficulty either for games or training applications. While most identification methods currently rely on explicit input, implicit user identification is less di...
Conference Paper
Full-text available
Virtual Reality (VR) enables compelling visual experiences. However, providing haptic feedback is still challenging. Previous work suggests utilizing haptic props to overcome such limitations and presents evidence that props could function as a single haptic proxy for several virtual objects. In this work, we displace users’ hands to account for vi...
Conference Paper
Full-text available
Shoulder surfing is an omnipresent risk for smartphone users. However, investigating these attacks in the wild is difficult because of either privacy concerns, lack of consent, or the fact that asking for consent would influence people’s behavior (e.g., they could try to avoid looking at smartphones). Thus, we propose utilizing 360-degree videos in...
Conference Paper
Full-text available
Sketching is a vital step in design processes. While analog sketching on pen and paper is the defacto standard, Virtual Reality (VR) seems promising for improving the sketching experience. It provides myr-iads of new opportunities to express creative ideas. In contrast to reality, possible drawbacks of pen and paper drawing can be tackled by alteri...
Article
Deep Learning has revolutionized Machine Learning, enhancing our ability to solve complex computational problems. From image classification to speech recognition, the technology can be beneficial in a broad range of scenarios. However, the barrier to entry is quite high, especially when programming skills are missing. In this paper, we present the...
Conference Paper
Full-text available
Manual assembly tasks require workers to precisely assemble parts in 3D space. Often additional time pressure increases the complexity of these tasks even further (e.g., adhesive bonding processes). Therefore, we investigate how Augmented Reality (AR) can improve workers' performance in time and spatial dependent process steps. In a user study, we...
Conference Paper
Full-text available
Locating objects in the environment can be a difficult task, especially when the objects are occluded. With Augmented Reality, we can alternate our perceived reality by augmenting it with visual cues or removing visual elements of reality, helping users to locate occluded objects. However, to our knowledge, it has not yet been evaluated which visua...
Conference Paper
Full-text available
Over the last years, Augmented and Virtual Reality technology became more immersive. However, when users immerse themselves in these digital realities, they detach from their real-world environments. This detachment creates conflicts that are problematic in public spaces such as planes but also private settings. Consequently, on the one hand, the d...
Conference Paper
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One of the main benefits of interactive Virtual Reality (VR) applications is that they provide a high sense of immersion. As a result, users lose their sense of real-world space which makes them vulnerable to collisions with real-world objects. In this work, we propose a novel approach to prevent such collisions using Electrical Muscle Stimulation...
Poster
Full-text available
Brain-Computer Interfaces (BCIs) are progressively adopted by the consumer market, making them available for a variety of use-cases. However, off-the-shelf BCIs are limited in their adjustments towards individual head shapes, evaluation of scalp-electrode contact, and extension through additional sensors. This work presents EasyEG, a BCI headset th...
Conference Paper
Full-text available
Established safety sensor technology shuts down industrial robots when a collision is detected, causing preventable loss of productivity. To minimize downtime, we implemented three Augmented Reality (AR) visualizations (Path, Preview, and Volume) which allow users to understand robot motion intent and give way to the robot. We compare the different...
Conference Paper
Full-text available
Deep learning has revolutionized machine learning, enhancing our ability to solve complex computational problems. From image classification to speech recognition, the technology can be beneficial in a broad range of scenarios. However, the barrier to entry is quite high, especially when programming skills are missing. In this paper, we present the...
Thesis
Full-text available
In the past decade, Mixed Reality has emerged as a promising technology for supporting users with everyday tasks. It allows one to alter perceived reality by blending it with virtual content. Mixed Reality can thus be used to overlay perceived reality with visual cues that empower users to locate relevant objects in the environment, regardless of w...
Conference Paper
Full-text available
Locating objects in physical environments can be an exhausting and frustrating task, particularly when these objects are out of the user's view or occluded by other objects. With recent advances in Augmented Reality (AR), these environments can be augmented to visualize objects for which the user searches. However, it is currently unclear which vis...
