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  • 1.
    Andrén, Börje
    et al.
    RISE, Swedish ICT, Acreo.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo.
    Wang, Kun
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Readability of displays in bright outdoor surroundings SID Symposium Digest of Technical Papers2014In: SID Display Week 2014, 2014, p. 1100-1103Conference paper (Refereed)
    Abstract [en]

    Readability of displays in bright outdoor surroundings is a problem for many types of visual displays. The wide range of lighting conditions that these displays should be able to operate in, makes the design of the test set-up very challenging. Mobile displays of today usually have LCDs with LED backlight or OLEDs, which gives the possibility to control the light levels from very low luminance or even zero luminance to very high luminance levels with good contrast and color rendering. There are many displays that can show high luminance (>1000 cd/m2) and with that are considered or claimed to have daylight or sunlight readability. However, these statements are rarely supported by scientific tests with test subjects. This paper will discuss and analyze the conditions for performing such experiments. Experimental results that the visual acuity is negatively affected by strong illuminance are presented.

  • 2.
    Andrén, Börje
    et al.
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Wang, K
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Rydell, N
    Fuller, S
    A comparison of visual ergonomic measurements between active and passive 3DTV2011In: EURODISPLAY 2011, 2011Conference paper (Refereed)
  • 3.
    Andrén, Börje
    et al.
    RISE, Swedish ICT, Acreo.
    Wang, Kun
    RISE, Swedish ICT, Acreo.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo.
    Characterizations of 3D TV: Active vs passive2012Conference paper (Refereed)
  • 4.
    Brunnström, Kjell
    et al.
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Ananth, Indirajith Vijai
    RISE, Swedish ICT, Acreo.
    Hedberg, Christer
    RISE, Swedish ICT, Acreo.
    Wang, Kun
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Barkowsky, Marcus
    University of Nantes, France.
    Comparison between different rating scales for 3D TV2013In: Digest of Technical Papers - SID International Symposium, ISSN 0097-966X, Vol. 44, no 1, p. 509-512Article in journal (Refereed)
    Abstract [en]

    Stereoscopic 3D viewing experience has been studied quite intensively recently, but still the subjective test methods have not yet been settled. It has become clear that the 3D viewing experience cannot easily be described by just one scale. This paper describes a study where three different rating scales (Quality, Discomfort and Presence) are compared in a subjective test, combined with two viewing distances. The results shows that in a stereoscopic 3D video quality test targeting mainly coding distortions one scale such as video quality could be sufficient.

  • 5.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Schenkman, Bo
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Hamsis, Omar
    RISE Research Institutes of Sweden, Digital Systems, Prototyping Society.
    Recommended precautions because of Covid-19 for perceptual, behavioural,quality and user experience experimentswith test persons in indoor labs2020Report (Other academic)
    Abstract [en]

    Based on the recommendations from the Public Health Agency of Sweden(Folkhälsomyndigheten; FHM) and a set of internal rules from RISE, the followingrules are published for how to conduct experiments involving test persons in the timesof the pandemic Covid-19. The recommendations are for non-invasive and non-medicaltests, e.g. perceptual, consumer, ergonomic and human-computer interaction teststaking place in an indoor laboratory.

    Specifically, in this document we are specifying how experiments with test personstargeting audio and visual presentations should be done considering necessaryprecautions imposed by the Covid-19 pandemic. Laboratory experiments with testpersons, as it involves inviting people to the lab, require particular planning and carefulconsideration, if they are to be carried out safely because of the risks imposed by theCovid-19 pandemic. The safety aspects are valid for both the invited test persons andare equally important for the health of the test leaders.

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  • 6.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Objective video quality assessment methods for Video assistant refereeing (VAR) Systems2021Report (Other academic)
    Abstract [en]

    This report describes the work and conclusions drawn after phase 4 in the project “Assessment methods for Video assistant refereeing (VAR) System”.

