1、 Recommendation ITU-R BT.1847-1 (06/2015) 1 280 720, 16:9 progressively-captured image format for production and international programme exchange in the 50 Hz environment BT Series Broadcasting service (television) ii Rec. ITU-R BT.1847-1 Foreword The role of the Radiocommunication Sector is to ensu
2、re the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of
3、the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in
4、 Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R pat
5、ent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (t
6、elevision) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed
7、 service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2015 ITU
8、 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.1847-1 1 RECOMMENDATION ITU-R BT.1847-1 1 280 720, 16:9 progressively-captured image format for production and international programme exchange in the 5
9、0 Hz environment (Question ITU-R 1/6) (2008-2015) Scope This Recommendation provides the parameters for a 1 280 720, 16:9 progressively scanned television format for the 50 Hz environment for production and programme exchange1. Keywords Progressive, 1280 720 The ITU Radiocommunication Assembly, cons
10、idering a) that the 720/P image format provides a resolution between Recommendations ITU-R BT.601 and ITU-R BT.709, which is an option for certain applications of acquisition, production and storage; b) that digital content production will increasingly include a mixture of audio, video, data and int
11、eractive content; c) that image format interoperability with computer applications is increasingly important, and the 720/P format is well matched to them because of the square pixels format; d) that production-quality conversion between formats is facilitated by progressive image capture; e) that a
12、 720/P production format offers a resolution format that can be carried within the commonly used 1.5 Gbit/s production serial digital interface; f) that Recommendation ITU-R BT.1543 gives the parameter values for a 720/P 60 Hz format; g) that there is digital production equipment designed to operate
13、 with a variety of image formats including 1 280 720, 16:9, progressively-captured (720/P), recognizing a) that Recommendation ITU-R BT.709 is the recognized standard for high-definition television in the ITU; b) that this Recommendation should have no impact on Recommendations (ITU-R BT.601 and ITU
14、-R BT.709) referred to in recommends 1, 1 Previous versions of this Recommendation that may contain historic information can be found on the ITU website. 2 Rec. ITU-R BT.1847-1 recommends that, where there may be a requirement for a resolution between the video formats specified in Recommendations I
15、TU-R BT.601 and ITU-R BT.709 for production and international programme exchange in the 50 Hz environment, the parameters in Annex 1 should be used. Annex 1 1 280 720 progressive capture system at 50 Hz 1 Opto-electronic conversion2 Item Parameter Value 1.1 Opto-electronic transfer characteristics b
16、efore non-linear pre-correction Assumed linear 1.2 Overall opto-electronic transfer characteristics at source3 V = 1.099 L0.45 0.099 for 1 L 0.018 V = 4.500 L for 0.018 L 0 where: L : luminance of the image 0 L 1 V : corresponding electrical signal 1.3 Chromaticity coordinates (CIE, 1931) X y Primar
17、y: Red (R) Green (G) Blue (B) 0.640 0.300 0.150 0.330 0.600 0.060 1.4 Assumed chromaticity for equal primary signals (reference white): D65 X y ER = EG = EB 0.3127 0.3290 2 Opto-electronic conversion refers to the conversion of an optical signal (light stimulus) into an electrical signal, and vice v