Conference Paper
Full-text available
As a third party to both automated and non-automated vehicles , pedestrians are among the most vulnerable participants in traffic. Currently, there is no way for them to communicate their intentions to an automated vehicle (AV). In this work, we explore the interactions between pedestrians and AVs at unmarked crossings. We propose a virtual reality...
Conference Paper
Full-text available
Locating virtual objects (e.g., holograms) in head-mounted Augmented Reality (AR) can be an exhausting and frustrating task. This is mostly due to the limited field of view of current AR devices, which amplify the problem of objects receding from view. In previous work, EyeSee360 was developed to address this problem by visualizing the locations of...
Conference Paper
Full-text available
Augmented Reality (AR) devices and applications are gaining in popularity, and-with recent trends such as Pokemon Go-are venturing into public spaces where they become more and more pervasive. In consequence, public AR displays might soon be part of our cityscapes and may impact on our everyday view of the world. In this work, we present ChalkboARd...
Conference Paper
Full-text available
Current head-mounted displays (HMDs) have a limited field-of-view (FOV). A limited FOV further decreases the already restricted human visual range and amplifies the problem of objects receding from view (e.g., opponents in computer games). However, there is no previous work that investigates how to best perceive moving out-of-view objects on head-m...
Article
Full-text available
Developing new software components for ship bridges is challenging. Mostly due to high costs of testing these components in realistic environments. To reduce these costs the development process is divided into different stages. Whereas, the final test on a real ship bridge is the last step in this process. However, by dividing the development proce...
Conference Paper
Full-text available
Although the mobility and emerging technology of augmented reality (AR) have brought significant entertainment and convenience in everyday life, the use of AR is becoming a social problem as the accidents caused by a shortage of situation awareness due to an immersion of AR are increasing. In this paper, we address the trade-off between immersion a...
Poster
Full-text available
Learning new motor skills is a problem that people are constantly confronted with (e.g. to learn a new kind of sport). In our work, we investigate to which extent the learning process of a motor sequence can be optimized with the help of Augmented Reality as a technical assistant. Therefore, we propose an approach that divides the problem into thre...
Poster
Full-text available
Current Virtual Reality (VR) devices have limited fields-of-view (FOV). A limited FOV amplifies the problem of objects receding from view. In previous work, different techniques have been proposed to visualize the position of objects out of view. However, these techniques do not allow to identify these objects. In this work, we compare three differ...
Conference Paper
Full-text available
Over the past few years, playing Augmented Reality (AR) games on smartphones has steadily been gaining in popularity (e.g., Pokémon Go). However, playing these games while navigating traffic is highly dangerous and has led to many accidents in the past. In our work, we aim to augment peripheral vision of pedestrians with low-cost glasses to support...
Article
Full-text available
In recent years, container ships have had to transport more and more goods due to constantly growing demand. Therefore, the container ships for carrying these goods are growing in size, while the harbors fall short in adapting to these changes. As a result, the berthing of these container ships in harbors has become more challenging for harbor pilo...
Conference Paper
Full-text available
Knowing the locations of spatially distributed objects is important in many different scenarios (e.g., driving a car and being aware of other road users). In particular, it is critical for preventing accidents with objects that come too close (e.g., cyclists or pedestrians). In this paper, we explore how peripheral cues can shift a user's attention...
Conference Paper
Full-text available
Head-mounted devices (HMDs) for Virtual and Augmented Reality (VR/AR) enable us to alter our visual perception of the world. However, current devices suffer from a limited field of view (FOV), which becomes problematic when users need to locate out of view objects (e.g., locating points-of-interest during sightseeing). To address this, we developed...
Conference Paper
Full-text available
Current head-mounted displays (HMDs) for Virtual Reality (VR) and Augmented Reality (AR) have a limited field-of-view (FOV). This limited FOV further decreases the already restricted human visual range and amplifies the problem of objects going out of view. Therefore, we explore the utility of augmenting HMDs with RadialLight, a peripheral light di...
Poster
Full-text available
Present head-mounted displays (HMDs) for Augmented Reality (AR) devices have narrow fields-of-view (FOV). The narrow FOV further decreases the already limited human visual range and worsens the problem of objects going out of view. Therefore, we explore the utility of augmenting head-mounted AR devices with MonoculAR, a peripheral light display com...
