scholarly journals Colour Calibration of a Head Mounted Display for Colour Vision Research Using Virtual Reality

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Raquel Gil Rodríguez ◽  
Florian Bayer ◽  
Matteo Toscani ◽  
Dar’ya Guarnera ◽  
Giuseppe Claudio Guarnera ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Real World ◽  
Vision Research ◽  
Colour Vision ◽  
Software Implementation ◽  
Field Of View ◽  
Large Field ◽  
Colour Constancy ◽  
Head Mounted Display ◽  
Colour Appearance

AbstractVirtual reality (VR) technology offers vision researchers the opportunity to conduct immersive studies in simulated real-world scenes. However, an accurate colour calibration of the VR head mounted display (HMD), both in terms of luminance and chromaticity, is required to precisely control the presented stimuli. Such a calibration presents significant new challenges, for example, due to the large field of view of the HMD, or the software implementation used for scene rendering, which might alter the colour appearance of objects. Here, we propose a framework for calibrating an HMD using an imaging colorimeter, the I29 (Radiant Vision Systems, Redmond, WA, USA). We examine two scenarios, both with and without using a rendering software for visualisation. In addition, we present a colour constancy experiment design for VR through a gaming engine software, Unreal Engine 4. The colours of the objects of study are chosen according to the previously defined calibration. Results show a high-colour constancy performance among participants, in agreement with recent studies performed on real-world scenarios. Our studies show that our methodology allows us to control and measure the colours presented in the HMD, effectively enabling the use of VR technology for colour vision research.

Virtual Reality Head-Mounted Display with Large Field of View Based on Stitching

2019 ◽  
Vol 39 (6) ◽  
pp. 0612002 ◽  
Author(s):  
陆驰豪 Chihao Lu ◽  
李海峰 Haifeng Li ◽  
高涛 Tao Gao ◽  
徐良 Liang Xu ◽  
李海丽 Haili Li
Keyword(s):  
Virtual Reality ◽  
Field Of View ◽  
Large Field ◽  
Head Mounted Display

The Shared View Paradigm in Asymmetric Virtual Reality Setups

i-com ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 87-101
Author(s):  
Robin Horst ◽  
Fabio Klonowski ◽  
Linda Rau ◽  
Ralf Dörner
Keyword(s):  
Virtual Reality ◽  
Virtual Environments ◽  
Real World ◽  
User Study ◽  
Field Of View ◽  
Virtual Scene ◽  
Head Mounted Display ◽  
Safety Aspects ◽  
Common Technique ◽  
Visualization Techniques

AbstractAsymmetric Virtual Reality (VR) applications are a substantial subclass of multi-user VR that offers not all participants the same interaction possibilities with the virtual scene. While one user might be immersed using a VR head-mounted display (HMD), another user might experience the VR through a common desktop PC. In an educational scenario, for example, learners can use immersive VR technology to inform themselves at different exhibits within a virtual scene. Educators can use a desktop PC setup for following and guiding learners through virtual exhibits and still being able to pay attention to safety aspects in the real world (e. g., avoid learners bumping against a wall). In such scenarios, educators must ensure that learners have explored the entire scene and have been informed about all virtual exhibits in it. According visualization techniques can support educators and facilitate conducting such VR-enhanced lessons. One common technique is to render the view of the learners on the 2D screen available to the educators. We refer to this solution as the shared view paradigm. However, this straightforward visualization involves challenges. For example, educators have no control over the scene and the collaboration of the learning scenario can be tedious. In this paper, we differentiate between two classes of visualizations that can help educators in asymmetric VR setups. First, we investigate five techniques that visualize the view direction or field of view of users (view visualizations) within virtual environments. Second, we propose three techniques that can support educators to understand what parts of the scene learners already have explored (exploration visualization). In a user study, we show that our participants preferred a volume-based rendering and a view-in-view overlay solution for view visualizations. Furthermore, we show that our participants tended to use combinations of different view visualizations.

How Much of What We Learn in Virtual Reality Transfers to Real-World Navigation?