    The performance of six different video quality models have been evaluated, that were identified during phase 1, against the subjective video quality database that was created during phase 3. The results are slightly different for 1080p compared to 1080i. For 1080p the models VQM_VFD, SSIM and VMAF performs the best with Pearson Correlation Coefficients (PCC) above 0.9. For 1080i the PCC drops a bit overall and then VMAF and VQM_VFD are close in performance and performing the best. The overall performance for both formats VMAF an VQM_VFD stands out as the best models. In this comparison VQM_VFD has the added advantage to also be able to perform its own registration i.e. to fix any misalignment between the reference video and the distorted one.

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  • 7.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Objective video quality assessment methods for Video assistant refereeing (VAR) System: Phase 4 report on synchronizationand latency measurements2021Report (Other academic)
    Abstract [en]

    This report describes the work and conclusions drawn after phase 4 for the synchronization and latencymeasurements in the project “Assessment methods for Video Assistant Refereeing (VAR) System”.In phase 4, we have focused on up-dating the software so that it automatically detects: p (progressive),i (interlaced), and PsF (progressive segmented frame) formats and analyse the different video types. Wehave also the performed a field-test with an OB-van at an arena.

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  • 8.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Video quality based on a user study with video professionals for Video Assisted Refereeing (VAR) Systems2021Report (Other academic)
    Abstract [en]

    This document describes a user experiment with the purpose of finding a baseline quality that is suitable for system and a database for training and evaluating the objective quality measurement methods suitable for assessing the video quality of VAR systems. 

    A user experiment was performed involving 25 Swedish video experts. Three different video formats were incorporated 1080p, 1080i and 540i. The degradations were in most cased done using encoding with Motion JPEG (MJPEG) and H.264 in the bitrate range from 80 Mbit/s down to 10 Mbit/s. 

    MJPEG loses quality very fast and already at 80 Mbit/s it has significantly lower quality than the uncompressed reference and then for even lower bitrates the quality falls quickly to bad. On the other hand, H.264 was not found to be significant different from the uncompressed reference until the bitrate had dropped to 10 Mbit/s for 1080p. For 1080i 20 Mbit/s was also weakly and for 540i 20 Mbit/s was significantly lower for some of the scaling methods. For 1080i the deinterlacing requires careful consideration, since the deinterlacing scheme introduced received very low quality scores. For the scaling scheme lanczos was the best and bilinear the worst. 

    Requirement levels on bitrate and the encoders MJPEG and H.264 based on this experiment•    MJPEG require more than 120 Mbit/s•    H.264 require more than 50 Mbit/s

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  • 9.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Billingham, Johsan
    FIFA Fédération Internationale de Football Association, Switzerland.
    Wistel, Katharina
    FIFA Fédération Internationale de Football Association, Switzerland.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Evans, Nicolas
    FIFA Fédération Internationale de Football Association, Switzerland.
    Video expert assessment of high quality video for Video Assistant Referee (VAR): A comparative study2023In: Multimedia tools and applications, ISSN 1380-7501, E-ISSN 1573-7721Article in journal (Refereed)
    Abstract [en]

    The International Football Association Board decided to introduce Video Assistant Referee (VAR) in 2018. This led to the need to develop methods for quality control of the VAR-systems. This article focuses on the important aspect to evaluate the video quality. Video Quality assessment has matured in the sense that there are standardized, commercial products and established open-source solutions to measure it with objective methods. Previous research has primarily focused on the end-user quality assessment. How to assess the video in the contribution phase of the chain is less studied. The novelties of this study are two-fold: 1) The user study is specifically targeting video experts i.e., to assess the perceived quality of video professionals working with video production. 2) Six video quality models have been independently benchmarked against the user data and evaluated to show which of the models could provide the best predictions of perceived quality. The independent evaluation is important to get unbiased results as shown by the Video Quality Experts Group. An experiment was performed involving 25 video experts in which they rated the perceived quality. The video formats tested were High-Definition TV both progressive and interlaced as well as a quarters size format that was scaled down half the size in both width and height. The videos were encoded with both H.264 and Motion JPEG for the full size but only H.264 for the quarter size. Bitrates ranged from 80 Mbit/s down to 10 Mbit/s. We could see that for H.264 that the quality was overall very good but dropped somewhat for 10 Mbit/s. For Motion JPEG the quality dropped over the whole range. For the interlaced format the degradation that was based on a simple deinterlacing method did receive overall low ratings. For the quarter size three different scaling algorithms were evaluated. Lanczos performed the best and Bilinear the worst. The performance of six different video quality models were evaluated for 1080p and 1080i. The Video Quality Metric for Variable Frame Delay had the best performance for both formats, followed by Video Multimethod Assessment Fusion method and the Video Quality Metric General model. 