Conference Paper
Full-text available
Virtual Reality (VR) technology empowers users to experience and manipulate virtual environments in a novel way. Further, by using digital twins of real world objects it is also possible to extend the reach of interaction to reality. In this work, we explore how users interact with a robot arm and its programming by using a digital representation i...
Presentation
Full-text available
Today’s Augmented Reality (AR) devices enable users to interact almost naturally with their surroundings, e.g., by pinning digital content onto real-world objects. However, current AR display are mostly limited to optical and video see-through technologies. Nevertheless, extending Augmented Reality (AR) beyond screens by accommodating additional mo...
Conference Paper
Full-text available
Virtual Reality (VR) devices empower users to be fully immersed into a virtual environment. In an enclosed environment such as this, notifications indicating risks (e.g., risk of injury when bumping into walls) must be perceived as quickly and correctly as possible. Different to findings from previous work using displays to investigate fast respons...
Poster
Full-text available
Mixed Reality devices can either augment reality (AR) or create completely virtual realities (VR). Combined with head-mounted devices and eye-tracking, they enable users to interact with these systems in novel ways. However, current eye-tracking systems are expensive and limited in the interaction with virtual content. In this paper, we present Eye...
Conference Paper
Full-text available
Augmented Reality (AR) devices empower users to enrich their surroundings by pinning digital content onto real world objects. However, current AR devices suffer from having small fields of view, making the process of locating spatially distributed digital content similar to looking through a keyhole. Previous solutions are not suitable to address t...
Conference Paper
Full-text available
For decision making in monitoring and control rooms situation awareness is key. Given the often spacious and complex environments, simple alarms are not sufficient for attention guidance (e.g., on ship bridges). In our work, we explore shifting attention towards the location of relevant entities in large cyber-physical systems. Therefore, we used p...
Poster
Full-text available
Recent advances in Virtual and Augmented Reality technology enable a variety of new applications (e.g., multi-player games in real environments). However, current devices suffer from having small fields of view, making the process of locating spatially distributed digital content similar to looking through a keyhole. In this work, we present EyeSee...
Conference Paper
Full-text available
Head-mounted displays allow user to augment reality or dive into a virtual one. However, these 3D spaces often come with problems due to objects that may be out of view. Visualizing these out-of-view objects is useful under certain scenarios, such as situation monitoring during ship docking. To address this, we designed a lo-fi prototype of our Eye...
Poster
Full-text available
Head-mounted Augmented Reality (AR) devices allow overlaying digital information on the real world, where objects may be out of view. Visualizing these out-of-view objects is useful under certain scenarios. To address this, we developed EyeSee360[1] in our previous work. However, our implementation of EyeSee360 was limited to video-see-through devi...
Conference Paper
Full-text available
While performing multiple competing tasks at the same time, e.g., when driving, assistant systems can be used to create cues to direct attention towards required information. However, poorly designed cues will interrupt or annoy users and affect their performance. Therefore, we aim to identify cues that are not missed and trigger a quick reaction w...
Poster
Full-text available
Various off-screen visualization techniques that point to off-screen objects have been developed for small screen devices. A similar problem arises with head-mounted Augmented Reality (AR) with respect to the human field-of-view, where objects may be out of view. Being able to detect so-called out-of-view objects is useful for certain scenarios (e....
Poster
Full-text available
Nowadays, Mixed and Virtual Reality devices suffer from a field of view that is too small compared to human visual perception. Although a larger field of view is useful (e.g., conveying peripheral information or improving situation awareness), technical limitations prevent the extension of the field-of-view. A way to overcome these limitations is t...
Thesis
Full-text available
Regional search is a specialized branch of geographic search, which allows users to find relevant geographic regions that fit multiple spatial criteria of interest. Regional search can be a significant phenomenon in various real time decision making scenarios, e.g., finding the most affected region by Ebola-epidemic virus, in field of renewable ene...
Conference Paper
Full-text available
People moving to a new place usually look for a suit-able region with respect to their multiple criteria of interests. In this work we map this problem to the migration behavior of other species such as swarming, which is a collective behavior exhibited by animals of similar size which aggregate together, milling about the same region. Taking the s...

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