IEC TR 62251-2003 Multimedia systems and equipment - Quality assessment - Audio-video communication systems《多媒体系统和设备.质量评定.视听通信系统》.pdf
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1、TECHNICAL REPORT IECTR 62251 First edition 2003-05 Multimedia systems and equipment Quality assessment Audio-video communication systems Reference number IEC/TR 62251:2003(E)Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series. For examp
2、le, IEC 34-1 is now referred to as IEC 60034-1. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the base publication incorporating amendment 1 and the base publicati
3、on incorporating amendments 1 and 2. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information relating to this publication, including its validity, is available
4、in the IEC Catalogue of publications (see below) in addition to new editions, amendments and corrigenda. Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication, as well as the list of publications issued, is also
5、 available from the following: IEC Web Site (www.iec.ch) Catalogue of IEC publications The on-line catalogue on the IEC web site (http:/www.iec.ch/searchpub/cur_fut.htm) enables you to search by a variety of criteria including text searches, technical committees and date of publication. On-line info
6、rmation is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. IEC Just Published This summary of recently issued publications (http:/www.iec.ch/online_news/ justpub/jp_entry.htm) is also available by email. Please contact the Customer Service
7、Centre (see below) for further information. Customer Service Centre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00TECHNICAL REPORT IEC TR 62251 First editio
8、n 2003-05 Multimedia systems and equipment Quality assessment Audio-video communication systems PRICE CODE IEC 2003 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, w
9、ithout permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch W For price, see current catalogue Commission Electrotec
10、hnique Internationale International Electrotechnical Commission 2 TR 62251 IEC:2003(E) CONTENTS FOREWORD 4 1 Scope 5 2 References 5 3 Terms and definitions 6 4 Configuration for quality assessment . 6 4.1 Input and output channels. 6 4.2 Points of input and output terminals 7 5 Video quality 8 5.1 I
11、ntroduction 8 5.2 End-to-end tone reproduction . 9 5.3 End-to-end colour reproduction11 5.4 End-to-end colour differences12 5.5 End-to-end peak-signal to noise ratio (PSNR)16 5.6 End-to-end objective assessment of video quality20 6 Audio quality.21 6.1 Perceived audio quality with full-reference sig
12、nals.21 6.2 Sampling rate and quantization resolution .23 6.3 Delay.24 7 Total quality24 7.1 Synchronization of audio and video (lip sync) 24 7.2 Scalability25 7.3 Overall quality .26 Annex A (informative) PSNRs defined in three-dimensional spaces applied to hypothetical deterioration over the refer
13、ence video sources 27 Annex B (informative) End-to-end objective assessment of video quality in spatial frequency domain31 Annex C (informative) PEAQ objective measurement method outline .36 Bibliography40 Figure 1 Model of audio-video communication systems . 7 Figure 2 Schematic diagram for quality
14、 assessment 7 Figure 3 The image of the grey steps defined in IEC 61146-1 9 Figure 4 An example plot of tone reproduction 10 Figure 5 The image of the colour reproduction chart defined in IEC 61146-111 Figure 6 Colour differences between reference and streamed video frames at 250 kbps and 30 fps.15
15、Figure 7 Examples of PSNR assessment19 Figure 8 Basic concept for making objective measurements.22 Figure 9 Representation of PEAQ model 22 Figure B.1 Assignment of the block numbers31 Figure B.2 Example of wavelet decomposition visualised .31TR 62251 IEC:2003(E) 3 Figure B.3 Trends of difference of
16、 coefficients of wavelet transform between reference and streamed video frames at 250 kbps and 30 fps .34 Figure C.1 Basic concept for making objective measurements .36 Figure C.2 Representation of PEAQ model.37 Figure C.3 FFT based ear model, PEAQ basic version.37 Figure C.4 Filter bank based ear m
17、odel, PEAQ advanced version 38 Table 1 An example of tone reproduction .10 Table 2 An example of colour reproduction.12 Table 3 Grand averages of colour differences 16 Table 4 Overall PNSRs averaged over the frames.20 Table 5 Test items and resulting DI and ODG values for the basic version .23 Table
18、 6 Test items and resulting DI and ODG values for the advanced version 23 Table A.1 Reference video sources available for objective assessment27 Table A.2 PSNRs in various colour spaces and the colour difference for SRC13 and SRC14 .28 Table A.3 PSNRs in various colour spaces and the colour differen
19、ce for SRC15 and SRC16 .28 Table A.4 PSNRs in various colour spaces and the colour difference for SRC17 and SRC18 .29 Table A.5 PSNRs in various colour spaces and the colour difference for SRC19 and SRC20 .29 Table A.6 PSNRs in various colour spaces and the colour difference for SRC21 and SRC22 .30
20、Table B.1 Summary of difference of coefficients of wavelet coefficients35 Table C.1 Model output variables, PEAQ basic version 38 Table C.2 Model output variables, PEAQ advanced version .39 4 TR 62251 IEC:2003(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MULTIMEDIA SYSTEMS AND EQUIPMENT QUALITY AS
21、SESSMENT AUDIO-VIDEO COMMUNICATION SYSTEMS FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on
22、all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may pa
23、rticipate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreem
24、ent between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The do
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