18、ersa. In the context of this Recommendation, the stimulus signal is produced by a digital imaging device. 3 In typical production practice the encoding function of image sources is adjusted so that the final picture has the desired look, as viewed on a reference monitor having the reference decoding
19、 function of Recommendation ITU-R BT.1886, in the reference viewing environment defined in Recommendation ITU-R BT.2035. Although some parameters listed in Recommendation ITU-R BT.2035 are intended for HDTV signal viewing, scaled viewing distances for 1 280 720/P signals should be used. Rec. ITU-R B
20、T.1847-1 3 2 Picture characteristics Item Parameter Value 2.1 Aspect ratio 16:9 2.2 Samples per active line 1 280 2.3 Sampling lattice Orthogonal 2.4 Active lines per picture 720 2.5 Pixel aspect ratio 1:1 (square pixels) 3 Signal format Item Parameter Value 3.1 Conceptual non-linear pre-correction
21、of primary signals = 0.45 (See Item 1.2) 3.2 Derivation of luminance signal YE YE = 0.2126 RE + 0.7152 GE + 0.0722 BE 3.3 Derivation of colour-difference signal (analogue coding) 8556.1 YBCB EEE 8556.1 9278.07152.02126.0 BGR EEE 5748.1 YRCR EEE 5748.1 0722.07152.07874.0 BGR EEE 3.4 Quantization of R
22、GB, luminance and colour-difference signals(1), (2) 8216219IN T nRR ED 8216219IN T nGG ED 8216219IN T nBB ED 8216219IN T nYY ED 82128224IN T nCBCB ED 82128224IN T nCRCR ED 3.5 Derivation of luminance and colour-difference signals via quantized RGB signals BGRY DDDD 0722.07152.02126.0I N T 1221922485
23、56.19278.08556.17152.08556.12126.0IN T nBGRCBDDDD 122192245748.10722.05748.17152.05748.17874.0IN T nGRCRBDDDD (1) “n” denotes the number of the bit length of the quantized signal. (2) The operator INT returns the value of 0 for fractional parts in the range of 0 to 0.4999 . and +1 for fractional par
24、ts in the range of 0.5 to 0.9999 ., i.e. it rounds up fractions above 0.5. 4 Rec. ITU-R BT.1847-1 4 Digital representation Item Parameter Value 4.1 Coded signal R, G, B or Y, CB, CR 4.2 Sampling lattice: R, G, B, Y Orthogonal, line and picture repetitive 4.3 Sampling lattice: CB, CR Orthogonal, line
25、 and picture repetitive co-sited with each other and with alternate(1) Y samples 4.4 Number of active samples per line: R, G, B, Y CB, CR 1 280 640 4.5 Coding format Linear 8 or 10 bits/component 4.6 Quantization levels: 8-bit coding 10-bit coding Black level: R, G, B, Y Achromatic: CB, CR Nominal p
26、eak: R, G, B, Y CB, CR 16 128 235 16 and 240 64 512 940 64 and 960 4.7 Quantization level assignment: 8-bit coding 10-bit coding Video data Timing references 1 through 254 0 and 255 4 through 1 019 0-3 and 1 020-1 023 4.8 Filter characteristics(2): R, G, B, Y CB, CR See Fig. 1a See Fig. 1b (1) The f
27、irst active colour-difference samples being co-sited with the first active luminance sample. (2) These filter templates are defined as guidelines. 5 Picture capture characteristics Item Parameter Value 5.1 Order of sample presentation in a scanned system Left to right, top to bottom 5.2 Frame freque
28、ncy (Hz) 50 5.3 Picture rate (Hz) 50 5.4 Samples per full line: R, G, B, Y CB, Cr 1 980 990 5.5 Nominal channel bandwidths (MHz) (For R, G, B, Y components) 30 5.6 Sampling frequency (MHz): R, G, B, Y 74.25 5.7 Sampling frequency(1) (MHz): CB, CR 37.125 (1) CB, CR sampling frequency is half of lumin
29、ance sampling frequency. Rec. ITU-R BT.1847-1 5 FIGURE 1A Filter characteristics for R, G, B and Y signals B T . 1 8 4 7 - 0 1 AInsertionloss(dB)504030201000 . 4 00Fre q u en cy (t i mes )fsb ) Pas s b an d ri p p l e t o l eran ce0 0 .0 7 500 . 0 7 50 . 1 1 0Groupdelay()TFre q u en cy (t i mes )fsI
