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https://www.readbyqxmd.com/read/29221081/design-and-prototype-of-an-augmented-reality-display-with-per-pixel-mutual-occlusion-capability
#1
Austin Wilson, Hong Hua
State-of-the-art optical see-through head-mounted displays for augmented reality (AR) applications lack mutual occlusion capability, which refers to the ability to render correct light blocking relationship when merging digital and physical objects, such that the virtual views appear to be ghost-like and lack realistic appearance. In this paper, using off-the-shelf optical components, we present the design and prototype of an AR display which is capable of rendering per-pixel mutual occlusion. Our prototype utilizes a miniature organic light emitting display coupled with a liquid crystal on silicon type spatial light modulator to achieve an occlusion capable AR display offering a 30° diagonal field of view and an angular resolution of 1...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29167538/a-deep-dream-virtual-reality-platform-for-studying-altered-perceptual-phenomenology
#2
Keisuke Suzuki, Warrick Roseboom, David J Schwartzman, Anil K Seth
Altered states of consciousness, such as psychotic or pharmacologically-induced hallucinations, provide a unique opportunity to examine the mechanisms underlying conscious perception. However, the phenomenological properties of these states are difficult to isolate experimentally from other, more general physiological and cognitive effects of psychoactive substances or psychopathological conditions. Thus, simulating phenomenological aspects of altered states in the absence of these other more general effects provides an important experimental tool for consciousness science and psychiatry...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29165689/oculomotor-disturbances-in-patients-with-chronic-nonspecific-spinal-pain
#3
Ruth Ruscheweyh, Antonia Fritz, Thomas Eggert, Shahnaz-Christina Azad, Andreas Straube
Objective: There is increasing evidence that the cerebellum has a role in pain processing. The present study investigates whether chronic pain patients, who are likely to have altered pain processing, exhibit signs of subtle cerebellar dysfunction. We used oculomotor tasks to assess dysfunction of the associated neuronal networks, including the cerebellum. Methods: Thirty patients with chronic nonspecific spinal pain and 30 age- and sex-matched controls were enrolled...
November 18, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29151194/highly-immersive-virtual-reality-laparoscopy-simulation-development-and-future-aspects
#4
Tobias Huber, Tom Wunderling, Markus Paschold, Hauke Lang, Werner Kneist, Christian Hansen
PURPOSE: Virtual reality (VR) applications with head-mounted displays (HMDs) have had an impact on information and multimedia technologies. The current work aimed to describe the process of developing a highly immersive VR simulation for laparoscopic surgery. METHODS: We combined a VR laparoscopy simulator (LapSim) and a VR-HMD to create a user-friendly VR simulation scenario. Continuous clinical feedback was an essential aspect of the development process. We created an artificial VR (AVR) scenario by integrating the simulator video output with VR game components of figures and equipment in an operating room...
November 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29091700/flat-metaform-near-eye-visor
#5
Chuchuan Hong, Shane Colburn, Arka Majumdar
A near-eye visor is one of the most vital components in a head-mounted display. Currently, freeform optics and waveguides are used to design near-eye visors, but these structures are complex and their field of view is limited when the visor is placed near the eye. In this paper, we propose a flat, freeform near-eye visor that uses a subwavelength patterned metasurface reflector. The visor design imparts a spatial phase profile on a projected display pattern and can be implemented using a micron-scale-thick metasurface...
November 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29060895/manipulating-the-fidelity-of-lower-extremity-visual-feedback-to-identify-obstacle-negotiation-strategies-in-immersive-virtual-reality
#6
Aram Kim, Zixuan Zhou, Kari S Kretch, James M Finley
The ability to successfully navigate obstacles in our environment requires integration of visual information about the environment with estimates of our body's state. Previous studies have used partial occlusion of the visual field to explore how information about the body and impending obstacles are integrated to mediate a successful clearance strategy. However, because these manipulations often remove information about both the body and obstacle, it remains to be seen how information about the lower extremities alone is utilized during obstacle crossing...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29047808/optical-elements-containing-semitransparent-wavelike-films
#7
Anatoly M Smolovich, Valery Chernov
Novel optical elements containing semitransparent wavelike films embedded into the bulk of transparent material, which form a reflection image without transmitted light distortion, are studied. The dynamic theory of light diffraction by a locally periodic multilayer semitransparent wavelike film is developed. A simple analytical formula for near Bragg diffraction order intensity is obtained for the case when only one diffraction order lies within the hologram angular selectivity. The phase modulation of light transmitted through the optical element containing wavelike films is estimated for single-layer and multilayer wavelike films with an arbitrary shape of surface...
