Augmented and Virtual Reality

Wetzstein, Gordon

doi:10.1007/978-3-030-18338-7_25

Cited by 3 publications

(2 citation statements)

References 168 publications

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“…We investigated the influence of the low-pass cut-off frequency of the linear acceleration ( f LP ) as well as the correction factor α on the estimate quality and compared our approach with a previously described complementary filter method (Wetzstein, 2017). The accuracy was measured with the geodesic distance from the estimated quaternion q to the gold standard quaternion q GS (corresponding to the angle of the shortest arc between the two orientations, Huynh, 2009):…”

Section: Methodsmentioning

confidence: 99%

Ecological Momentary Assessment of Head Motion: Toward Normative Data of Head Stabilization

Hausamann

Däumer

MacNeilage

et al. 2019

Front. Hum. Neurosci.

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Head stabilization is fundamental for balance during locomotion but can be impaired in elderly or diseased populations. Previous studies have identified several parameters of head stability with possible diagnostic value in a laboratory setting. Recently, the ecological validity of measures obtained in such controlled contexts has been called into question. The aim of this study was to investigate the ecological validity of previously described parameters of head stabilization in a real-world setting. Ten healthy subjects participated in the study. Head and trunk movements of each subject were recorded with inertial measurement units (IMUs) for a period of at least 10 h. Periods of locomotion were extracted from the measurements and predominant frequencies, root mean squares (RMSs) and bout lengths were estimated. As parameters of head stabilization, attenuation coefficients (ACs), harmonic ratios (HRs), coherences, and phase differences were computed. Predominant frequencies were distributed tightly around 2 Hz and ACs, HRs, and coherences exhibited the highest values in this frequency range. All head stability parameters exhibited characteristics consistent with previous reports, although higher variances were observed. These results suggest that head stabilization is tuned to the 2 Hz fundamental frequency of locomotion and that previously described measures of head stability could generalize to a real-world setting. This is the first study to address the ecological validity of these measures, highlighting the potential use of head stability parameters as diagnostic tools or outcome measures for clinical trials. The low cost and ease of use of the IMU technology used in this study could additionally be of benefit for a clinical application.

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Section: Methodsmentioning

confidence: 99%

Ecological Momentary Assessment of Head Motion: Toward Normative Data of Head Stabilization

Hausamann

Däumer

MacNeilage

et al. 2019

Front. Hum. Neurosci.

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“…This results in a drift in g because the noise in ω is also integrated. To solve this problem, ω q is a calibrated angle velocity obtained using a complementary filter [36] to reduce the sensing tilt from the IMU. Complementary filter Q(ω, f ) outputs a quaternion vector q ∈ R 4 to present the orientation calculated from the ω and f :…”

Section: Internal Modelsmentioning

confidence: 99%

Subjective Vertical Conflict Model With Visual Vertical: Predicting Motion Sickness on Autonomous Personal Mobility Vehicles

Liu,

Inoue,

Wada

2024

IEEE Trans. Intell. Transport. Syst.

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Passengers of level 3-5 autonomous personal mobility vehicles (APMV) can perform non-driving tasks, such as reading books and smartphones, while driving. It has been pointed out that such activities may increase motion sickness, especially when frequently avoiding pedestrians or obstacles in shared spaces. Many studies have been conducted to build countermeasures, of which various computational motion sickness models have been developed. Among them, models based on subjective vertical conflict (SVC) theory, which describes vertical changes in direction sensed by human sensory organs v.s. those expected by the central nervous system, have been actively developed. To model motion sickness due to conflict between visual vertical information and vestibular sensation, we proposed a 6 DoF SVC-VV model which added a visually perceived vertical block into a conventional 6 DoF SVC model to predict visual vertical directions from image data simulating the visual input of a human. In a driving experiment, 27 participants rode on the APMV and experienced slalom driving with two visual conditions: looking ahead (LAD) and working with a tablet device (WAD). We verified that passengers got motion sickness while riding the APMV, and the symptoms were severer when especially working on it, by simulating the frequent pedestrian avoidance scenarios of the APMV in the experiment. In addition, the results of the experiment demonstrated that the proposed 6 DoF SVC-VV model could describe the increased motion sickness experienced when the visual vertical and gravitational acceleration directions were different.

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The Perceptual Science of Augmented Reality

Cooper

2023

Annu. Rev. Vis. Sci.

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Augmented reality (AR) systems aim to alter our view of the world and enable us to see things that are not actually there. The resulting discrepancy between perception and reality can create compelling entertainment and can support innovative approaches to education, guidance, and assistive tools. However, building an AR system that effectively integrates with our natural visual experience is hard. AR systems often suffer from visual limitations and artifacts, and addressing these flaws requires basic knowledge of perception. At the same time, AR system development can serve as a catalyst that drives innovative new research in perceptual science. This review describes recent perceptual research pertinent to and driven by modern AR systems, with the goal of highlighting thought-provoking areas of inquiry and open questions. Expected final online publication date for the Annual Review of Vision Science, Volume 9 is September 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Augmented and Virtual Reality

Cited by 3 publications

References 168 publications

Ecological Momentary Assessment of Head Motion: Toward Normative Data of Head Stabilization

Ecological Momentary Assessment of Head Motion: Toward Normative Data of Head Stabilization

Subjective Vertical Conflict Model With Visual Vertical: Predicting Motion Sickness on Autonomous Personal Mobility Vehicles

The Perceptual Science of Augmented Reality

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