30、nsertionloss(dB)5 0 d B4 0 d B1 2 d B00a) T emp l at e fo r i n s ert i o n l o s sFre q u en cy (t i mes )fs0.1dBc) Pas s b an d g ro u p -d el ay0 . 0 5 0 .0 50.15T0.22T 0 .1 1 00 . 2 7 0 . 4 00 . 4 0 0 . 5 0 0 . 6 0 0 . 7 3 1 . 0 0NOTE 1 s denotes luminance sampling frequency, the value of which
31、is given in item 5.6. NOTE 2 Ripple and group delay are specified relative to the value at 100 kHz. 6 Rec. ITU-R BT.1847-1 FIGURE 1B Filter characteristics for CB and CR signals B T . 1 8 4 7 - 0 1 BInsertionloss(dB)504030201000 . 2 00Freq u en cy (t i mes )fsb ) Pas s b an d ri p p l e t o l eran c
32、e0 0 .0 7 500 . 0 7 50 . 1 1 0Groupdelay()TFreq u en cy (t i mes )fsInsertionloss(dB)5 0 d B4 0 d B6 d B00a) T emp l at e fo r i n s ert i o n l o s sFreq u en cy (t i mes )fs0.1dBc) Pas s b an d g ro u p -d el ay0 . 0 5 0 .0 50.15T0.22T 0 .1 1 00 . 1 4 0 . 2 00 . 2 0 0 . 2 5 0 . 3 0 0 . 3 7 0 . 5 0
33、NOTE 1 s denotes luminance sampling frequency, the value of which is given in item 5.6. NOTE 2 Ripple and group delay are specified relative to the value at 100 kHz. 6 Analogue Tri Level Sync signal The trilevel sync signal may be used as a reference signal for synchronization of devices operating o
34、n this Recommendation. Rec. ITU-R BT.1847-1 7 Item Parameter Value 6.1 Nominal level (mV): ,RE ,GE ,BE YE Reference black: 0 Reference white: 700 (See Fig. 2) 6.2 Nominal level (mV): ,BCE RCE 350 (See Fig. 2) 6.3 Form of synchronizing signal Tri-level bipolar (See Fig. 4) 6.4 Line sync timing refere
35、nce OH (See Fig. 4) 6.5 Sync level (mV) 300 2% 6.6 Sync signal timing Sync on all components (See Table 1, Figs 3 and 4) 6.7 Inter-component timing accuracy Not applicable 6.8 Blanking interval (See Table 2 and Fig. 3) 6.9 Total lines 750 FIGURE 2 Analogue levels and OH timing reference B T . 1 8 4
36、7 - 0 2+ 7 0 0+ 3 0 00300+ 3 5 0+ 3 0 00300350(mV)Bl an k i n g i n t erv alOH8 Rec. ITU-R BT.1847-1 TABLE 1 Level and line timing specification (see Figs 3and 4) Symbol Parameter System values T Reference clock interval (s) 1/74.25 a Negative line sync width (T )(1) 40 3 b End of active video(2) (T
37、 ) +6 440 0 c Positive line sync width (T ) 40 3 d Clamp period (T ) 110 3 e Start of active video (T ) +6 260 0 f Rise/fall time (T ) 4 1.5 t2 t1 Symmetry of rising edge Symmetric about Tr Active line interval (T ) +0 1 280 12 Sm Amplitude of negative pulse (mV) 300 6 Sp Amplitude of positive pulse
38、 (mV) 300 6 V Amplitude of video signal (mV) 700 (1) T denotes the duration of a reference clock or the reciprocal of the clock frequency. (2) A line starts at line sync timing reference OH (inclusive) and ends just before the subsequent OH (exclusive). TABLE 2 Frame timing specification (see Figs 3
39、 and 4) Symbol Parameter System values H(1) Total line interval (T )(2) 1 980 h Vertical sync width (T ) 1 280 3 LT Top line of picture No. 26 LB Bottom line of picture No. 745 WBL Frame blanking interval 30 H Start of frame No. 1 End of frame No. 750 (1) H denotes the duration of a line. A line sta
40、rts at line sync timing reference OH (inclusive) and ends at just before the subsequent OH (exclusive). (2) T denotes the duration of a reference clock or the reciprocal of the clock frequency (see Table 1). Rec. ITU-R BT.1847-1 9 FIGURE 3 Frame synchronizing signals waveform BT.1847-03feWBL5HOVVert
41、icalintervalLBNo.745No.750No.2No.1No.3No.4No.5No.7No.6LTNo.26fh1lineOHOHVerticalsyncdetail10 Rec. ITU-R BT.1847-1 FIGURE 4 Line synchronizing signals waveform B T . 1 8 4 7 - 0 4Sm/2OH(T h e w av efo rm ex h i b i t s s y mmet ry w i t h res p ect t o p o i n t T )rSpSp/2SmV/2Trt1t2V/2ff f fba cde90%10%
