音视频媒体流质量的非参数入侵评估 |
ITU-T P.1201建议书概要介绍基于IP的视频业务(以分组字头信息为基础)的音频、视频和音视频质量非入侵式监测算法模型。ITU-T P.1201系列建议书涉及两个应用领域: – ITU-T P.1201.1具体规定较低分辨率(LR)应用领域的模型算法,包括移动电视等业务。– ITU-T P.1201.2具体规定较高分辨率(HR)应用领域的模型算法,包括IP电视等业务。以上两个ITU-T P.1201模型算法是无参考(即,非入侵式)模型,其工作原理是分析相关数据包追踪数据(以数据包捕获格式(PCAP)提供给模型算法)中的数据包字头信息。更多的有关媒体流的一般情况输入信息(如视频分辨率)可能无法由数据包字头信息提供,但却提供给带外模型算法(如以具体针对视频流的非主要信息形式提供)。作为输出,模型算法按照五点绝对类别评定值(ACR)的平均意见评分(MOS)等级,提供单个音频、视频和音视频质量的估算结果。此外,还可提供造成质量劣化的诊断信息。为了对ITU-T P.1201所述模型做出补充,ITU T P.1202系列建议书提出了进一步的模型。这些所谓的ITU-T P.1202模型是以比特流为基础的视频质量模型。它与ITU-T P.1201的主要不同表现在下列方面: – ITU-T P.1201模型提供音频、视频和音视频质量评估模型,而ITU T P.1202模型仅提供视频质量估算。– ITU-T P.1201模型使用数据包字头信息,而ITU-T P.1202模型则充分利用进一步的比特流信息,如与编码相关的信息。有鉴于此,ITU T P.1202模型在质量预测方面更为准确。反过来而言,这些模型要求使用非加密视频流,以方便获取有效载荷信息。由于ITU T P.1202模型更为复杂,因此需要以更强的计算能力来估算视频质量。 |
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Citation: |
https://handle.itu.int/11.1002/1000/11727 |
Series title: |
P series: Telephone transmission quality, telephone installations, local line networks P.1200-P.1299: Models and tools for quality assessment of streamed media |
Approval date: |
2012-10-14 |
Provisional name: | P.NAMS |
Approval process: | AAP |
Status: |
In force |
Observation: | The published text of this Recommendation includes the modifications introduced by P.1201 (2012) Amd.1 (2013). |
Maintenance responsibility: |
ITU-T Study Group 12 |
Further details: |
Patent statement(s)
Development history
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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P Suppl. 10 (11/1988)
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Considerations relating to transmission characteristics for analogue handset telephones
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In force
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-
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here
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here
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P Suppl. 16 (11/1988)
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Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)
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In force
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-
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here
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here
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P Suppl. 20 (03/1993)
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Examples of measurements of handset receive-frequency responses: dependence on earcap leakage losses
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In force
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-
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here
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here
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P Suppl. 23 (02/1998)
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ITU-T coded-speech database
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In force
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here
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here
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here
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P Suppl. 24 (10/2005)
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Parameters describing the interaction with spoken dialogue systems
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In force
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here
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here
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here
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P Suppl. 25 (01/2011)
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Parameters describing the interaction with multimodal dialogue systems
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In force
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here
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here
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here
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P Suppl. 26 (09/2017)
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Scenarios for the subjective evaluation of audio and audiovisual multiparty telemeeting quality
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In force
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here
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here
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here
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P Suppl. 28 (09/2020)
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Considerations for the development of new QoS and QoE related objective models to be embedded in Recommendations prepared by ITU-T Study Group 12
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In force
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here
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here
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here
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