Filters








166 Hits in 5.8 sec

A comparison of non-experts and experts using DSIS method

Sugito Yasuko, Kusakabe Yuichi
2022 IS&T International Symposium on Electronic Imaging Science and Technology  
Furthermore, we investigated the differences between non-experts and experts by considering a new method in P.913 that estimates an improved MOS and a new experimental method using experts, called expert  ...  In this study, we conducted subjective evaluation experiments for nonexperts and experts on compressed 8K videos using the double stimulus impairment scale (DSIS) method and analyzed the experimental results  ...  Previously [3] , we statistically analyzed MOS values in three subjective evaluation results using the DSIS method (two non-expert and one expert datasets), investigated the differences in MOS values  ... 
doi:10.2352/ei.2022.34.11.hvei-131 fatcat:m3j4oicwhvfflcvpi7egkrh3ki

Rate-distortion and Rate-quality Performance Analysis of HEVC Compression of Medical Ultrasound Videos

Manzoor Razaak, Maria G. Martini
2014 Procedia Computer Science  
In this paper, medical ultrasound video sequences compressed via HEVC were subjectively assessed by medical experts and non-experts and the subjective scores obtained were then used to analyze the compression  ...  Therefore, it is important to analyse the compression performance of HEVC and its impact on the diagnostic and perceptual quality of medical videos.  ...  We would also like to thank the cardiologists at the University Hospital of Perugia, Italy, in particular Dr. Ketty Savino, Dr. Elisabetta Bordoni and Dr. Clara Riccini.  ... 
doi:10.1016/j.procs.2014.12.031 fatcat:6jilu5zn2vcarfkqjs3w3xuf3y

Video bit-rate requirements for 8K 120-Hz HEVC/H.265 temporal scalable coding: experimental study based on 8K subjective evaluations

Yasuko Sugito, Shinya Iwasaki, Kazuhiro Chida, Kazuhisa Iguchi, Kikufumi Kanda, Xuying Lei, Hidenobu Miyoshi, Kimihiko Kazui
2020 APSIPA Transactions on Signal and Information Processing  
From the analyses of the encoded videos, it is confirmed that the experimental results are primarily influenced by the image quality on the slice boundary positioned at the middle of the screen height.  ...  two types of experiments.  ...  caused by compression, i.e. experts tend to grade lower scores than non-experts for low-quality images.  ... 
doi:10.1017/atsip.2020.4 fatcat:qhu5h7cj6rhe3mucwjuscubnme

On the Effect of Standing and Seated Viewing of 360∘ Videos on Subjective Quality Assessment: A Pilot Study

Yan Hu, Majed Elwardy, Hans-Jürgen Zepernick
2021 Computers  
The statistical analysis of the data gathered in the pilot study is reported in terms of average rating times, mean opinion scores, standard deviation of opinion scores, head movements, pupil diameter,  ...  Quality assessment of digital media systems and services related to immersive visual stimuli has been one of the challenging problems of multimedia signal processing.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/computers10060080 fatcat:nbku7opplzc3jhqguxnq7vpgse

Subjective evaluation of visual quality and simulator sickness of short 360 videos: ITU-T Rec. P.919

Jesus Gutierrez, Pablo Perez, Marta Orduna, Ashutosh Singla, Carlos Cortes, Pramit Mazumdar, Irene Viola, Kjell Brunnstrom, Federica Battisti, Natalia Cieplinska, Dawid Juszka, Lucjan Janowski (+13 others)
2021 IEEE transactions on multimedia  
Experts Group (VQEG).  ...  However, methods for quality assessment have not been keeping up.  ...  [35] , and compared it with the DSIS and ACR methodologies, finding that DSIS is statistically more reliable [36] .  ... 
doi:10.1109/tmm.2021.3093717 fatcat:g6ipiyhqvnasdlvtkwg2h4xsm4

Development and validation of the Stephenson Multigroup Acculturation Scale (SMAS)

