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Decision support systems increasingly support experts' work, but errors caused by them may have severe consequences, especially in the medical domain. To better understand how these inaccuracies affect experts' behavior and decisions, a quality of context model was constructed. Based on the model a controlled online experiment was conducted in which physicians had to treat hypothetical cases while...
The new coding tools, developed under the Joint Exploration Model (JEM) software, have been proposed with the main goal to explore their potential coding gain in the perspective to develop a new video coding standard. In this paper we present a performance-based comparison between the JEM and HEVC reference software (HM) through a set of subjective quality assessments. Different video sequences, encoded...
No-Reference (NR) Video Quality Assessment (VQA) is a challenging task since it predicts the visual quality of a video sequence without comparison to some original reference video. Several NR-VQA methods have been proposed. However, all of them were designed and tested on databases with artificially distorted videos. Therefore, it remained an open question how well these NR-VQA methods perform for...
In recent years, virtual reality products have found their way into our life. They have changed our entertainment experience in many ways, including the way people consume adult entertainment. With the immersion and presence offered by VR technologies, a new level of user experience in adult entertainment might be possible. To explore these possibilities, we conducted a qualitative user study with...
In order to provide attractive content, it is important to design and manage services based on users' Quality of Experience (QoE). In recent years, researchers in the field have been increasingly focusing on the biological information approach. In this paper, we examine the relationship between the change in the hemodynamic response of blood in the frontal lobe of the brain and the preference of images...
Crowdsourcing has established itself as a powerful tool to collect human input for data acquisition and labeling. Conventional laboratory experiments can now be addressed to a wider and diverse audience. This paper presents a study performed both in a laboratory and on a mobile-crowdsourcing platform, adopting a paired-comparison setup to obtain ratings of voice likability. We show considerations...
Enabling high Quality of Experience (QoE) with video-conferencing solutions based on Web Real-Time Communication (WebRTC) protocols anywhere, anytime, is challenging and triggers the exploration of new ways to gain QoE insights. In this paper, we share initial observations from a within-subjects experiment (N = 22) in which 2-party WebRTC-based audiovisual conversations took place under varying technical...
This paper presents a novel Long Term Evolution (LTE) mobile wireless testbed for streaming multimedia Quality of Experience (QoE) experimentation. The software-radio based design of the testbed provides an extremely flexible architecture which offers detailed insights into all elements of the entire LTE network protocol stack from physical to application layer. With the testbed, we aim to bridge...
Today most internet traffic is generated by video streaming. YouTube and other video streaming platforms are using encrypted streams (HTTPS) for transport of video content. Encryption will lead to more requirements on network and content providers, e.g. caching mechanisms will not work direct. Estimation of video quality for measuring users satisfaction is also harder because there is no direct access...
In this paper a no-reference image quality assessment (IQA) metric for DIBR-synthesized images is proposed. Sparsity based features of morphologically decomposed image subbands are used to estimate distortion level in images. A General regression neural network is utilized to calculate quality score. The performance is evaluated using publicly available IRCCyN/IVC DIBR image database. Experimental...
Recent advances in Virtual Reality (VR) technologies have resulted in a wider availability of Head Mounted Displays (HMDs). However, it is still unclear if VR gaming offers a substantial added value to players. For this reason a comparison of gaming experiences on VR HMD to those on mobile and PC, two other popular gaming platforms, is performed by conducting a user study via two games available on...
In this paper, telephone conversation test results are reported. The main goal of the research is to derive a quality assessment model for today's Voice over Internet Telephony (VoIP) communication including the influence of end-point terminals with their internal signal processing. For this reason, two different terminals were used during the test and a possibly wide range of impairments were simulated,...
Similar to many modern applications, enterprise applications like SAP are often implemented in a distributed fashion and consequently suffer from network degradations resulting in impairments like increased loading delays. While the influence of these impairments on the perceived quality of users is well researched for consumer applications and network services, their impact in a business environment...
We performed a user study in which we investigated the user experience of HoloBee, a visual analytics system for the exploration of bee drift data. We compared two user interfaces, a head-mounted augmented reality (aR) interface and a desktop interface. We present here a correlation analysis of the user experience ratings that we collected in a questionnaire: intuitive, easy to use, comfortable, natural,...
Omnidirectional video encoding and delivery are rapidly evolving fields, where choosing an efficient representation for storage and transmission of pixel data is critical. Given that there are a number of projections (pixel representations), a projection independent measure is needed to evaluate the merits of different options. We present a technique to evaluate projection quality by rendering virtual...
For an accurate assessment of media quality, it is essential not only to compute an overall quality measure, but also to identify the type of occurring distortions. In this paper, we focus on a set of no-reference single-artifact based metrics developed by the MOAVI project. We carried out a correlation analysis in order to evaluate the performance of these metrics on three databases with a large...
Point clouds have emerged as a promising solution for immersive representation of 3D contents. In this paper an interactive subjective quality assessment for point clouds is proposed. Quality assessment of geometry information in point clouds subject to realistic types of degradations is performed and correlation between state-of-the-art objective metrics and ground truth subjective scores is investigated...
This paper proposes a new method for evaluating real-time binaural reproduction systems by means of a wayfinding task in six degrees of freedom. Participants physically walk to sound objects in a virtual reality created by a head-mounted display and binaural audio. We show how the localization accuracy of spatial audio rendering is reflected by objective measures of the participants' behavior. The...
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