2020 ◽  
Vol 33 (4-5) ◽  
pp. 479-503 ◽  
Author(s):  
Lukas Hejtmanek ◽  
Michael Starrett ◽  
Emilio Ferrer ◽  
Arne D. Ekstrom
Keyword(s):  
Virtual Reality ◽  
Real World ◽  
Information Transfer ◽  
Spatial Knowledge ◽  
Desktop Computer ◽  
The Real ◽  
Head Mounted Display ◽  
Spatial Environment ◽  
The Cost ◽  
Study Participants

Abstract Past studies suggest that learning a spatial environment by navigating on a desktop computer can lead to significant acquisition of spatial knowledge, although typically less than navigating in the real world. Exactly how this might differ when learning in immersive virtual interfaces that offer a rich set of multisensory cues remains to be fully explored. In this study, participants learned a campus building environment by navigating (1) the real-world version, (2) an immersive version involving an omnidirectional treadmill and head-mounted display, or (3) a version navigated on a desktop computer with a mouse and a keyboard. Participants first navigated the building in one of the three different interfaces and, afterward, navigated the real-world building to assess information transfer. To determine how well they learned the spatial layout, we measured path length, visitation errors, and pointing errors. Both virtual conditions resulted in significant learning and transfer to the real world, suggesting their efficacy in mimicking some aspects of real-world navigation. Overall, real-world navigation outperformed both immersive and desktop navigation, effects particularly pronounced early in learning. This was also suggested in a second experiment involving transfer from the real world to immersive virtual reality (VR). Analysis of effect sizes of going from virtual conditions to the real world suggested a slight advantage for immersive VR compared to desktop in terms of transfer, although at the cost of increased likelihood of dropout. Our findings suggest that virtual navigation results in significant learning, regardless of the interface, with immersive VR providing some advantage when transferring to the real world.

Design of an optical see-through head-mounted display with a low f-number and large field of view using a freeform prism

2009 ◽  
Vol 48 (14) ◽  
pp. 2655 ◽  
Author(s):  
Dewen Cheng ◽  
Yongtian Wang ◽  
Hong Hua ◽  
M. M. Talha
Keyword(s):  
Field Of View ◽  
Large Field ◽  
Head Mounted Display

scholarly journals The Accuracy and Precision of Position and Orientation Tracking in the HTC Vive Virtual Reality System for Scientific Research

i-Perception ◽  
2017 ◽  
Vol 8 (3) ◽  
pp. 204166951770820 ◽  
Author(s):  
Diederick C. Niehorster ◽  
Li Li ◽  
Markus Lappe
Keyword(s):  
Virtual Reality ◽  
Visual Stimulation ◽  
Tracking System ◽  
Ground Plane ◽  
Calibration Procedure ◽  
Large Field ◽  
Head Mounted Display ◽  
Accuracy And Precision ◽  
Time Calibration ◽  
Position And Orientation

The advent of inexpensive consumer virtual reality equipment enables many more researchers to study perception with naturally moving observers. One such system, the HTC Vive, offers a large field-of-view, high-resolution head mounted display together with a room-scale tracking system for less than a thousand U.S. dollars. If the position and orientation tracking of this system is of sufficient accuracy and precision, it could be suitable for much research that is currently done with far more expensive systems. Here we present a quantitative test of the HTC Vive’s position and orientation tracking as well as its end-to-end system latency. We report that while the precision of the Vive’s tracking measurements is high and its system latency (22 ms) is low, its position and orientation measurements are provided in a coordinate system that is tilted with respect to the physical ground plane. Because large changes in offset were found whenever tracking was briefly lost, it cannot be corrected for with a one-time calibration procedure. We conclude that the varying offset between the virtual and the physical tracking space makes the HTC Vive at present unsuitable for scientific experiments that require accurate visual stimulation of self-motion through a virtual world. It may however be suited for other experiments that do not have this requirement.

scholarly journals Assessment of OLED Head Mounted Display for Vision Research with Virtual Reality

2019 ◽  
Author(s):  
Matteo Toscani ◽  
Raquel Gil ◽  
Darya Guarnera ◽  
GiuseppeClaudio Guarnera ◽  
Assim Kalouaz ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Vision Research ◽  
Head Mounted Display

scholarly journals Efficient Live and On-Demand Tiled HEVC 360 VR Video Streaming

2019 ◽  
Vol 13 (03) ◽  
pp. 367-391
Author(s):  
Mattis Jeppsson ◽  
Håvard N. Espeland ◽  
Tomas Kupka ◽  
Ragnar Langseth ◽  
Andreas Petlund ◽  
...  
Keyword(s):  
Real World ◽  
Video Quality ◽  
Field Of View ◽  
Live Streaming ◽  
User Experiences ◽  
Head Mounted Display ◽  
On Demand ◽  
Set Top Box ◽  
Trade Offs ◽  
Bandwidth Savings

