Localization of a Monocularly Presented Virtual Object with Delayed Visual Feedback

1998 ◽  
Vol 42 (22) ◽  
pp. 1595-1599 ◽  
Author(s):  
Jeffrey W. McCandless ◽  
Stephen R. Ellis ◽  
Bernard D. Adelstein
Keyword(s):  
Time Delay ◽  
Visual Feedback ◽  
Time Delays ◽  
Motion Parallax ◽  
Virtual Object ◽  
Distance Information ◽  
Object Position ◽  
Head Mounted Display ◽  
Delayed Visual Feedback ◽  
Apparent Stability

Observers adjusted a pointer to match the depicted distance of a monocular virtual object viewed in a see-through head-mounted display. Distance information was available through motion parallax produced as the observers rocked back and forth. The apparent stability of the virtual object was impaired by the time delay between the observers' head motions and the corresponding change in the object position on the display. Localizations were made for four time delays (31 ms, 64 ms, 131 ms, and 197 ms) and three depicted distances (75 cm, 95 cm, and 113 cm). The errors in localizations increased systematically with time delay and depicted distance.

Localization of a Time-Delayed, Monocular Virtual Object Superimposed on a Real Environment

2000 ◽  
Vol 9 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Jeffrey W. McCandless ◽  
Stephen R. Ellis ◽  
Bernard D. Adelstein
Keyword(s):  
Time Delay ◽  
Time Delays ◽  
Motion Parallax ◽  
Virtual Object ◽  
Distance Information ◽  
Object Position ◽  
Real Environment ◽  
Judgment Error ◽  
Projected Position ◽  
Apparent Stability

Observers adjusted a pointer to match the depicted distance of a monocular virtual object viewed in a see-through, had-mounted display. Distance information was available through motion parallax produced as the observers rocked side to side. The apparent stability of the virtual object was impaired by a time delay between the observers' head motions and the corresponding change in the object position on the display. Localizations were made for four time delays (31 ms, 64 ms, 131 ms, and 197 ms) and three depicted distances (75 cm, 95 cm, and 113 cm). The errors in localizations increased systematically with time delay and depicted distance. A model of the results shows that the judgment error and lateral projected position of the virtual object are each linearly related to time delay.

Effects of Time Delay on Depth Perception via Head-Motion Parallax in Virtual Environment Systems

2000 ◽  
Vol 9 (6) ◽  
pp. 638-647 ◽  
Author(s):  
Hanfeng Yuan ◽  
W. L. Sachtler ◽  
Nat Durlach ◽  
Barbara Shinn-Cunningham
Keyword(s):  
Time Delay ◽  
Virtual Environment ◽  
Depth Perception ◽  
Head Movement ◽  
Time Delays ◽  
Motion Parallax ◽  
Head Motion ◽  
Depth Cues ◽  
Random Dot Patterns

Experiments were conducted to determine how the ability to detect and discriminate head-motion parallax depth cues is degraded by time delays between head movement and image update. The stimuli consisted of random-dot patterns that were programmed to appear as one cycle of a sinusoi dal grating when the subject's head moved. The results show that time delay between head movement and image update has essentially no effect on the ability to discrimi nate between two such gratings with different depth char acteristics when the delay is less than or equal to roughly 265 ms.

scholarly journals Delay-Dependent Robust Stabilization for Nonlinear Large Systems via Decentralized Fuzzy Control

2011 ◽  
Vol 2011 ◽  
pp. 1-20 ◽  
Author(s):  
Chun-xia Dou ◽  
Zhi-sheng Duan ◽  
Xing-bei Jia ◽  
Xiao-gang Li ◽  
Jin-zhao Yang ◽  
...  
Keyword(s):  
Time Delay ◽  
Fuzzy Control ◽  
Upper Bound ◽  
Time Delays ◽  
Sufficient Conditions ◽  
Large System ◽  
Disturbance Attenuation ◽  
Robust Controller ◽  
Large Systems ◽  
Delay Dependent

