Consumer Opinions About Frequency of Artifacts in Digital Video

Cermak, Gregory W.

doi:10.1109/jstsp.2009.2014495

Cited by 22 publications

(31 citation statements)

References 7 publications

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“…Apart from standardized methodologies, which recommend, in addition to the evaluation procedures, the environmental conditions to run the tests correctly, some other approaches have been proposed with the aim of getting representative results of what viewers perceive in their households. For example, a different study is presented in [10], were opinions about the effects of typical degradations in digital video services were directly collected from the consumers by means of surveys. In addition, this study investigated the acceptance of the consumers regarding those impairments, taking into account economic aspects.…”

Section: Related Workmentioning

confidence: 99%

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Validation of a novel approach to subjective quality evaluation of conventional and 3D broadcasted video services

Gutiérrez

Pérez²,

Jaureguizar

et al. 2012

2012 Fourth International Workshop on Quality of Multimedia Experience

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Transmission errors are the main cause of degradation of the quality of real broadcasted video services. Therefore, knowing their impact on the quality of experience of the end users is a crucial issue. For instance, it would help to improve the performance of the distribution systems, and to develop monitoring tools to automatically estimate the quality perceived by the viewers. In this paper we validate a subjective evaluation approach specifically designed to obtain meaningful results of the effects of degradations caused by transmission errors. This methodology has been already used in our previous works with monoscopic and stereoscopic videos. The validation is done by comparing the subjective ratings obtained for typical transmission impairments with the proposed methodology and with the standard method Absolute Category Rating. The results show that the proposed approach could provide more representative evaluations of the quality of experience perceived by end users of conventional and 3D broadcasted video services.

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Section: Related Workmentioning

confidence: 99%

“…Taking into account the most common degradations reported by the end users [10], and following with our previous studies [3][5], the impairments that have been simulated are described in Table I.…”

Section: Analyzed Impairmentsmentioning

confidence: 99%

Validation of a novel approach to subjective quality evaluation of conventional and 3D broadcasted video services

Gutiérrez

Pérez²,

Jaureguizar

et al. 2012

2012 Fourth International Workshop on Quality of Multimedia Experience

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“…To cover the first two requirements, the system should be able to detect and measure typical impairments caused by transmission errors in packet-based networks. For example, macroblocking, screen freezes, choppy transitions (short freezes), audio errors, edge noise, or service outage [8]. The proposed approach is based on the detection of these kinds of events, their mapping to quality levels, and the validation of this mapping by using subjective assessments.…”

Section: Problem Statementmentioning

confidence: 99%

“…The main events to detect are the kind of impairments which are valuable for the end users [8]. Table I shows these impairments, together with their main root causes and the QuID used to detect them.…”

Section: A Qualitative Impairment Detectorsmentioning

confidence: 99%

“…Quantization noise can be monitored in the bitstream, up to some point, by reading the QP value. These kinds of artifacts are the less reported by users [8], and some interesting studies of the relation between QP and perceived quality have been already published [12], so these impairments were not considered in our subjective test. Besides, video coding quality can be monitored on the encoder side using more accurate techniques (e.g.…”

Section: A Qualitative Impairment Detectorsmentioning

confidence: 99%

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Qualitative Monitoring of Video Quality of Experience

Pérez¹,

Gutiérrez

Ruiz³

et al. 2011

2011 IEEE International Symposium on Multimedia

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Abstract-Real-time monitoring of multimedia Quality of Experience is a critical task for the providers of multimedia delivery services: from television broadcasters to IP content delivery networks or IPTV. For such scenarios, meaningful metrics are required which can generate useful information to the service providers that overcome the limitations of pure Quality of Service monitoring probes. However, most of objective multimedia quality estimators, aimed at modeling the Mean Opinion Score, are difficult to apply to massive quality monitoring. Thus we propose a lightweight and scalable monitoring architecture called Qualitative Experience Monitoring (QuEM), based on detecting identifiable impairment events such as the ones reported by the customers of those services. We also carried out a subjective assessment test to validate the approach and calibrate the metrics. Preliminary results of this test set support our approach.

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