360∘ panorama video displayed through Virtual Reality (VR) glasses or large screens offers immersive user experiences, but as such technology becomes commonplace, the need for efficient streaming methods of such high-bitrate videos arises. In this respect, the attention that 360∘ panorama video has received lately is huge. Many methods have already been proposed, and in this paper, we shed more light on the different trade-offs in order to save bandwidth while preserving the video quality in the user’s field-of-view (FoV). Using 360∘ VR content delivered to a Gear VR head-mounted display with a Samsung Galaxy S7 and to a Huawei Q22 set-top-box, we have tested various tiling schemes analyzing the tile layout, the tiling and encoding overheads, mechanisms for faster quality switching beyond the DASH segment boundaries and quality selection configurations. In this paper, we present an efficient end-to-end design and real-world implementation of such a 360∘ streaming system. Furthermore, in addition to researching an on-demand system, we also go beyond the existing on-demand solutions and present a live streaming system which strikes a trade-off between bandwidth usage and the video quality in the user’s FoV. We have created an architecture that combines RTP and DASH, and our system multiplexes a single HEVC hardware decoder to provide faster quality switching than at the traditional GOP boundaries. We demonstrate the performance and illustrate the trade-offs through real-world experiments where we can report comparable bandwidth savings to existing on-demand approaches, but with faster quality switches when the FoV changes.

scholarly journals Transverse Chromatic Aberrations in Virtual Reality Devices

Frameless ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 1-4
Author(s):  
Ryan Beams ◽  
◽  
Wei-Chung Cheng ◽  
Andrea S. Kim ◽  
Aldo Badano ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Image Quality ◽  
Relative Size ◽  
Chromatic Aberration ◽  
Field Of View ◽  
Test Results ◽  
Optical Performance ◽  
Color Changes ◽  
Head Mounted Display ◽  
Chromatic Aberrations

We demonstrate a method for measuring the transverse chromatic aberration (TCA) in a virtual reality head-mounted display (VR HMD). This procedure was used to characterize the optical performance of the Oculus Go VR HMD. Results show a measurable TCA for angles larger than approximately 6◦ from the center of the field of view. TCA can be thought of as a wavelength dependent magnification, and as a result, the relative size of objects vary based on the rendering color. In addition, this leads to color changes in the image due to mixing with neighboring pixels, which impacts image quality. The test results for the Oculus Go show promise for characterizing TCA across different HMDs.

scholarly journals Perspective on the Double Edges of Virtual Reality in Medicine - both Addiction & Treatment

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Marcel-Alexandru Găină ◽  
Alexandra Boloș ◽  
Ovidiu Alexinschi ◽  
Ana-Caterina Cristofor ◽  
Alexandra-Maria Găină ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Real World ◽  
Behavioral Problems ◽  
Addiction Treatment ◽  
Prolonged Exposure ◽  
Therapeutic Potential ◽  
Psychological Traits ◽  
The Real ◽  
Head Mounted Display ◽  
Processing Power

Although the therapeutic potential of virtual reality has been foreseen since over half a century ago, the lack of graphical processing power made it impossible to apply in medical therapeutic sciences until last decade; nowadays, the hardware required for virtual reality is even 100 times more affordable. A head-mounted display induces immersivity engulfing the subject’s eyesight perception in a stereoscopic manner. The same tool that may aid better self understanding and bonding can also trigger psychopathological mechanisms through which the user becomes alienated from the real world. As virtual reality became even more popular during SARS-COV2 pandemic, users worldwide have spent more time into a virtual world. Depersonalization/derealization syndrome can occur if virtual reality is abused. The greater the person’s involvement in virtual reality, the greater the chance of a lack of bodily self (depersonalization). Controllers that mimic hands could prevent the subject from acknowledging the real world as true – derealization. Virtual reality’s dissociative potential is related to individual psychological traits and prolonged exposure. Children are the most prone to develop behavioral changes. Adults may develop behavioral problems related to virtual reality gaming, gambling, pornography and also social networking through created avatars. Blue light wavelength could harm sleep architecture and circadian rhythm by disrupting melatonin, therefore making virtual reality exposure problematic after sunset. State of the art reveals that using virtual reality in a therapeutic manner, actually facilitates the fight against addictions with cue therapy intended to extinguish conditioned response. The exposure to a substance (nicotine, alcohol, or any other psychoactive recreational abuse potential substances) can trigger craving in a controlled environment, that is malleable in the hands of the therapist. Virtual reality can offer an exposure perspective that is both vivid enough to be a challenge, but also safe enough to ensure patient involvement and to amplify the therapeutic alliance.

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