1、 International Telecommunication Union ITU-T H.262TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(01/2007) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Coding of moving video Information technology Generic coding of moving pictures and associated aud
2、io information: Video Amendment 2: Support for colour spaces ITU-T Recommendation H.262 (2000) Amendment 2 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission m
3、ultiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multim
4、edia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-S
5、eries multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.55
6、0H.559Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND AND TRIPLE-PLAY MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) i INTERNATIONAL S
7、TANDARD ISO/IEC 13818-2 ITU-T RECOMMENDATION H.262 Information technology Generic coding of moving pictures and associated audio information: Video Amendment 2 Support for colour spaces Summary This amendment enables indication of the use of the transfer characteristics of the extended-gamut colour
8、systems of ITU-R Rec. BT.1361 and IEC 61966-2-4 in video bitstreams encoded using ITU-T Rec. H.262 | ISO/IEC 13818-2 (informally known as MPEG-2 Video). It also improves harmonization of colour space support with similar indicators specified in amendments to ITU-T Rec. H.264 | ISO/IEC 14496-10 and I
9、SO/IEC 14496-2 video coding standards, including the addition of support for a “YCgCo“ matrix coefficients indicator as previously specified in ITU-T Rec. H.264 | ISO/IEC 14496-10. Furthermore, it improves and updates the editorial format of the parts of the standard that relate to video colour spac
10、e indicators. Source Amendment 2 to ITU-T Recommendation H.262 (2000) was approved on 13 January 2007 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. An identical text is also published as ISO/IEC 13818-2, Amendment 2. ii ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) FORE
11、WORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issu
12、ing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these top
13、ics. 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 ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression
14、 “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) a
15、nd compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommen
16、dation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of cl
17、aimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommen
18、dation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, wi
19、thout the prior written permission of ITU. ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) iii CONTENTS Page 1) Subclause 4.1. 1 2) Table 6-7 1 3) Table 6-8 2 4) Subclause 6.3.6 semantics of matrix_coefficients and Table 6-9 3 ISO/IEC 13818-2:2000/Amd.2:2007 (E) ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) 1 INT
20、ERNATIONAL STANDARD ITU-T RECOMMENDATION Information technology Generic coding of moving pictures and associated audio information: Video Amendment 2 Support for colour spaces 1) Subclause 4.1 Add the following definitions at the end of subclause 4.1: Floor() the largest integer less than or equal t
21、o the argument. Round() Sign( x ) * Floor( Abs( x ) + 0.5 ), for an argument x 2) Table 6-7 Replace Table 6-7 with: Table 6-7 Colour primaries Value Primaries Informative remarks 0 Forbidden 1 primary x y green 0.300 0.600 blue 0.150 0.060 red 0.640 0.330 white D65 0.3127 0.3290 ITU-R Rec. BT.709-5
22、ITU-R Rec. BT.1361 conventional colour gamut system or extended colour gamut system IEC 61966-2-4 Society of Motion Picture and Television Engineers RP 177 Annex B 2 Unspecified Image characteristics are unknown or are determined by the application 3 Reserved For future use by ITU-T | ISO/IEC 4 prim
23、ary x y green 0.21 0.71 blue 0.14 0.08 red 0.67 0.33 white C 0.310 0.316 ITU-R Rec. BT.470-6 System M (historical) United States National Television System Committee 1953 Recommendation for transmission standards for colour television United States Federal Communications Commission Title 47 Code of