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  • 10.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Billingham, Johsan
    FIFA Fédération Internationale de Football Association, Switzerland.
    Wistel, Katharina
    FIFA Fédération Internationale de Football Association, Switzerland.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. KTH Royal Institute of Technology, Sweden.
    Evans, Nicolas
    FIFA Fédération Internationale de Football Association, Switzerland.
    Video quality of video professionals for Video Assisted Referee (VAR)2023In: IS and T International Symposium on Electronic Imaging Science and Technology, ISSN 2470-1173, Vol. 35, no 10, article id 259Article in journal (Refereed)
    Abstract [en]

    Changes in the footballing world’s approach to technology and innovation contributed to the decision by the International Football Association Board to introduce Video Assistant Referees (VAR). The change meant that under strict protocols referees could use video replays to review decisions in the event of a "clear and obvious error" or a "serious missed incident". This led to the need by Fédération Internationale de Football Association (FIFA) to develop methods for quality control of the VAR-systems, which was done in collaboration with RISE Research Institutes of Sweden AB. One of the important aspects is the video quality. The novelty of this study is that it has performed a user study specifically targeting video experts i.e., to measure the perceived quality of video professionals working with video production as their main occupation. An experiment was performed involving 25 video experts. In addition, six video quality models have been benchmarked against the user data and evaluated to show which of the models could provide the best predictions of perceived quality for this application. Video Quality Metric for variable frame delay (VQM_VFD) had the best performance for both formats, followed by Video Multimethod Assessment Fusion (VMAF) and VQM General model.

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  • 11.
    Brunnström, Kjell
    et al.
    RISE, Swedish ICT, Acreo.
    Tavakoli, S
    Kulyk, V
    RISE, Swedish ICT, Acreo.
    Wang, Kun
    RISE, Swedish ICT, Acreo.
    Hedberg, Christer
    RISE, Swedish ICT, Acreo.
    Ananth, IV
    RISE, Swedish ICT, Acreo.
    Hussein, M
    RISE, Swedish ICT, Acreo.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Folkesson, M
    Barowski, M
    RISE, Swedish ICT, Acreo.
    3D Video Quality of Experience - Influence of Scale and Crosstalk Invited2014Conference paper (Refereed)
    Abstract [en]

    This paper gives an overview of three recent studies by the authors on the topic of 3D video Quality of Experience (QoE). Two of studies [1,2] investigated different psychological dimension that may be needed for describing 3D video QoE and the third the visibility and annoyance of crosstalk[3]. The results shows that the video quality scale could be sufficient for evaluating S3D video experience for coding and spatial resolution reduction distortions. It was also confirmed that with a more complex mixture of degradations more than one scale should be used to capture the QoE in these cases. The study found a linear relationship between the perceived crosstalk and the amount of crosstalk.