Margaret Stephenson
2000 Psychological Assessment  
Exploratory factor analyses generated a 2-factor solution: ethnic society immersion and dominant society immersion. Item refinement resulted in a 32-item version of the SMAS.  ...  This article describes the development and psychometric evaluation of the Stephenson Multigroup Acculturation Scale (SMAS).  ...  Study 1 describes the development and refinement of the initial item pool of the SMAS using a multiple-method process.  ... 
doi:10.1037/1040-3590.12.1.77 pmid:10752366 fatcat:ck6gx5oq7bbilozipbvcapoe3q

Ibobbly mobile health intervention for suicide prevention in Australian Indigenous youth: a pilot randomised controlled trial

Joseph Tighe, Fiona Shand, Rebecca Ridani, Andrew Mackinnon, Nicole De La Mata, Helen Christensen
2017 BMJ Open  
Objectives: Rates of youth suicide in Australian Indigenous communities are 4 times the national youth average and demand innovative interventions.  ...  The pilot study aimed to evaluate the effectiveness of a self-help mobile app (ibobbly) targeting suicidal ideation, depression, psychological distress and impulsivity among Indigenous youth in remote  ...  This study was designed and was carried out with the help of an Indigenous reference group and expert panel members.  ... 
doi:10.1136/bmjopen-2016-013518 pmid:28132007 pmcid:PMC5278278 fatcat:wlurmdao6ze3naxrrkrwtodhvy

Superficial white matter: A review on the dMRI analysis methods and applications

Miguel Guevara, Pamela Guevara, Claudio Román, Jean-François Mangin
2020 NeuroImage  
Therefore, the mapping of SWM bundles and the use of the resulting atlases for clinical studies requiere dedicated methodologies that are reviewed in this paper.  ...  The mapping of human brain connections is still an on going task.  ...  Also, as atlas2 method used non-linear registration, some extra bundles were detected connecting adjacent gyri.  ... 
doi:10.1016/j.neuroimage.2020.116673 pmid:32114152 fatcat:onw3cxzkvzau7lng54dtgzlwga

A quality assessment protocol for free-viewpoint video sequences synthesized from decompressed depth data

Emilie Bosc, Philippe Hanhart, Patrick Le Callet, Touradj Ebrahimi
2013 2013 Fifth International Workshop on Quality of Multimedia Experience (QoMEX)  
In the absence of a dedicated subjective assessment protocol for the evaluation of such 3D systems, a subjective quality assessment methodology is proposed for the context of MVD compression.  ...  In this paper, the analysis of a subjective quality experiment consisting in assessing the quality of free-viewpoint video sequences generated from decompressed depth data is presented.  ...  RESULTS In this section, the results of statistical analyses of the obtained subjective scores are provided.  ... 
doi:10.1109/qomex.2013.6603218 dblp:conf/qomex/BoscHCE13 fatcat:vwqnbgkip5e2fdi6r5pj27gruu

Framework for the integrated video quality assessment

Mu Mu, Piotr Romaniak, Andreas Mauthe, Mikołaj Leszczuk, Lucjan Janowski, Eduardo Cerqueira
2011 Multimedia tools and applications  
In this paper we address challenges of this task and design an integrated framework using a number of comprehensive functional modules.  ...  Results from experiments verify the concept of an integrated framework and show the effectiveness of its key modules in estimating the quality level of video services.  ...  Blockiness, blur, and noise were the three picture distortions analysed. We used those distortions since our task was to analyse the compression as well as the non professional camera distortions.  ... 
doi:10.1007/s11042-011-0946-3 fatcat:bajbupiadnbsxjaf7h7byogh2i

An extensive performance evaluation of full-reference HDR image quality metrics

Emin Zerman, Giuseppe Valenzise, Frederic Dufaux
2017 Quality and User Experience  
Next, we analyze in depth many FR metrics, including those used in MPEG standardization, using both classical correlation analyses and classification accuracy.  ...  Quality metrics have to be redesigned or adapted to HDR, and understanding their reliability to predict users' judgments is even more critical due to the still limited availability of HDR displays to perform  ...  Acknowledgements The work presented in this paper is supported by BPI France and Région Ile-de-France, in the framework of the FUI18 PLEIN PHARE Project.  ... 
doi:10.1007/s41233-017-0007-4 fatcat:mzatrswcoravxmbuwrdtj7xmia