A delay-dependent robust fuzzy control approach is developed for a class of nonlinear uncertain interconnected time delay large systems in this paper. First, an equivalent T–S fuzzy model is extended in order to accurately represent nonlinear dynamics of the large system. Then, a decentralized state feedback robust controller is proposed to guarantee system stabilization with a prescribedH∞disturbance attenuation level. Furthermore, taking into account the time delays in large system, based on a less conservative delay-dependent Lyapunov function approach combining with linear matrix inequalities (LMI) technique, some sufficient conditions for the existence ofH∞robust controller are presented in terms of LMI dependent on the upper bound of time delays. The upper bound of time-delay and minimizedH∞performance index can be obtained by using convex optimization such that the system can be stabilized and for all time delays whose sizes are not larger than the bound. Finally, the effectiveness of the proposed controller is demonstrated through simulation example.

scholarly journals Methods for broadband signals mutual time delays estimating enhancement

2019 ◽  
Vol 30 ◽  
pp. 03012
Author(s):  
Ilya Grin ◽  
Oleg Morozov
Keyword(s):  
Time Delay ◽  
Computational Efficiency ◽  
Radiation Source ◽  
Time Delays ◽  
Time Delay Estimation ◽  
Ambiguity Function ◽  
Delay Estimation ◽  
Reliability Criterion ◽  
Optimal Processing ◽  
Narrowband Channels

This paper considers methods for estimating the mutual time delay of broadband signals recorded by satellites based multi-position systems for determining the location of a radiation source. All methods considered are based on modified algorithms for calculating the ambiguity function. The presented algorithms are based on the extraction of narrowband channels from the studied signals and their further optimal processing. The reliability criterion for mutual time delay estimation by the presented methods was evaluated. Based on the results and analysis of computational efficiency, viability of methods considered and their modifications was determined.

Delayed Visual Feedback While Learning to Track a Moving Target

1996 ◽  
Vol 67 (4) ◽  
pp. 416-423 ◽  
Author(s):  
Heather Carnahan ◽  
Craig Hall ◽  
Timothy D. Lee
Keyword(s):  
Visual Feedback ◽  
Moving Target ◽  
Delayed Visual Feedback

Contributions of delayed visual feedback and cognitive task load to postural dynamics

2010 ◽  
Vol 481 (3) ◽  
pp. 173-177 ◽  
Author(s):  
Ting Ting Yeh ◽  
Jason Boulet ◽  
Tyler Cluff ◽  
Ramesh Balasubramaniam
Keyword(s):  
Visual Feedback ◽  
Cognitive Task ◽  
Task Load ◽  
Delayed Visual Feedback

Time-Intensity Trade for Speech: A Temporal Speech-Stenger Effect

1976 ◽  
Vol 19 (4) ◽  
pp. 749-766 ◽  
Author(s):  
Michael J.M. Raffin ◽  
David J. Lilly ◽  
Aaron R. Thornton
Keyword(s):  
Time Delay ◽  
Clinical Application ◽  
Time Delays ◽  
Multiple Images ◽  
Potential Clinical Application ◽  
Interaural Time Delay ◽  
Lateralization Effect

Time-intensity trade for selected spondaically stressed words was investigated using a centering method for interaural time delays of 0.00, 1.00, 2.00, 2.25, 2.50, and 2.75 msec at five levels of presentation: 0-, 25-, 40-, 55-, and 70-dB HL (ANSI, 1969). Lateralization effects increased with level of presentation, with a maximum lateralization effect of between 22 and 30 dB occuring with an interaural time delay of 2.25 msec. Multiple images were perceived by all subjects with an interaural time delay of 2.75 msec and by some subjects with an interaural time delay of 2.50 msec at high levels of presentation. No “ear effect” was observed for any of the listeners. A potential clinical application is discussed for this temporal speech-Stenger effect.

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