Quality of Experience Research Papers (original) (raw)

Video quality estimation is crucial for the efficient management of video delivery services. Particularly with the advances in screen technology and content delivery networks, getting an accurate estimation of the video quality as it is... more

Video quality estimation is crucial for the efficient management of video delivery services. Particularly with the advances in screen technology and content delivery networks, getting an accurate estimation of the video quality as it is actually perceived by the user, is a key factor in delivering high quality-of-experience. Psychometric scaling provides the tools to measure the impact that different types of impairments have on the delivered quality. In contrast to the more conventional subjective rating procedures, psychometric scaling does not suffer from biases and has significantly lower variability. However, the existing psychometric methods such as Maximum Likelihood Difference Scaling (MLDS) entail a large number subjective tests. Herein we present an adaptive approach that leads to improvement in the learning rate and, in turn, to resource-efficient video delivery systems.

In this paper we present the case for using specifically configured protocol stacks geared towards human requirements in the delivery of distributed multjmedia. We define &a& of /'c~cep/io/t (QoP) as representing the user side of the more... more

In this paper we present the case for using specifically configured protocol stacks geared towards human requirements in the delivery of distributed multjmedia. We define &a& of /'c~cep/io/t (QoP) as representing the user side of the more technical and traditional Quality of Service (QoS). QoP is a term \vhich cnco~~~passes not only a user's satisfaction with the quality of multimcdiu presentations, but also his/her ability to analyse, synthcsise and asstmilate the informational content of multimedia displays. The lI~~r~r~rr~~/!)/ Recoqfigurable Protocol Studs (DROPS) architecture supports low cost reconfiguration of tndividual protocol mechanisms in an attempt to best maintain QoP in connections where the provided QoS fluctuates unpredictably, Results show that DROPS can be used to improve on the QoP provided by legacy protocol stacks (TCP/IP, UDPIIP), cspccially in the cast of dynamic and complex sequences.

Wireless Internet access has brought legions of heterogeneous applications all sharing the same resources. However, current wireless edge networks that cater to worst or average case performance lack the agility to best serve these... more

Wireless Internet access has brought legions of heterogeneous applications all sharing the same resources. However, current wireless edge networks that cater to worst or average case performance lack the agility to best serve these diverse sessions. Simultaneously, software reconfigurable infrastructure has become increasingly mainstream to the point that dynamic per packet and per flow decisions are possible at multiple layers of the communications stack. Exploiting such reconfigurability requires the design of a system that can enable a configuration, measure the impact on the application performance (Quality of Experience), and adaptively select a new configuration. Effectively, this feedback loop is a Markov Decision Process whose parameters are unknown. The goal of this work is to design, develop and demonstrate QFlow that instantiates this feedback loop as an application of reinforcement learning (RL). Our context is that of reconfigurable (priority) queueing, and we use the p...

Providing real-time traffic guarantees and fairness based on the availability of network resources has been a major issue presented in the literature. However, due the convergent nature of digital architectures, the increasing demand of... more

Providing real-time traffic guarantees and fairness based on the availability of network resources has been a major issue presented in the literature. However, due the convergent nature of digital architectures, the increasing demand of upcoming real-time sensitive traffic, such as VoIP, and a higher user´s adaptability (devices, global positioning, content quality, etc.), solutions based on Quality of Service (QoS) turned out to be insufficient in order to meet user´s requirements. Indeed, QoS metrics are network-centered, and mostly related to the dynamic nature of the traffic (such as throughput, delay, jitter, among others). In order to meet the need for a user-centered network, this paper proposes a context-aware solution where the concepts of Quality of Service, Quality of Experience and Adaptive Routing are integrated in order to provide a more dynamic and pro-active approach for the delivery of context-oriented time-sensitive traffic.