  • 12.
    Brunnström, Kjell
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. Mid Sweden University, Sweden.
    Wang, Kun
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Tavakoli, Samira
    Universidad Politecnica de Madrid, Spain.
    Andrén, Börje
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Symptoms analysis of 3D TV viewing based on Simulator SicknessQuestionnaires2017In: Quality and User Experience, ISSN 2366-0139, E-ISSN 2366-0147, Vol. 2Article in journal (Refereed)
    Abstract [en]

    Stereoscopic 3D TV viewing puts differentvisual demands on the viewer compared to 2D TV viewing.Previous research has reported on viewers’ fatigue anddiscomfort and other negative effects. This study is toinvestigate further how severe and what symptoms mayarise from somewhat longish 3D TV viewing. The MPEG3DV project is working on the next-generation videoencoding standard and in this process, MPEG issued a callfor proposal of encoding algorithms. To evaluate thesealgorithms a large scale subjective test was performedinvolving Laboratories all over the world [(MPEG 2011;Baroncini 2012)]. For the participating Labs, it wasoptional to administer a slightly modified Simulator SicknessQuestionnaire (SSQ) before and after the test. One ofthe SSQ data sets described in this article is coming fromthis study. The SSQ data from the MPEG test is the largestdata set in this study and also contains the longest viewingtimes. Along with the SSQ data from the MPEG test, wehave also collected questionnaire data in three other 3D TVstudies. We did two on the same 3D TV (passive filmpattern retarder) as in the MPEG test, and one was using aprojector system. As comparison SSQ data from a 2Dvideo quality experiment is also presented. This investigationshows a statistically significant increase in symptomsafter viewing 3D TV primarily related to the visual or Oculomotor system. Surprisingly, 3D video viewing usingprojectors did not show this effect.

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  • 13.
    De Moor, Katrien
    et al.
    NTNU Norwegian University of Science and Technology, Norway; Ghent University, Belgium.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Guo, Yi
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Brunnström, Kjell
    Mid Sweden University, Sweden.
    Wang, Kun
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Drott, Anton
    Volvo Cars AB, Sweden.
    Hermann, David
    Volvo Cars AB, Sweden.
    Influence of high ambient illuminance and display luminance on readability and subjective preference2015In: Human Vision and Electronic Imaging XX, 2015, Vol. 9394, article id 93941EConference paper (Refereed)
    Abstract [en]

    Many devices, such as tablets, smartphones, notebooks, fixed and portable navigation systems are used on a (nearly) daily basis, both in in- and outdoor environments. It is often argued that contextual factors, such as the ambient illuminance in relation to characteristics of the display (e.g., surface treatment, screen reflectance, display luminance...) may have a strong influence on the use of such devices and corresponding user experiences. However, the current understanding of these influence factors is still rather limited. In this work, we therefore focus in particular on the impact of lighting and display luminance on readability, visual performance, subjective experience and preference. A controlled lab study (N=18) with a within-subjects design was performed to evaluate two car displays (one glossy and one matte display) in conditions that simulate bright outdoor lighting conditions. Four ambient luminance levels and three display luminance settings were combined into 7 experimental conditions. More concretely, we investigated for each display: (1) whether and how readability and visual performance varied with the different combinations of ambient luminance and display luminance and (2) whether and how they influenced the subjective experience (through self-reported valence, annoyance, visual fatigue) and preference. The results indicate a limited, yet negative influence of increased ambient luminance and reduced contrast on visual performance and readability for both displays. Similarly, we found that the self-reported valence decreases and annoyance and visual fatigue increase as the contrast ratio decreases and ambient luminance increases. Overall, the impact is clearer for the matte display than for the glossy display.

  • 14.
    Eksvärd, Siri
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Falk, Julia
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Schenkman, Bo
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Evaluating Speech-to-Text Systems and AR-glasses: A study to develop a potential assistive device for people with hearing impairments2021Report (Other academic)
    Abstract [sv]

