ITU-T J 341-2011 Objective perceptual multimedia video quality measurement of HDTV for digital cable television in the presence of a full reference (Study Group 9)《全参考型数字有线高清电视的客观认.pdf
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1、 International Telecommunication Union ITU-T J.341TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2011) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Measurement of the quality of service Objective perceptual multimedia video quality measur
2、ement of HDTV for digital cable television in the presence of a full reference Recommendation ITU-T J.341 Rec. ITU-T J.341 (01/2011) i Recommendation ITU-T J.341 Objective perceptual multimedia video quality measurement of HDTV for digital cable television in the presence of a full reference Summary
3、 Recommendation ITU-T J.341 provides an objective perceptual video quality measurement method for HDTV when a full reference signal is available. The following list shows example applications that can use this Recommendation: 1) Potentially real-time, in-service quality monitoring at the source. 2)
4、Remote destination quality monitoring when a copy of the source is available at the point of measurement. 3) Quality measurement for monitoring of a storage or transmission system that utilizes video compression and decompression techniques, either a single pass or a concatenation of such techniques
5、. 4) Lab testing of video systems. This Recommendation includes an electronic attachment containing several short high definition (HD) video sequences, their corresponding predicted mean opinion scores (MOS), and the predicted MOS for five HD databases available via VQEG. History Edition Recommendat
6、ion Approval Study Group 1.0 ITU-T J.341 2011-01-13 9 ii Rec. ITU-T J.341 (01/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Stand
7、ardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), wh
8、ich meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within
9、ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendat
10、ion is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “
11、must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation
12、 may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of
13、this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent datab
14、ase at http:/www.itu.int/ITU-T/ipr/. ITU 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T J.341 (01/2011) iii Table of Contents Page 1 Scope 1 1.1 Application . 2 1.2 Limitations 2 2 References.
15、2 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 Conventions 3 6 Description of the full reference methodology . 4 7 Findings of the Video Quality Experts Group (VQEG) . 5 Annex A Model description 6 A.1 Preprocessing 7 A.2
16、 Time alignment . 8 A.3 Spatial frame alignment 9 A.4 Computation of local similarity and local difference features . 10 A.5 Analysis of the distribution of local features 10 A.6 Computation of the blockiness feature . 12 A.7 Computation of the jerkiness feature (temporal quality) 13 A.8 Aggregation
17、 to MOS 15 A.9 Handling of heavily spatially misaligned video sequences 20 A.10 Reference source code implementation 21 Annex B Conformance testing 22 Bibliography. 23 Electronic attachment: HD video sequences and predicted MOSs. Rec. ITU-T J.341 (01/2011) 1 Recommendation ITU-T J.341 Objective perc
18、eptual multimedia video quality measurement of HDTV for digital cable television in the presence of a full reference 1 Scope This Recommendation1provides a perceptual video quality measurement method for use in high definition television (HDTV) non-interactive applications when the full reference (F
19、R) measurement method can be used. The model was developed to estimate subjective quality scores obtained using b-ITU-T P.910. The full reference measurement method can be used when the unimpaired reference video signal is readily available at the measurement point, as may be the case of measurement
20、s on individual equipment or a chain in the laboratory or in a closed environment such as a cable television head end. The estimation method includes both calibration and objective video quality estimations. The validation test material contained both b-ITU-T H.264 and MPEG-2 coding degradations and
21、 various transmission error conditions (e.g., bit errors, dropped packets). The model proposed in this Recommendation may be used to monitor the quality of deployed networks to ensure their operational readiness. The visual effects of the degradations may include spatial as well as temporal degradat
22、ions. The model in this Recommendation can also be used for lab testing of video systems. When used to compare different video systems, it is advisable to use a quantitative method (such as that in b-ITU-T J.149) to determine the models accuracy for that particular context. This Recommendation is de
23、emed appropriate for telecommunication services delivered at between 1 Mbit/s and 30 Mbit/s. The following resolutions and frame rates were considered in the validation test: 1080i 60 Hz (29.97 fps) 1080p (25 fps) 1080i 50 Hz (25 fps) 1080p (29.97 fps) The following conditions were allowed in the va
24、lidation test for each resolution: Test factors Video resolution: 1920x1080 interlaced and progressive Video frame rates 29.97 and 25 frames per second Video bitrates: 1 to 30 Mbit/s Temporal frame freezing (pausing with skipping) of maximum 2 seconds Transmission errors with packet loss Conversion
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