The present paper investigates multifactor audiovisual-content quality evaluation strategies, in mediated communication. The primary aims of the work are to identify, describe and model the mechanisms that the attributes of source content... more

The present paper investigates multifactor audiovisual-content quality evaluation strategies, in mediated communication. The primary aims of the work are to identify, describe and model the mechanisms that the attributes of source content and its encoding properties influence the communication process and the involved emotional aspects in terms of Quality of Experience (QoE), information perception and understanding. Mediated learning constitutes a demanding thus suitable investigation case-study, where communication efficiency can be monitored with the use of applicable Quality of Learning (QoL) parameters, such as the learning outcome and its relation to the prior knowledge status. Real-world e-learning scenarios are utilized for sentiment analysis tests combined with QoE/QoL evaluation, using both subjective scores and perceptually-adapted metrics. This experimental research attempts to monitor communication efficiency and its relation to the quality and emotional impact of the mediated content, offering new insights in mediated learning and broader audiovisual communication services.

The present paper focuses on the extraction and evaluation of salient audiovisual features for the prediction of the encoding requirements in audiovisual content. Recent research showed that encoding decisions can be really crucial during... more

The present paper focuses on the extraction and evaluation of salient audiovisual features for the prediction of the encoding requirements in audiovisual content. Recent research showed that encoding decisions can be really crucial during audiovisual mediated communication, where poor encoding may lead to unaccepted Quality of Experience (QoE) or even to the creation of negative emotional response. In contrast, exaggerated high quality encoding may create increased bandwidth demands that are associated with annoying delays and irregular playback flow, resulting again in QoE degradation with similar emotional repulsion. Thus, there has to be a careful treatment with proper encoding balance during the production and deployment of mediated communication audiovisual resources. Such machine-assisted creativity is investigated in the current work, with the utilization of applicable audiovisual features, QoE metrics and emotional measures, aiming at implementing intelligent models for optimal audiovisual production and encoding configuration in demanding mediated communication applications and services.

— The availability of affordable head-mounted displays has resulted in renewed interest in augmented reality (AR) and virtual reality (VR). This in turn has led to research into users' perceptions of quality in AR and VR environments. In... more

— The availability of affordable head-mounted displays has resulted in renewed interest in augmented reality (AR) and virtual reality (VR). This in turn has led to research into users' perceptions of quality in AR and VR environments. In this paper, the authors report the results of an experimental study that compared the user quality of experience (QoE) of an interactive and immersive speech and language assessment implemented in both AR and VR. To the best of the authors' knowledge, this is the first work that compares user QoE of VR and AR applications, in particular with a focus on applications in the speech and language domain. Subjective and objective data was captured to assess a user's QoE. Objective data, such as heart rate and electrodermal activity (EDA) was collected using consumer electronic devices such as the Fitbit and the PIP biosensor. Subjective data was captured using a user's self-reported ratings in a post-test questionnaire. The findings of this study demonstrate similar QoE ratings for both the AR and VR environments. The findings also suggest that users acclimatized to the AR environment more quickly than the VR environment.

This exploratory study examined perceptions of care quality within parent-pay youth treatment programmes such as therapeutic boarding schools, residential treatment centres, wilderness therapy programmes, and intensive outpatient... more

This exploratory study examined perceptions of care quality within parent-pay youth treatment programmes such as therapeutic boarding schools, residential treatment centres, wilderness therapy programmes, and intensive outpatient programmes. Reflecting on their personal experiences as youths, 214 adults reported on a total of 75 different treatment settings. Two indices developed for this study measured par-ticipants' perceptions of quality of experience and the totalistic programme characteristics of their care settings. Regression analyses and ANOVA tests of means indicated a negative relationship between totalistic programme characteristics and quality of experience index scores. Significant relationships were not found between quality of experience and forcible transport, intake decade, or the amount of time in treatment.