    Att ha en hörselskada eller att vara döv har flera konsekvenser på individens livskvalité. Det påverkar vardagen i stor utsträckning och gör det svårt att delta i konversationer. Det finns redan flera hjälpmedel för att underlätta vardagen för individer med hörselskador, exempelvis  hörapparater. Dock finns vissa utmaningar och problem med dessa. En möjlig lösning skulle kunna vara att använda Augmented Reality, eller förstärkt verklighet tillsammans med ett tal-till-text-system, där tal skulle kunna konverteras til text som exempelvis presenteras i AR-glasögon. Augmented Reality (AR) är en teknik som möjliggör att förstärka verkligheten genom att  datorgenerande information, till exempel visuella objekt, presenteras ovanpå verkligheten. En variant av en AR-teknologi är AR-glasögon, vilket innebär att datorgenerade objekt presenteras i glasögonen och sedermera förstärker användarens verklighet. Olika varianter av AR och AR-glasögon har studerats länge, men det inte förrän under den senaste tiden som kvalitén blivit tillräckligt bra för att kunna användas i vardagen. Idag finns flera olika AR-glasögon, med olika tekniska, ergonomiska, visuella och optiska egenskaper, där vissa glasögon kan vara mer eller mindre lämpade inom ett visst användningsområde. Glasögonens egenskaper påverkar även användarens upplevelse. Även om tekniken redan finns på marknaden kvarstår vissa problem, exempelvis belysning, bakgrund och att synligheten av de datorgenerade objekten påverkas av förhållanden i omgivningen. Då målet är att presentera text i AR-glasögonen är det viktiga att texten är synlig, läslig1 och läsbar2 under flera olika förhållanden, som varierande belysning och bakgrund. Dessutom bör hänsyn tas till hur texten presenteras, där faktorer som storlek, textfärg, bakgrundsfärg bakom text samt antal rader bör beaktas. Tal-till-text-system är också en teknik som fått genomslag under de senaste åren. Bland annat tack vare de stora framsteg som gjorts inom taligenkänning. På den engelskspråkiga marknaden är tekniken utbredd och det finns flera befintliga system, som Google Cloud Speech API, IBM Watson och Microsoft Azure. På den svenska marknaden finns dock få system och utvärderingar av dessa. Vid utvärderingar av tal-till-text-system bör man ta hänsyn till faktorer som korrekthet, fördröjning och robusthet under olika ljudnivåer, talhastigheter och dialekter. Således bör man utvärdera vilket svenskt tal-till-text-system som är lämpligast att använda för att översätta tal till text med hänsyn till ovannämnda aspekter. I detta examensarbete undersöks hur egenskaperna i två olika AR-glasögon påverkar användarupplevelsen med fokus på komfort, design, samt glasögonens optiska och visuella egenskaper. Vidare undersöks hur belysning och bakgrund påverkar läsligheten och läsbarheten av text, samt hur texten ska presenteras för att resultera i bäst läslighet och läsbarhet. Detta studeras genom användartester, där olika formateringar på texten presenteras under olika belysningar och med olika bakgrund. Detta följs av en kort enkät där deltagarna får besvara frågor gällande textformateringarna. Enkäten innehåller även frågor relaterade till glasögonens egenskaper och hur dessa påverkar användarupplevelsen för att kunna undersöka vilka glasögon som skulle vara mest lämpade för detföreslagna systemet. Avslutande genomförs en marknadsundersökning och litteraturundersökning över befintliga tal-till-text-system på den svenska marknaden. Resultatet från studien visar att belysning och bakgrund påverkar synligheten och sedermera läsligheten av texten som presenteras i glasögonen. Vidare påvisas det att textens formatering, med avseende på textfärg, textbakgrund, antal rader och storlek påverkar läsligheten. Resultatet visar även att AR-glasögonens egenskaper påverkar användarupplevelsen, läsligheten och läsbarheten. Vilka glasögon som är bäst lämpade tycks dock bero på individuella preferenser. Gällande tal-till-text-system, indentifieras fyra stycken som finns tillgängliga på den svenska marknaden. Utifrån utvärderingen av tillgängliga tal-till-text-system rekommenderas Google Cloud Speech API, baserat på tekniska egenskaper, robusthet och tillgänglighet.

