Perceptual quality of 4K-resolution video content compared to HD

Background: In this paper, we propose a secure image watermarking technique which is applied to grayscale and color images. It consists in applying the SVD (Singular Value Decomposition) in the Lifting Wavelet Transform domain for embedding a speech image (the watermark) into the host image. Methods: It also uses signature in the embedding and extraction steps. Its performance is justified by the computation of PSNR (Pick Signal to Noise Ratio), SSIM (Structural Similarity), SNR (Signal to Noise Ratio), SegSNR (Segmental SNR) and PESQ (Perceptual Evaluation Speech Quality). Results: The PSNR and SSIM are used for evaluating the perceptual quality of the watermarked image compared to the original image. The SNR, SegSNR and PESQ are used for evaluating the perceptual quality of the reconstructed or extracted speech signal compared to the original speech signal. Conclusion: The Results obtained from computation of PSNR, SSIM, SNR, SegSNR and PESQ show the performance of the proposed technique.

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A quality analysis of the YouTube video content on meniscus repair surgery

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967121s00013 ◽

2021 ◽

Vol 9 (2_suppl) ◽

pp. 2325967121S0001

Author(s):

François Sigonney ◽

Camille Steltzlen ◽

Pierre Alban Bouché ◽

Nicolas Pujol

Keyword(s):

Medical Information ◽

Cruciate Ligament ◽

Meniscus Repair ◽

Quality Analysis ◽

Video Content ◽

Source Type ◽

Keywords Meniscus ◽

Youtube Videos ◽

Anterior Cruciate

Objectives: The Internet, especially YouTube, is an important and growing source of medical information. The content of this information is poorly evaluated. The objective of this study was to analyze the quality of YouTube video content on meniscus repair. The hypothesis was that this source of information is not relevant for patients. Methods: A YouTube search was carried out using the keywords "meniscus repair". Videos had to have had more than 10,000 views to be included. The videos were analyzed by two evaluators. Various features of the videos were recorded (number of views, date of publication, "likes", "don’t likes", number of comments, source, type of content and the origin of the video). The quality of the video content was analyzed by two validated information system scores: the JAMA benchmark score (0 to 4) and the Modified DISCERN score (0 to 5). A specific meniscus repair score (MRSS scored out of 22) was developed for this study, in the same way that a specific score has been developed for other similar studies (anterior cruciate ligament, spine, etc.). Results: Forty-four (44) videos were included in the study. The average number of views per video was 180,100 (± 222,000) for a total number of views of 7,924,095. The majority of the videos were from North America (90.9%). In most cases, the source (uploader) that published the video was a doctor (59.1%). A manufacturer, an institution and a non-medical source were the other sources. The content actually contained information on meniscus repair in only 50% of the cases. The mean scores for the JAMA benchmark, MD score and MRSS were 1.6/4± 0.75, 1.2/5 ± 1.02 and 4.5/22 (± 4.01) respectively. No correlation was found between the number of views and the quality of the videos. The quality of videos from medical sources was not superior to those from other sources. Conclusion: The content of YouTube videos on meniscus repair is of very low quality. Physicians should inform patients and, more importantly, contribute to the improvement of these contents.

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Cents versus scale steps: Can we tell the difference between major and minor thirds?

Psychology of Music ◽

10.1177/0305735620987272 ◽

2021 ◽

pp. 030573562098727

Author(s):

Pedro Neto ◽

Patricia M Vanzella

Keyword(s):

Auditory Processing ◽

Perceptual Quality ◽

Chromatic Scale ◽

Major Scale ◽

Accurate Performance ◽

The Difference ◽

Scale Step ◽

Frequency Ratios ◽

Tonal Context

We report an experiment in which participants ( N = 368) were asked to differentiate between major and minor thirds. These intervals could either be formed by diatonic tones from the C major scale (tonal condition) or by a subset of tones from the chromatic scale (atonal condition). We hypothesized that in the tonal condition intervals would be perceived as a function of scale step distances, which we defined as the number of diatonic leaps between two notes of a given music scale. In the atonal condition, we hypothesized that intervals would be perceived as a function of cents. If our hypotheses were supported, we should verify a less accurate performance in the tonal condition, where scale step distances are the same between major and minor thirds. The data corroborated our hypotheses, and we suggest that acoustic measurements of intervallic distances (i.e., frequency ratios and cents) are not optimal when it comes to describing the perceptual quality of intervals in a tonal context. Finally, our research points to the possibility that, in comparison with previous models, scale steps and cents might better capture the notion of global versus local instances of auditory processing.