August 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29041633/high-dynamic-range-head-mounted-display-based-on-dual-layer-spatial-modulation
#8
Miaomiao Xu, Hong Hua
The human visual system can perceive a much wider range of contrast than the addressable dynamic range afforded by the state-of-art head mounted displays (HMD). Increasing the dynamic range of HMDs becomes critical especially for augmented reality applications where the dynamic range of outdoor scenes can be as large as 14 orders of magnitude. In this paper, we present the integrated work of the design, implementation, calibration, and image-rendering algorithm of a high dynamic range HMD system. By using a pair of LCoS microdisplays as the spatial light modulators, accompanied with the relay optics to optically overlay the modulation layers, we demonstrate the reconstruction of high dynamic range images with high accuracy...
September 18, 2017: Optics Express
https://www.readbyqxmd.com/read/29038450/visuo-acoustic-stimulation-that-helps-you-to-relax-a-virtual-reality-setup-for-patients-in-the-intensive-care-unit
#9
Stephan M Gerber, Marie-Madlen Jeitziner, Patric Wyss, Alvin Chesham, Prabitha Urwyler, René M Müri, Stephan M Jakob, Tobias Nef
After prolonged stay in an intensive care unit (ICU) patients often complain about cognitive impairments that affect health-related quality of life after discharge. The aim of this proof-of-concept study was to test the feasibility and effects of controlled visual and acoustic stimulation in a virtual reality (VR) setup in the ICU. The VR setup consisted of a head-mounted display in combination with an eye tracker and sensors to assess vital signs. The stimulation consisted of videos featuring natural scenes and was tested in 37 healthy participants in the ICU...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29037079/development-of-novel-adjustable-focus-head-mount-display-for-concurrent-image-guided-treatment-applications
#10
Hojong Choi, Jaemyung Ryu, Changhan Yoon
PURPOSE: A conventional see-through head mount display contains many optical lenses, which can be problematic in image-guided treatment applications due to its size, weight, structure, and focus limitation. Therefore, we have designed a new type of see-through head mount display with a reduced number of optical lenses and an adequate optical resolution that can be utilized for image-guided treatment applications. MATERIALS AND METHODS: A new type of adjustable focus head mount display with expanded virtual images and an external treatment space that can be provided to the eyes of a user by enlarging the images of a small display is designed and investigated in this study...
October 16, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/29029596/additional-visualization-via-smart-glasses-improves-accuracy-of-wire-insertion-in-fracture-surgery
#11
Masanori Tsubosaka, Takafumi Hiranaka, Kenjiro Okimura, Yuta Nakanishi, Yosaku Shibata, Yuichi Hida, Takaaki Fujishiro, Harunobu Uemoto
BACKGROUND: Smart glasses (SG) are a wearable device consisting of a small computer built into a head-mounted monitor (HMM) that can display various kinds of information. Lateral side visualization is displayed on the HMM of SG so the operator may also see it and the anteroposterior (AP) direction simultaneously. The present pilot study aimed to investigate the usefulness of SG in wire insertion for bone fracture. METHODS: We marked both the front and lateral sides of the shaft of an artificial femur bone...
October 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28991916/the-essential-role-of-optical-flow-in-the-peripheral-visual-field-for-stable-quiet-standing-evidence-from-the-use-of-a-head-mounted-display
#12
Kentaro Horiuchi, Masami Ishihara, Kuniyasu Imanaka
It has long been thought that vision is the most essential factor in maintaining stable quiet standing compared to other sources (i.e., vestibular and somatosensory inputs) of information. Specifically, several vision studies on postural control have shown evidence for the importance of the visual system, particularly peripheral vision rather than central vision, and optical flow. Nevertheless, to date, no study has manipulated both visual field and optical flow concurrently. In the present study, we experimentally manipulated both the visual field (the central and peripheral visual fields) and the occurrence of optical flow during quiet standing, examining the effects of the visual field and optical flow on postural sway measured in terms of the center of pressure (CoP)...
2017: PloS One
https://www.readbyqxmd.com/read/28986411/virtual-reality-improves-embodiment-and-neuropathic-pain-caused-by-spinal-cord-injury
#13
RANDOMIZED CONTROLLED TRIAL
Polona Pozeg, Estelle Palluel, Roberta Ronchi, Marco Solcà, Abdul-Wahab Al-Khodairy, Xavier Jordan, Ammar Kassouha, Olaf Blanke
OBJECTIVE: To investigate changes in body ownership and chronic neuropathic pain in patients with spinal cord injury (SCI) using multisensory own body illusions and virtual reality (VR). METHODS: Twenty patients with SCI with paraplegia and 20 healthy control participants (HC) participated in 2 factorial, randomized, repeated-measures design studies. In the virtual leg illusion (VLI), we applied asynchronous or synchronous visuotactile stimulation to the participant's back (either immediately above the lesion level or at the shoulder) and to the virtual legs as seen on a VR head-mounted display...