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  • 15.
    Falk, Julia
    et al.
    RISE Research Institutes of Sweden.
    Eksvärd, Siri
    RISE Research Institutes of Sweden.
    Schenkman, Bo
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. KTH Royal Institute of Technology, Sweden.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Brunnström, Kjell
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Legibility and readability in Augmented Reality2021In: 2021 13th International Conference on Quality of Multimedia Experience (QoMEX), 2021, p. 231-236Conference paper (Refereed)
    Abstract [en]

    Digital technology offers multimodal presentation of information, that can be used for translating foreign languages or for alleviating hearing impairment or deafness communication problems. Today, there exists various aids that can be used for speech-to text translations, but there are some challenges with these. One potential solution for this is to make use of a combination of Augmented Reality (AR) and speech-to-text systems, where speech is converted into text that is then presented in AR-glasses. In AR, one crucial problem is the legibility and readability of text under different environmental conditions. Different types of AR glasses have different ergonomic characteristics, which implies that certain glasses might be more suitable for such a system than others. In this investigation, two different AR-glasses were evaluated based on among other things their optical, visual, and ergonomic characteristics. User tests were conducted to evaluate the legibility and readability of text under different environmental contexts. The results indicate that legibility and readability are affected by factors such as ambient illuminance, background properties and how the text is presented with respect to polarity, opacity, size, and number of lines. The characteristics of the glasses impacts the user experience, but which glasses that is preferred depends on the individual.

  • 16.
    Göreke, Hande
    et al.
    RISE Research Institutes of Sweden. Uppsala University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Schenkman, Bo
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. KTH Royal Institute of Technology, Sweden.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Hermann, David S.
    Volvo Car Corporation, Sweden.
    Brunnström, Kjell
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Perceptual Judgments of Simulated Low Temperatures in LCD based Vehicle Displays2023In: Digest of Technical Papers - SID International Symposium, John Wiley and Sons Inc , 2023, Vol. 54, no 1, p. 595-598Conference paper (Refereed)
    Abstract [en]

    A well-known drawback with LCD-displays in cold is a slow pixel response leading to poor picture quality. Low temperatures can constitute a hazard in viewing important displays in cars. Perceptual experiments with 20 test-persons were conducted to find clear and acceptable ranges on screens simulating distortions in low temperatures. The results showed perception over clear and acceptable image quality was impaired beyond -20°C for the LCD-screen in the experiments. 

  • 17.
    Hermann, David
    et al.
    Volvo Car Corporation AB, Sweden.
    Djupsjöbacka, Anders
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Andrén, Börje
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Brunnström, Kjell
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. Mid Sweden University, Sweden.
    Rydell, Niclas
    TCO Development AB, Sweden.
    Display panel certification system for the vehicle industry2017In: Digest of Technical Papers - SID International Symposium, 2017, Vol. 48, no 1, p. 471-474Conference paper (Refereed)
    Abstract [en]

    The ever-increasing need for displaying in-vehicle visual information in a non-distracting way requires a high visual performance of automotive displays. For their procurement, deep technical and supply-chain knowledge is required. Therefore, based on our comparisons of in-vehicle and laboratory visual-performance measurements, we propose a certification system for automotive display panels.

  • 18.
    Rizek, Hadi
    et al.
    RISE, Swedish ICT, Acreo.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Wang, Kun
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Johanson, Mathias
    Alkit Communications AB, Sweden.
    Subjective evaluation of a 3D videoconferencing system2014In: Proceedings of SPIE - The International Society for Optical Engineering, 2014Conference paper (Refereed)
    Abstract [en]

    A shortcoming of traditional videoconferencing systems is that they present the user with a flat, two-dimensional image of the remote participants. Recent advances in autostereoscopic display technology now make it possible to develop video conferencing systems supporting true binocular depth perception. In this paper, we present a subjective evaluation of a prototype multiview autostereoscopic video conferencing system and suggest a number of possible improvements based on the results. Whereas methods for subjective evaluation of traditional 2D videoconferencing systems are well established, the introduction of 3D requires an extension of the test procedures to assess the quality of depth perception. For this purpose, two depth-based test tasks have been designed and experiments have been conducted with test subjects comparing the 3D system to a conventional 2D video conferencing system. The outcome of the experiments show that the perception of depth is significantly improved in the 3D system, but the overall quality of experience is higher in the 2D system.