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Objective evaluation of the perceptual quality of 3D watermarking

IEEE International Conference on Image Processing 2005 ◽

10.1109/icip.2005.1529732 ◽

2005 ◽

Cited By ~ 24

Author(s):

E.D. Gelasca ◽

T. Ebrahimi ◽

M. Corsini ◽

M. Barni

Keyword(s):

Objective Evaluation ◽

Perceptual Quality ◽

3D Watermarking

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Optimizing the Perceptual Quality of Real-Time Multimedia Applications

IEEE Multimedia ◽

10.1109/mmul.2015.70 ◽

2015 ◽

Vol 22 (4) ◽

pp. 14-28 ◽

Cited By ~ 2

Author(s):

Jingxi Xu ◽

Benjamin W. Wah

Keyword(s):

Real Time ◽

Multimedia Applications ◽

Perceptual Quality

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The Perceptual Quality of the Oculus Rift for Immersive Virtual Reality

Human-Computer Interaction ◽

10.1080/07370024.2016.1243478 ◽

2016 ◽

Vol 34 (1) ◽

pp. 51-82 ◽

Cited By ~ 22

Author(s):

Manuela Chessa ◽

Guido Maiello ◽

Alessia Borsari ◽

Peter J. Bex

Keyword(s):

Virtual Reality ◽

Perceptual Quality ◽

Immersive Virtual Reality ◽

Oculus Rift

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Impact of new digital compression on the perceptual quality of speech transmitted via fixed satellite link

Proceedings of 2nd International Conference on Recent Advances in Space Technologies, 2005. RAST 2005. ◽

10.1109/rast.2005.1512604 ◽

2006 ◽

Cited By ~ 1

Author(s):

S. Pivac ◽

V. Lipovac ◽

N. Behlilovic

Keyword(s):

Perceptual Quality ◽

Satellite Link ◽

Digital Compression

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YouTube as a source of public health information regarding COVID-19 vaccination: an assessment of reliability and quality of video content (Preprint)

10.2196/preprints.29942 ◽

2021 ◽

Author(s):

Calvin Chan ◽

Viknesh Sounderajah ◽

Elisabeth Daniels ◽

Amish Acharya ◽

Jonathan Clarke ◽

...

Keyword(s):

Public Health ◽

Health Information ◽

Public Awareness ◽

Public Health Intervention ◽

Medical Professionals ◽

Video Content ◽

Public Health Information ◽

Health Related ◽

Quality And Reliability

BACKGROUND Recent emergency authorisation and rollout of COVID-19 vaccines by regulatory bodies has generated global attention. As the most popular video-sharing platform globally, YouTube is a potent medium for dissemination of key public health information. Understanding the nature of available content regarding COVID-19 vaccination on this widely used platform is of substantial public health interest. OBJECTIVE To evaluate the reliability and quality of information of YouTube videos regarding COVID-19 vaccination. METHODS For this cross-sectional study, the phrases ‘coronavirus vaccine’ and ‘COVID-19 vaccine’ were searched on the UK version of YouTube on December 10, 2020. The 200 most-viewed videos of each search were extracted and screened for relevance and English language. Video content and characteristics were extracted and independently rated against Health on the Net Foundation Code of Conduct (HONCode) and DISCERN quality criteria for consumer health information by two authors. RESULTS Forty-eight videos, with a combined total view count of 30,100,561, were included in the analysis. Topics addressed comprised: vaccine science (58%), vaccine trials (58%), side effects (48%), efficacy (35%) and manufacturing (17%). Twenty-one percent of videos encouraged continued public health measures. Only 4.2% of videos made non-factual claims. Ninety-eight percent of video content was scored to have low (60%) or medium (38%) adherence to HONCode principles. Educational channels produced by both medical and non-medical professionals achieved significantly higher DISCERN scores than other categories. The highest DISCERN scores were achieved by educational videos produced by medical professionals (64.3 (58.5-66.3)) and the lowest scores by independent users (18 (18-20)). CONCLUSIONS Overall quality and reliability of information on YouTube regarding COVID-19 vaccines remains poor. Videos produced by educational channels, especially by medical professionals, were higher in quality and reliability than those produced by other sources, including health-related organisations. Collaboration between health-related organisations and established medical and educational YouTube content producers provide an opportunity for dissemination of high-quality information regarding COVID-19 vaccination. Such collaboration holds potential as a rapidly implementable public health intervention aiming to engage a wide audience and increase public awareness and knowledge.

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