| 1891. |
- Elwardy, Majed, et al.
(author)
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On the Number of Subjects Needed for 360° Video Quality Experiments : An SOS Based Analysis
- 2022
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In: <em>International Conference on Quality of Multimedia Experience, QoMEX 2022</em>. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781665487948
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Conference paper (peer-reviewed)abstract
- Subjective 360° video quality experiments provide the ground truth for developing related systems such that acceptable quality of experience is offered to the users. To obtain statistically meaningful insights from the data recorded in quality experiments, engaging a sufficiently large number of subjects is essential. In contrast to conventional videos, little has been reported on statistical measures that may guide the choice of the number of subjects required for 360° video quality experiments. In this paper, the standard deviation of opinion score (SOS) hypothesis, measuring the diversity among the opinion scores given by a panel of subjects, is used to reveal the number of subjects needed. It is shown that the number of subjects needed varies depending on a threshold on SOS characteristics in terms of diversity among opinion scores. © 2022 IEEE.
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| 1892. |
- Elwardy, Majed, et al.
(author)
-
On the Opinion Score Consistency in Repeated 360° Video Quality Assessment for Standing and Seated Viewing on Head-Mounted Displays
- 2021
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In: 2021 15th International Conference on Signal Processing and Communication Systems, ICSPCS 2021 - Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781665436991
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Conference paper (peer-reviewed)abstract
- The development of immersive media systems and services relies on subjective tests that provide ground truth on the quality of experience as perceived by humans. In this paper, we investigate the opinion score consistency through a repeated subjective 360° video quality assessment experiment. The test stimuli are presented on a head-mounted display with participants given the task to rate the video quality in three repeated sessions for both standing and seated viewing. The statistical analysis of the data from the subjective tests aims at revealing if participants change their rating behavior over time or keep their opinion scores given to the test stimuli in standing and seated viewing consistent in a statistical sense. The experimental results are reported in terms of histograms of opinion scores, skewness and kurtosis of opinion scores, mean opinion scores, standard deviation of opinion scores (SOS), SOS fitting functions, and analysis of variance tests. The statistical analysis supports the conjecture that each participant has its own but consistent rating behavior throughout the respective sessions for standing and seated viewing. The finding that the quality rating behavior of the individual participant does not fundamentally change over time may, e.g., assist in scheduling subjective tests under pandemic conditions where experimental campaigns may need to be stalled for an unknown period of time. © 2021 IEEE.
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| 1893. |
- Elwardy, Majed, et al.
(author)
-
SSV360 : A Dataset on Subjetive Quality Assessment of 360° Videos for Standing and Seated Viewing on an HMD
- 2022
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In: Proceedings - 2022 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops, VRW 2022. - : IEEE Computer Society. - 9781665484022 ; , s. 189-194
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Conference paper (peer-reviewed)abstract
- In this paper, we introduce the SSV360 dataset containing psy-chophysical and psychophysiological data gathered in a pilot study on the effect of standing and seated viewing of 360° videos on subjective quality assessment. The stimuli were shown to the participants on a head-mounted display for both viewing conditions. The ground truth contained in the SSV360 dataset may support, e.g., benchmarking of immersive media processing algorithms and developing of objective perceptual quality metrics. © 2022 IEEE.
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| 1894. |
- Elwing, Robert, et al.
(author)
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Performance of SOAP in Web Service Environment Compared to CORBA.
- 2002
-
Conference paper (peer-reviewed)abstract
- Web Services is a new concept that promises flexibility and interconnection between different systems. The communication in Web Services uses SOAP $Simple Object Access Protocol, which is based on XML. We have together with an industrial partner made experiments with SOAP in a Web Service environment to find out the response time using SOAP compared to CORBA. It turns out that a direct and naive use of SOAP would result in a response time degradation of a factor 400 compared to CORBA. We identified the major reasons for the poor performance of SOAP and evaluated some performance improvement techniques. After applying these the techniques, the performance of CORBA is 7 times better compared to SOAP.
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| 1895. |
- Emam, Seyed Mohammad, et al.
(author)
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Improving the Accuracy of Laser Scanning for 3D Model Reconstruction Using Dithering Technique
- 2014
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In: Procedia Technology. - : Elsevier.
-
Conference paper (peer-reviewed)abstract
- Triangulation technique is one of the most commonly techniques used in three dimensional measurements. Depth reconstruction accuracy is a direct impact of the quantization process and this is related to the number of pixels of the sensor. Dithering technique (DT) benefits from relative fine movement between object and sensor to reduce the quantization error. This paper describes the theory of the DT and establishes a mathematical model. To evaluate if DT technique can improve the accuracy in real world, a control rig was designed and built, following which experiments were performed. The results showed that considerable improvement can be achieved in measurement accuracy.
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| 1896. |
- Emami, A, et al.
(author)
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An ethnographic study of a day care center for Iranian immigrant seniors
- 2000
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In: Western Journal of Nursing Research. - THOUSAND OAKS : SAGE PUBLICATIONS INC. - 0193-9459 .- 1552-8456. ; 22:2, s. 169-188
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Journal article (peer-reviewed)abstract
- Late-in-life immigrants are often at risk for psychological stress and social isolation because of language problems, small social networks, and cultural differences from the host society. Community intervention programs can reduce such stress and isolation. In this article, the authors describe a Swedish municipality's culturally appropriate intervention program for elderly Iranian immigrants based on ethnographic data gathered during a 12 month period The description includes the activities provided by the program and the experiences of the elderly Iranian immigrants who participate regularly in these activities. The findings document the positive impact of regular participation in the center's activities on the elders' well-being and health.
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| 1897. |
- Emami, A, et al.
(author)
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Health as continuity and balance in life
- 2000
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In: Western Journal of Nursing Research. - THOUSAND OAKS : SAGE PUBLICATIONS INC. - 0193-9459 .- 1552-8456. ; 22:7, s. 812-825
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Journal article (peer-reviewed)abstract
- Research on immigrant health emphasizes that the elderly are more vulnerable than other age groups in many immigrant populations. This study describes the meanings of health, illness, and disease for Iranian elderly immigrants in Sweden and their relationships with life disruptions. Analysis of interviews using an interprerive-phenomenological method illustrates that the participants experience health as continuity and balance in life. Any disruption of this balance creates a sense of illness that is only partially related to the emergence of disease. Participants did nor view health and disease as polarized. Rather disease is just one component among many that may disrupt the experience of health. Health is perceived as a sense of well-being, can be achieved in spite of disease, and can be disrupted even in the absence of disease. This description of the meaning of health, disease, and illness contrasts with the Western biomedical perspective and is similar in its holism to various non-Western medical systems and complementary approaches. This knowledge can foster more culturally sensitive care.
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| 1898. |
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| 1899. |
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| 1900. |
- Emmelin, Lars
(author)
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EIA follow up
- 2007
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In: Standards and Thresholds for Impact Assessment. - : Springer Verlag..
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Book chapter (other academic/artistic)
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