IEC_TR_62251-2003.pdf

TECHNICALREPORTIEC TR 62251First edition2003-05Multimedia systems and equipment Quality assessment Audio-video communication systemsReference numberIEC/TR 62251:2003(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe 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,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe 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,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just Published This summary of recently issued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 CustomerService Centre(see below)for further information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TECHNICALREPORTIECTR 62251First edition2003-05Multimedia systems and equipment Quality assessment Audio-video communication systemsPRICE CODE IEC 2003 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chWFor price,see current catalogueCommission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TR 62251 IEC:2003(E)CONTENTSFOREWORD.41Scope.52References.53Terms and definitions.64Configuration for quality assessment.64.1Input and output channels.64.2Points of input and output terminals.75Video quality.85.1Introduction.85.2End-to-end tone reproduction.95.3End-to-end colour reproduction.115.4End-to-end colour differences.125.5End-to-end peak-signal to noise ratio(PSNR).165.6End-to-end objective assessment of video quality.206Audio quality.216.1Perceived audio quality with full-reference signals.216.2Sampling rate and quantization resolution.236.3Delay.247Total quality.247.1Synchronization of audio and video(lip sync).247.2Scalability.257.3Overall quality.26Annex A(informative)PSNRs defined in three-dimensional spaces applied tohypothetical deterioration over the reference video sources.27Annex B(informative)End-to-end objective assessment of video quality in spatialfrequency domain.31Annex C(informative)PEAQ objective measurement method outline.36Bibliography.40Figure 1 Model of audio-video communication systems.7Figure 2 Schematic diagram for quality assessment.7Figure 3 The image of the grey steps defined in IEC 61146-1.9Figure 4 An example plot of tone reproduction.10Figure 5 The image of the colour reproduction chart defined in IEC 61146-1.11Figure 6 Colour differences between reference and streamed video frames at 250 kbpsand 30 fps.15Figure 7 Examples of PSNR assessment.19Figure 8 Basic concept for making objective measurements.22Figure 9 Representation of PEAQ model.22Figure B.1 Assignment of the block numbers.31Figure B.2 Example of wavelet decomposition visualised.31LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TR 62251 IEC:2003(E)3 Figure B.3 Trends of difference of coefficients of wavelet transform betweenreference and streamed video frames at 250 kbps and 30 fps.34Figure C.1 Basic concept for making objective measurements.36Figure C.2 Representation of PEAQ model.37Figure C.