24、Federal Regulations (2004) 73.682 (a) (20) 5 primary x y green 0.29 0.60 blue 0.15 0.06 red 0.64 0.33 white D65 0.3127 0.3290 ITU-R Rec. BT.1700 625 PAL or 625 SECAM ITU-R Rec. BT.1358 625 ITU-R Rec. BT.470-6 System B, G (historical) ITU-R Rec. BT.601-6 625 6 primary x y green 0.310 0.595 blue 0.155
25、 0.070 red 0.630 0.340 white D65 0.3127 0.3290 ITU-R Rec. BT.1700 NTSC ITU-R Rec. BT.1358 525 Society of Motion Picture and Television Engineers 170M (functionally the same as the value 7) ITU-R Rec. BT.601-6 525 ISO/IEC 13818-2:2000/Amd.2:2007 (E) 2 ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) Table 6-7
26、 Colour primaries Value Primaries Informative remarks 7 primary x y green 0.310 0.595 blue 0.155 0.070 red 0.630 0.340 white D65 0.3127 0.3290 Society of Motion Picture and Television Engineers 240M (functionally the same as the value 6) 8-255 Reserved For future use by ITU-T | ISO/IEC 3) Table 6-8
27、Replace Table 6-8 with: Table 6-8 Transfer characteristics Value Transfer characteristic Informative remarks 0 Forbidden 1 V = 1.099 Lc0.45 0.099 for 1 Lc 0.018 V = 4.500 Lcfor 0.018 Lc 0 ITU-R Rec. BT.709-5 ITU-R Rec. BT.1361 conventional colour gamut system (functionally the same as the value 6) 2
28、 Unspecified Image characteristics are unknown or are determined by the application. 3 Reserved For future use by ITU-T | ISO/IEC 4 Assumed display gamma 2.2 ITU-R Rec. BT.470-6 System M (historical) United States National Television System Committee 1953 Recommendation for transmission standards fo
29、r colour television United States Federal Communications Commission Title 47 Code of Federal Regulations (2004) 73.682 (a) (20) 5 Assumed display gamma 2.8 ITU-R Rec. BT.1700 (2007 Revision) 625 PAL or 625 SECAM ITU-R Rec. BT.470-6 System B, G (historical) 6 V = 1.099 Lc0.45 0.099 for 1 Lc 0.018 V =
30、 4.500 Lcfor 0.018 Lc 0 ITU-R Rec. BT.1700 NTSC ITU-R Rec. BT.1358 525 or 625 Society of Motion Picture and Television Engineers 170M (functionally the same as the value 1) ITU-R Rec. BT.601-6 525 or 625 7 V = 1.1115 Lc0.45 0.1115 for Lc 0.0228 V = 4.0 Lcfor 0.0228 LcSociety of Motion Picture and Te
31、levision Engineers 240M 8 V = LcLinear transfer characteristics 9 V = 1.0 Log10(Lc) 2 for 1 Lc 0.01 V = 0.0 for 0.01 Lc 0 Logarithmic transfer characteristic (100:1 range) 10 V = 1.0 Log10(Lc) 2.5 for 1 Lc 0.0031622777 V = 0.0 for 0.0031622777 Lc 0 Logarithmic transfer characteristic (316.22777:1 ra
32、nge) ISO/IEC 13818-2:2000/Amd.2:2007 (E) ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) 3 Table 6-8 Transfer characteristics Value Transfer characteristic Informative remarks 11 V = 1.099 Lc0.45 0.099 for Lc 0.018 V = 4.500 Lcfor 0.018 Lc 0.018 V = (1.099 (Lc)0.45 0.099) for 0.018 LcIEC 61966-2-4 12 V = 1.
33、099 Lc0.45 0.099 for 1.33 Lc 0.018 V = 4.500 Lcfor 0.018 Lc 0.0045 V = (1.099 (4 * Lc)0.450.099) 4 for 0.0045 Lc 0.25 ITU-R Rec. BT.1361 extended colour gamut system 13-255 Reserved For future use by ITU-T | ISO/IEC 4) Subclause 6.3.6 semantics of matrix_coefficients and Table 6-9 Replace semantics
34、of matrix_coefficients and Table 6-9 with: matrix_coefficients This 8-bit integer describes the matrix coefficients used in deriving luminance and chrominance signals from the green, blue, and red primaries, and is defined in Table 6-9. Table 6-9 Matrix coefficients Value Matrix Informative remarks
35、0 Forbidden 1 EY= 0.7152 EG+ 0.0722 EB+ 0.2126 EREPB= 0.3854 EG+ 0.5000 EB 0.1146 ER EPR= 0.4542 EG 0.0458 EB+ 0.5000 ERITU-R Rec. BT.709-5 ITU-R Rec. BT.1361 conventional colour gamut system and extended colour gamut system IEC 61966-2-4 xvYCC709 Society of Motion Picture and Television Engineers R
36、P 177 Annex B 2 Unspecified Image characteristics are unknown or are determined by the application 3 Reserved For future use by ITU-T | ISO/IEC 4 EY= 0.59 EG+ 0.11 EB+ 0.30 EREPB= 0.331 EG+ 0.500 EB 0.169 EREPR= 0.421 EG 0.079 EB+ 0.500 ERUnited States National Television System Committee 1953 Recom