October 31, 2017: Neurology
https://www.readbyqxmd.com/read/28961115/a-survey-of-calibration-methods-for-optical-see-through-head-mounted-displays
#14
Jens Grubert, Yuta Itoh, Kenneth R Moser, J Edward Swan Ii
Optical see-through head-mounted displays (OST HMDs) are a major output medium for Augmented Reality, which have seen significant growth in popularity and usage among the general public due to the growing release of consumer-oriented models, such as the Microsoft Hololens. Unlike Virtual Reality headsets, OST HMDs inherently support the addition of computer-generated graphics directly into the light path between a user's eyes and their view of the physical world. As with most Augmented and Virtual Reality systems, the physical position of an OST HMD is typically determined by an external or embedded 6-Degree-of-Freedom tracking system...
September 28, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28883717/assessing-balance-through-the-use-of-a-low-cost-head-mounted-display-in-older-adults-a-pilot-study
#15
Santiago J Saldana, Anthony P Marsh, W Jack Rejeski, Jack K Haberl, Peggy Wu, Scott Rosenthal, Edward H Ip
INTRODUCTION: As the population ages, the prevention of falls is an increasingly important public health problem. Balance assessment forms an important component of fall-prevention programs for older adults. The recent development of cost-effective and highly responsive virtual reality (VR) systems means new methods of balance assessment are feasible in a clinical setting. This proof-of-concept study made use of the submillimeter tracking built into modern VR head-mounted displays (VRHMDs) to assess balance through the use of visual-vestibular conflict...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28866590/the-hologram-in-my-hand-how-effective-is-interactive-exploration-of-3d-visualizations-in-immersive-tangible-augmented-reality
#16
Benjamin Bach, Ronell Sicat, Johanna Beyer, Maxime Cordeil, Hanspeter Pfister
We report on a controlled user study comparing three visualization environments for common 3D exploration. Our environments differ in how they exploit natural human perception and interaction capabilities. We compare an augmented-reality head-mounted display (Microsoft HoloLens), a handheld tablet, and a desktop setup. The novel head-mounted HoloLens display projects stereoscopic images of virtual content into a user's real world and allows for interaction in-situ at the spatial position of the 3D hologram...
August 29, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28859092/seeing-virtual-while-acting-real-visual-display-and-strategy-effects-on-the-time-and-precision-of-eye-hand-coordination
#17
Anil U Batmaz, Michel de Mathelin, Birgitta Dresp-Langley
Effects of different visual displays on the time and precision of bare-handed or tool-mediated eye-hand coordination were investigated in a pick-and-place-task with complete novices. All of them scored well above average in spatial perspective taking ability and performed the task with their dominant hand. Two groups of novices, four men and four women in each group, had to place a small object in a precise order on the centre of five targets on a Real-world Action Field (RAF), as swiftly as possible and as precisely as possible, using a tool or not (control)...
2017: PloS One
https://www.readbyqxmd.com/read/28829317/multimodal-evaluation-of-the-differences-between-real-and-virtual-assemblies
#18
Mikel Sagardia, Thomas Hulin
What are the technological bottlenecks in virtual assembly simulations with haptic feedback? To tackle this question, we present an evaluation study in which real feedback modalities are gradually replaced by synthetic ones. In particular, the effects of the following factors on the user performance and perception during virtual assemblies are analyzed: (i) a visual feedback system consisting of an nVisor head-mounted display, (ii) our haptic device HUG suited for unscaled upper-body movements, and (iii) our novel six-DoF constraint-based haptic rendering algorithm...
August 18, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28816519/the-effects-of-exercise-on-a-choice-reaction-time-task-in-individuals-with-post-concussion-syndrome
#19
Stephanie A Ramautar, Alyssa A Prangley, Michael E Cinelli
PURPOSE: To assess cognitive performance differences pre- and post-exercise in individuals without concussion (non-concussed, NC) and individuals with post-concussion syndrome (PCS). METHODS: A total of 30 participants completed a choice reaction time (CRT) task in the form of an iPad application, measuring each individual's decision-making capabilities, while wearing a head-mounted eye tracker system. Participants completed four blocks of testing; the time interval between the first two blocks of trials and the last two blocks of trials was 10 minutes...
2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28813567/comparison-of-view-based-and-reconstruction-based-models-of-human-navigational-strategy
#20
COMPARATIVE STUDY
Luise Gootjes-Dreesbach, Lyndsey C Pickup, Andrew W Fitzgibbon, Andrew Glennerster
There is good evidence that simple animals, such as bees, use view-based strategies to return to a familiar location, whereas humans might use a 3-D reconstruction to achieve the same goal. Assuming some noise in the storage and retrieval process, these two types of strategy give rise to different patterns of predicted errors in homing. We describe an experiment that can help distinguish between these models. Participants wore a head-mounted display to carry out a homing task in immersive virtual reality. They viewed three long, thin, vertical poles and had to remember where they were in relation to the poles before being transported (virtually) to a new location in the scene from where they had to walk back to the original location...
August 1, 2017: Journal of Vision
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