  • 19.
    Tavakoli, Samira
    et al.
    Universidad Politecnica de Madrid, Spain.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Wang, Kun
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Shahid, Muhammad
    Blekinge Institute of Technology, Sweden.
    Garcia, Narciso
    Universidad Politecnica de Madrid, Spain.
    Subjective quality assessment of an adaptive video streaming model2014In: Proceedings of SPIE - The International Society for Optical Engineering, 2014, Vol. 9016, article id 90160KConference paper (Refereed)
    Abstract [en]

    With the recent increased popularity and high usage of HTTP Adaptive Streaming (HAS) techniques, various studies have been carried out in this area which generally focused on the technical enhancement of HAS technology and applications. However, a lack of common HAS standard led to multiple proprietary approaches which have been developed by major Internet companies. In the emerging MPEG-DASH standard the packagings of the video content and HTTP syntax have been standardized; but all the details of the adaptation behavior are left to the client implementation. Nevertheless, to design an adaptation algorithm which optimizes the viewing experience of the enduser, the multimedia service providers need to know about the Quality of Experience (QoE) of different adaptation schemes. Taking this into account, the objective of this experiment was to study the QoE of a HAS-based video broadcast model. The experiment has been carried out through a subjective study of the end user response to various possible clients' behavior for changing the video quality taking different QoE-influence factors into account. The experimental conclusions have made a good insight into the QoE of different adaptation schemes which can be exploited by HAS clients for designing the adaptation algorithms.

  • 20.
    Wang, Kun
    et al.
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Hussain, Mahir
    RISE, Swedish ICT, Acreo.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Osterman, Jesper
    LC-Tec, Sweden.
    Perception and annoyance of crosstalk in stereoscopic 3D projector systems2014In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2014, Vol. 9011, article id 901125Conference paper (Refereed)
    Abstract [en]

    Crosstalk is a cause of a major perceptual problem in the 3D display system shown itself mostly as ghosting. In this work we aimed at investigating how much perceived crosstalk that is acceptable for the end-users in movie type contents played by 3D projection systems. Two types of 3D projection systems (one system using active shutter glasses, and the other system using passive polarized glasses) were compared in the experiment. The study included an objective measurement of crosstalk in the 3D projection system and a subjective users' experience of the visible distortions. The results shows that 10% can be considered as a crosstalk threshold for end-users not to be annoyed (MOS<3.5) by the distortions and thus acceptable. The distortions start to be perceived at about 3% crosstalk. The study found a linear relationship between perceived crosstalk and the amount of crosstalk. The perceived crosstalk also varies largely depending on the video contents.

  • 21.
    Wang, Kun
    et al.
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Barkowsky, Marcus
    University of Nantes, France.
    Urvoy, Matthieu
    University of Nantes, France.
    Sjöström, Mårten
    Mid Sweden University, Sweden.
    Le Callet, Patrick
    University of Nantes, France.
    Touranchea, Sylvain
    Mid Sweden University, Sweden.
    Andrén, Börje
    RISE, Swedish ICT, Acreo.
    Stereoscopic 3D video coding quality evaluation with 2d objective metrics2013In: Proceedings of SPIE - The International Society for Optical Engineering, 2013, Vol. 8648, article id 86481LConference paper (Refereed)
    Abstract [en]

    The 3D video quality is of highest importance for the adoption of a new technology from a user's point of view. In this paper we evaluated the impact of coding artefacts on stereoscopic 3D video quality by making use of several existing full reference 2D objective metrics. We analyzed the performance of objective metrics by comparing to the results of subjective experiment. The results show that pixel based Visual Information Fidelity metrics fits subjective data the best. The 2D stereoscopic video quality seems to have dominant impact on the coding artefacts impaired stereoscopic videos.

1 - 21 of 21
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