37、mendation for transmission standards for colour television United States Federal Communications Commission Title 47 Code of Federal Regulations (2004) 73.682 (a) (20) 5 EY= 0.5870 EG+ 0.1140 EB+ 0.2990 EREPB= 0.3313 EG+ 0.5000 EB 0.1687 EREPR= 0.4187 EG 0.0813 EB+ 0.5000 ERITU-R Rec. BT.1700 625 PAL
38、 or 625 SECAM ITU-R Rec. BT.1358 625 IEC 61966-2-4 xvYCC601ITU-R Rec. BT.470-6 System B, G (historical) (functionally the same as the value 6) ITU-R Rec. BT.601-6 625 6 EY= 0.5870 EG+ 0.1140 EB+ 0.2990 EREPB= 0.3313 EG+ 0.5000 EB 0.1687 EREPR= 0.4187 EG 0.0813 EB+ 0.5000 ERITU-R Rec. BT.1700 NTSC IT
39、U-R Rec. BT.1358 525 Society of Motion Picture and Television Engineers 170M IEC 61966-2-4 xvYCC601 (functionally the same as the value 5) ITU-R Rec. BT.601-6 525 ISO/IEC 13818-2:2000/Amd.2:2007 (E) 4 ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) Table 6-9 Matrix coefficients Value Matrix Informative rema
40、rks 7 EY= 0.701 EG+ 0.087 EB+ 0.212 EREPB= 0.384 EG+ 0.500 EB 0.116 EREPR= 0.445 EG 0.055 EB+ 0.500 ERSociety of Motion Picture and Television Engineers 240M 8 YCgCo Defined as specified below 9-255 Reserved For future use by ITU-T | ISO/IEC In Table 6-9: When transfer_characteristics is not equal t
41、o 11 or 12, ER,EGand EB are analog with values between 0 and 1; When transfer_characteristics is equal to 11 (IEC 61966-2-4) or 12 (ITU-R Rec. BT.1361 extended colour gamut system), ER,EGand EB are analog with a larger range not specified in this Recommendation | International Standard; Nominal blac
42、k is considered to have the property ER= 0,EG= 0 and EB= 0; Nominal white is considered to have the property ER= 1,EG= 1 and EB= 1; If matrix_coefficients is not equal to 8, the following applies: EYis analog with the value 0 associated with nominal black and the value 1 associated with nominal whit
43、e; EPBand EPRare analog with the value 0 associated with both nominal black and nominal white; When transfer_characteristics is not equal to 11 or 12, EYhas values between 0 and 1; When transfer_characteristics is not equal to 11 or 12, EPBand EPRhave values between 0.5 and 0.5; When transfer_charac
44、teristics is equal to 11 (IEC 61966-2-4), or 12 (ITU-R Rec. BT.1361 extended colour gamut system), EY, EPBand EPRare analog with a larger range not specified in this Recommendation | International Standard; Y, Cb and Cr are related to EY, EPBand EPRby the following formulae: Y = max 0, min 255, Roun
45、d( ( 219 * EY) ) + 16 Cb = max 0, min 255, Round( ( 224 * EPB) ) + 128 Cr = max 0, min 255, Round( ( 224 * EPR) ) + 128 Otherwise (matrix_coefficients is equal to 8 (YCgCo), the following applies: R = 219 * ER+ 16 G = 219 * EG+ 16 B = 219 * EB+ 16 Y = max 0, min 255, Round( 0.5 * G + 0.25 * ( R + B
46、) ) Cb = max 0, min 255, Round( 0.5 * G 0.25 * ( R + B ) ) + 128 Cr = max 0, min 255, Round( 0.5 * (R B ) ) + 128 NOTE 1 For purposes of the YCgCo nomenclature used in Table 6-9, Cb and Cr of the above equations may be referred to as Cg and Co, respectively. The inverse conversion for the above thre
47、e equations should be computed as: t = Y ( Cb 128 ) G = Y + ( Cb 128 ) B = t ( Cr 128 ) R = t + ( Cr 128 ) NOTE 2 The decoding process given by this Recommendation | International Standard limits output sample values for Y, Cr and Cb to the range 0:255. Thus, sample values outside the range implied
48、by the above equations may occasionally occur at the output of the decoding process. In particular the sample values 0 and 255 may occur. ISO/IEC 13818-2:2000/Amd.2:2007 (E) ITU-T Rec. H.262 (2000)/Amd.2 (01/2007) 5 In the case that sequence_display_extension() is not present in the bitstream or colour_description is zero the matrix coefficients are assumed to be implicitly defined by the application. NOTE 3 In applications which may have signals with more than one set of colour primaries, transfer characteristics, and/or matrix coefficients, it is recommended to transmit a sequence display e
