Pervasive and standalone computing: the perceptual effects of variable multimedia quality

Gulliver, Stephen R.; Şerif, Tacha; Ghinea, Gheorghita

doi:10.1016/j.ijhcs.2003.11.002

Cited by 27 publications

(19 citation statements)

References 52 publications

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“…There is also quantitative user-oriented approach to evaluate the Quality of Perception (QoP) [10,12]. Multidimensional QoP is a combination of information assimilation and satisfaction formulated from dimensions of enjoyment and subjective, but content independent objective quality (e.g.…”

Section: Quantitative Qualitative and Mixed Methods Of Quality Evalumentioning

confidence: 99%

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Experienced quality factors: qualitative evaluation approach to audiovisual quality

2007

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Subjective evaluation is used to identify impairment factors of multimedia quality. The final quality is often formulated via quantitative experiments, but this approach has its constraints, as subject's quality interpretations, experiences and quality evaluation criteria are disregarded. To identify these quality evaluation factors, this study examined qualitatively the criteria participants used to evaluate audiovisual video quality. A semi-structured interview was conducted with 60 participants after a subjective audiovisual quality evaluation experiment. The assessment compared several, relatively low audio-video bitrate ratios with five different television contents on mobile device. In the analysis, methodological triangulation (grounded theory, Bayesian networks and correspondence analysis) was applied to approach the qualitative quality. The results showed that the most important evaluation criteria were the factors of visual quality, contents, factors of audio quality, usefulness -followability and audiovisual interaction. Several relations between the quality factors and the similarities between the contents were identified. As a research methodological recommendation, the focus on content and usage related factors need to be further examined to improve the quality evaluation experiments.

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Section: Quantitative Qualitative and Mixed Methods Of Quality Evalumentioning

confidence: 99%

“…[25]), frame rate (the number of frames per second (fps) e.g. [12,26] and the frame quality factors like bitrate (the number of bits used to code a particular piece of data (bps) e.g. [25,26], codec (compression standards for compression/decompression e.g.…”

Section: Quality Productionmentioning

confidence: 99%

Experienced quality factors: qualitative evaluation approach to audiovisual quality

2007

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“…The quality of perception combines different approaches in subjective evaluation of multimedia quality. Gulliver et al [6] divided QoP further into sections of information assimilation and satisfaction. Satisfaction has two dimensions, enjoyment and level of objective quality, which can be evaluated separately.…”

Section: Towards Understanding Human Perception In Quality Evaluationsmentioning

confidence: 99%

<title>Effect of TV content in subjective assessment of video quality on mobile devices</title>

Jumisko

Ilvonen

Väänänen-Vainio-Mattila

2005

Multimedia on Mobile Devices

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Selection of test materials in subjective assessment methodology recommendations is based mainly on technical parameters. Materials should test the ability of the codec to cope with spatial and temporal redundancy. However consumers watch TV for a reason -one of the main criteria is the interesting content. In this study we examined whether the content recognition and subjects' personal interests have an effect on quality assessment. We also studied subjective assessment criteria for video quality. The study was done using small resolution and low bit rate video in mobile phones in a laboratory environment. Altogether 135 subjects, aged 18-65 years, participated in the tests. The test started with a subjective assessment of video quality using well-known TV content. Afterwards a survey was done to measure content recognition and level of interests in the content. The test session ended up with a qualitative interview about evaluation criteria. Our studies showed that there is a connection between interest in content and given quality score with TV content. Therefore we raise a concern on content selection and recommend measuring the evaluator's interest in content in subjective assessment studies. The study on subjective evaluation criteria revealed that subjects pay attention on content and quality impairments especially in regions of interest.

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“…This therefore shows that the user experience of using small screened devices is not necessarily detrimentally affected, if the content is appropriately tailored according to perceptuallocation and technical requirements. On the other hand, when comparing the results obtained from the study described in this paper, with that of a control group, in which no tailoring took place [10], analysis revealed statistically significant influences of experiment type and device type on user overall QoP (QoP was higher in the tailored scenario), thus highlighting the benefits of streaming perceptually tailored multimedia content.…”

Section: Results Summarymentioning

confidence: 77%

Integrating Perceptual, Device and Location Characteristics for Wireless Multimedia Transmission

Şerif

Ghinea

Fongen³

2007

2007 2nd International Symposium on Wireless Pervasive Computing

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Abstract-In this paper,we describe an investigation exploring user experiences of accessing streamed multimedia content, when that content is tailored according to perceptual, device and location characteristics. To this end, we have created pre-defined transmission profiles and stream perceptually tailored multimedia content to three different locations, each characterised by different infotainment requirements. In the light of our results, we propose that multimedia transmission to mobile and wireless devices should be made based on pre-defined profiles, which contains a combination of static (perceptual, device type, CPU speed, and display specifications) and dynamic information (streamed content type location of the device/user, context of the device/user). The evaluation of such a system showed that the users and service providers can gain from such an approach considerably, as user perceptions of quality were not detrimentally affected by QoS degradations. Consequently, service providers can utilise this information to effectively manage local network traffic and bandwidth.

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Pervasive and standalone computing: the perceptual effects of variable multimedia quality

Cited by 27 publications

References 52 publications

Experienced quality factors: qualitative evaluation approach to audiovisual quality

Experienced quality factors: qualitative evaluation approach to audiovisual quality

<title>Effect of TV content in subjective assessment of video quality on mobile devices</title>

Integrating Perceptual, Device and Location Characteristics for Wireless Multimedia Transmission

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