The Better Assessment of Illness Study for Delirium Severity: Study Design, Procedures, and Cohort Description

Tammy T. Hshieh, Tamara G. Fong, Eva M. Schmitt, Edward R. Marcantonio, Madeline L. D'Aquila, Jacqueline Gallagher, Guoquan Xu, Yun R. Guo, Tatiana F. Abrantes, Sylvie E. Bertrand, Richard N. Jones, Sharon K. Inouye
2018 Gerontology  
To describe the design, procedures, and cohort for the Better ASsessment of ILlness -(BASIL) study, which is conducted to develop and test new delirium severity measures, compare them with existing measures  ...  This paper is dedicated to the memory of Joshua Bryan Inouye Helfand. Funding Source This manuscript was funded by grants no.  ...  BASIL Study Group (Presented in alphabetical order; individuals may be part of multiple groups, but are listed only once under major activity). Overall Principal Investigators (Multi PIs) Sharon K.  ... 
doi:10.1159/000490386 pmid:30032141 pmcid:PMC6335161 fatcat:z3i2a5k7azdnnc2w4e7qusszli

Constitutive activation of the ETS-1-miR-222 circuitry in metastatic melanoma

Gianfranco Mattia, M. Cristina Errico, Federica Felicetti, Marina Petrini, Lisabianca Bottero, Luisa Tomasello, Paolo Romania, Alessandra Boe, Patrizia Segnalini, Antonio Di Virgilio, Mario P. Colombo, Alessandra Carè
2011 Pigment Cell & Melanoma Research  
Parenza for her expert technical support in the in vivo experiments and G. Loreto for figure preparation.  ...  Marziali for critical reading of the manuscript and D. Watson and Y. Sato for the kind supply of ETS-1 transdominant cDNA. We also thank M.  ...  All data were presented as mean values ± standard deviation (SD) or standard errors (SE). Statistical analysis was performed using the t-test with P > 0.05 deemed statistically significant.  ... 
doi:10.1111/j.1755-148x.2011.00881.x pmid:21711453 pmcid:PMC3272348 fatcat:rsaza2kporbytmep6lvhjhpjsy

Naturwissenschaftliche Erkenntnisgewinnung An Chemischen Inhalten Vermitteln - Konzeption Und Empirische Untersuchung Einer Ausstellung Mit Experimentierstation

Christian G. Strippel
2017 Zenodo  
Kommunikationsstrukturen erkennbar - lineare Verläufe der Erkenntnisgewinnung treten häufig zusammen mit Untersuchungen zu Fakten auf, Verläufe mit mehrfachen Wechseln zwischen Untersuchungsplanung und Analyse  ...  Several forms of data are gathered and these are analyzed using a combination of text analysis and statistical analyses.  ...  The methods of data analysis used on the audio-recordings also provides opportunities for future research projects.  ... 
doi:10.5281/zenodo.1095081 fatcat:xufppqpd7zfz3ggpuxno7teo7y

Suitability Analysis of Holographic vs Light Field and 2D Displays for Subjective Quality Assessment of Fourier Holograms [article]

Ayyoub Ahar, Maksymilian Chlipala, Tobias Birnbaum, Weronika Zaperty, Athanasia Symeonidou, Tomasz Kozacki, Malgorzata Kujawinska, Peter Schelkens
2019 arXiv   pre-print
We used Fourier holographic principle to acquire a diverse set of holograms, which were either computer-generated from point clouds or optically recorded from real macroscopic objects.  ...  A final public data set comprising 96 holograms was created using three compression methods which encoded the holograms at four bit-depths.  ...  The models "Perforated Ball" and "Biplane" are courtesy of Manuel Piñeiro from GrabCad.com and ScanLAB Projects, respectively.  ... 
arXiv:1909.12594v1 fatcat:7hvwfs3ggbhvtps4bfzmohvvry
« Previous Showing results 1 — 15 out of 166 results