In the recent years, different contributions have been proposed in the literature in order to provide real-time traffic guarantees and fairness concerning the utilization of network resources. Nevertheless, QoS has been proven... more

In the recent years, different contributions have been proposed in the literature in order to provide real-time traffic guarantees and fairness concerning the utilization of network resources. Nevertheless, QoS has been proven insufficient in order to meet user´s expectations considering the delivery of real-time sensitive traffic. QoS metrics are network-centered, and mostly related to the dynamic nature of the network (such as bandwidth, delay, jitter, among others). In order to meet the need for a user-centered network, this paper proposes a context-aware framework where the concepts of Quality of Service, Quality of Experience and Adaptive Routing are revisited in order to provide a more dynamic and pro-active solution for rerouting time-sensitive traffic.

Quality of Service (QoS) and Quality of Experience (QoE) are considered key performance indicators of video and audio conference performance of video call streaming service. Since Skype operates and evolves around the scope of achieving... more

Quality of Service (QoS) and Quality of Experience (QoE) are considered key performance indicators of video and audio conference performance of video call streaming service. Since Skype operates and evolves around the scope of achieving best possible quality service across all available operative environments, it is important to investigate and examine how Skype has evolved around this cross platform scope, what kind of encoding improvements have been implemented through years and how efficient are all these changes, objectively and subjectively.

This paper presents an enhanced objective method for VoIP quality evaluation. However, instead of improving the original E-model for G.729, the Simplified E-model has been enhanced using subjective MOS estimation model based-on Thai... more

This paper presents an enhanced objective method for VoIP quality evaluation. However, instead of improving the original E-model for G.729, the Simplified E-model has been enhanced using subjective MOS estimation model based-on Thai users, who used Thai-tonal language. The different results from Simplified E-model and subjective MOS estimation model have been used to create the equation called Bias equation, before adding to the Simplified E-model. Based-on the assumption that subjective voice quality evaluation for VoIP is the most authentic and reliable, the results from the enhanced simplified E-model for G.729 show better accuracy when compared to the original simplified E-model obviously.

... Network Quality of Experience ... Abstract—As the service requirements of network applications shift from high throughput to high media quality, interactivity, and responsiveness, the definition of QoE (Quality of Experience) has... more

... Network Quality of Experience ... Abstract—As the service requirements of network applications shift from high throughput to high media quality, interactivity, and responsiveness, the definition of QoE (Quality of Experience) has become multidimensional. ...

Vasileios Komianos -1, Athanasios Tsipis -2, Katerina Kontopanagou -3 Abstract—Recent advances in three-dimensional (3D) media delivery technologies, such as Augmented and Mixed Reality, have paved the way towards the realization of... more

Vasileios Komianos -1, Athanasios Tsipis -2, Katerina Kontopanagou -3
Abstract—Recent advances in three-dimensional (3D) media delivery technologies, such as Augmented and Mixed Reality, have paved the way towards the realization of high-quality immersive experiences in digital culture applications. Nowa- days, these services play a crucial role in cultural heritage dissemination, transforming visitors from passive spectators into proactive culture caretakers and content creators. Nevertheless, they demand significant computational resources and are subject to low delay tolerances, that are generally difficult to acquire via standard mobile devices. Under this scope, the current paper deals with the preliminary design of a hybrid cloud/edge com- puting platform for the support of digital culture applications. The goal is to recognize computationally intensive services that are to be offloaded based on their resource and time criticality to the cloud or edge respectively, and offer constant guarantees regarding the visitors’ Quality of Experience. The use case of Byzantine Monuments and Churches is also reported to better contextualize the approach and present the platform’s layering and data flow.
Index Terms—cloud/edge computing, computational offloading, digital culture, immersive experiences, quality of experience, virtual/augmented/mixed reality

MAIN TEXT In reading O'Regan and Noe's paper two major concerns are mandatory. First it is difficult to see in what respect the authors' standpoint is different from functionalism, second it is difficult to define... more

MAIN TEXT In reading O'Regan and Noe's paper two major concerns are mandatory. First it is difficult to see in what respect the authors' standpoint is different from functionalism, second it is difficult to define objectively what sensory motor contingency (SMC in the following) is ...