All subjective scales are not created equal: The effects of context on different scales

Corriveau, Philip; Gojmerac, Christina; Hughes, Bronwen; Stelmach, Lew B.

doi:10.1016/s0165-1684(99)00018-3

Cited by 42 publications

(29 citation statements)

References 6 publications

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“…A broad meaning of these terms gives rise to some ambiguity in the reported results. Such imprecise terminology can even be misleading as there are at least three different meanings for which the term "context" or its derivatives is normally used: 1) Stimulus context-the range or the distribution of stimuli [13]- [19], 2) Scaling context-the scaling method used [20], 3) Environmental or situational context [5] [21].…”

Section: Confusion Around the Term "Context"mentioning

confidence: 99%

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On Some Biases Encountered in Modern Audio Quality Listening Tests (Part 2): Selected Graphical Examples and Discussion

Zieliński¹

2016

J. Audio Eng. Soc.

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Section: Confusion Around the Term "Context"mentioning

confidence: 99%

“…Corriveau et al reached the conclusion that some assessment methods might be more prone to the stimulus spacing bias than others [13]. In their experiment they compared the three methods known as Double Stimulus Continuous Quality Scale (DSCQS), Double Stimulus Impairment Scale-variant II (DSIS II), and Comparison method.…”

Section: Stimulus Spacing Biasmentioning

confidence: 99%

On Some Biases Encountered in Modern Audio Quality Listening Tests (Part 2): Selected Graphical Examples and Discussion

Zieliński¹

2016

J. Audio Eng. Soc.

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“…Presentation of test scenes randomised across subjects according to a pseudo-Latin square design. The function of this randomisation was to reduce any contextual effects that might be introduced by the order of scene presentation [13]. Reference scenes were included in the test but their presence was not made explicit to the subject.…”

Section: Methodsmentioning

confidence: 99%

Subjective Quality Assessment of the H.264/AVC In-Loop De-Blocking Filter

Brotherton¹

2006

IEICE Transactions on Communications

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SUMMARYNext generation codecs, benchmarked by the H.264/AVC standard, are providing substantial compression efficiency for the coding and transmission of video. Coupled with technologies offering larger transmission bandwidths over DSL, wireless and satellite networks, the capability of delivering high quality video services to the home is now a reality. The perceptual quality of the content delivered over communications networks will be crucial in ensuring a first-class customer experience. It is therefore important to assess the advantages and disadvantages of the optional features offered by next generation codecs. This paper describes a subjective assessment that was carried out to investigate the perceptual effects of switching the in loop de-blocking filter within the H.264/ AVC CODEC on or off. Although the filter is believed to substantially improve the perceptual quality of video, it has been suggested that in some cases negative perceptual effects can be produced. The H.264/AVC architecture allows de-blocking to be switched off in cases where there are limited processing resources or it is considered a negative perceptual effect may be introduced. This paper describes a study that examined the perceptual effects of de-blocking by employing a standardised subjective assessment methodology. The Absolute Category Rating (ACR) method was used to capture Difference Mean Opinion Scores (DMOS) for a range of video. Content was selected to span a wide and representative range of coding complexity. This content was then encoded at a variety of bit-rates to represent high, medium and low qualities. Results were used to examine the end-user perception of video quality when the de-blocking filter is switched on or off. The experimental design allowed the overall effects of the de-blocking filter to be examined and additionally the relationship between content and quality on the filter performance. The experiment found that the performance of the de-blocking filter was content-dependent. Results were used to discuss the advantages and disadvantages of in-loop de-blocking and there is an examination of content properties (e.g. spatial and temporal complexity) that influence the performance of de-blocking. key words : subjective assessment, video quality, H.264/AVC,

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“…Thus, if we aimed to map the MOS scale to quality labels such as 'Poor' (lower end of the x scale), 'Fair' (on the middle) and 'Good' (high end of the scale); the results would hardly be reliable. These diagrams give a general feel as to the actual perceived quality but cannot be used to directly map quality labels onto a continuous axis or to draw any conclusive results [90]. Furthermore, the question remains as to whether the distance between the 'Poor' and 'Fair' value on the x-axis is the same as the distance between the 'Fair' and 'Good' perception of the participant.…”

Section: Rating the Qualitymentioning

confidence: 99%

Computational Inference and Control of Quality in Multimedia Services

Menkovski

2015

Springer Theses

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Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nl providing details and we will investigate your claim. Copyright c 2013 by Vlado Menkovski All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means without the prior written consent of the author. Typeset using L A T E X, printed in The NetherlandsTo my parents, Angel who dedicated his life to his sons and Snežana whose strength inspires me deeply. SummaryQuality is the degree of excellence we expect of a service or a product. It is also one of the key factors that determine its value. For multimedia services, understanding the experienced quality means understanding how the delivered fidelity, precision and reliability correspond to the users' expectations. Yet the quality of multimedia services is inextricably linked to the underlying technology. It is developments in video recording, compression and transport as well as display technologies that enables high quality multimedia services to become ubiquitous. The constant evolution of these technologies delivers a steady increase in performance, but also a growing level of complexity. As new technologies stack on top of each other the interactions between them and their components become more intricate and obscure. In this environment optimizing the delivered quality of multimedia services becomes increasingly challenging. The factors that affect the experienced quality, or Quality of Experience (QoE), tend to have complex non-linear relat...

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All subjective scales are not created equal: The effects of context on different scales

Cited by 42 publications

References 6 publications

On Some Biases Encountered in Modern Audio Quality Listening Tests (Part 2): Selected Graphical Examples and Discussion

On Some Biases Encountered in Modern Audio Quality Listening Tests (Part 2): Selected Graphical Examples and Discussion

Subjective Quality Assessment of the H.264/AVC In-Loop De-Blocking Filter

Computational Inference and Control of Quality in Multimedia Services

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