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Recommendation ITU-R BT.709-5
(04/2002)
Parameter values for the HDTV
standards for production and
international programme
exchange
BT Series
Broadcasting service
(television)
ii Rec. ITU-R BT.709-5
Foreword
The role of the Radiocommunication Sector is to ensure 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 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 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 patent 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 (television)
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 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, 2009
© ITU 2009
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU.
Rec. ITU-R BT.709-5
1
RECOMMENDATION ITU-R BT.709-5
*
Parameter values for the HDTV
**
standards for production
and international programme exchange
(Question ITU-R 27/11)
(1990-1994-1995-1998-2000-2002)
Scope
This Recommendation defines the image format parameters and values for HDTV. Part 1 of this
Recommendation is not in current use and is included to capture historic evolution of the Recommendation.
Part 2 of the Recommendation is widely deployed; implementers of broadcasting technologies should apply
the values contained in Part 2.
The ITU Radiocommunication Assembly,
considering
a) that for many years HDTV programmes have been produced in several countries;
b) that parameter values for HDTV production standards should have maximum commonality;
c) that two HDTV scanning standards, 1125/60/2:1 and 1250/50/2:1, were previously
developed for that purpose, having a significant number of parameters which have been agreed on
a worldwide basis, and for which some equipment remains in use;
d) that a HDTV common image format of 1 920 pixels by 1080 lines providing square pixel
sampling and a number of interlace and progressive picture rates has been designed for digital
television, computer imagery and other applications (in this Recommendation, the term pixel is
used to describe a picture element in the digital domain);
e) that the parameters defined for all these systems meet the quality goals set for HDTV;
f) that film productions are an important programme source for HDTV broadcasting and,
conversely, the use of HDTV production systems has significant benefits for film programme
production;
g) that high-quality conversion between the various HDTV systems, as well as down-
conversion to 525/625 television systems, has been successfully implemented;
h) that programmes produced and archived will not become obsolete using these standards,
recommends
1 that for HDTV programme production and international exchange, one of the systems
described in Part 2 of this Recommendation, should be used.
*
Radiocommunication Study Group 6 made editorial amendments to this Recommendation in 2009 in
accordance with Resolution ITU-R 1.
**
“A high-definition system is a system designed to allow viewing at about three times the picture height,
such that the system is virtually, or nearly, transparent to the quality of portrayal that would have been
perceived in the original scene or performance by a discerning viewer with normal visual acuity.” Report
ITU-R BT.801.
Rec. ITU-R BT.709-5
2
Signal parameter values for the 1125/60/2:1 system
and the 1250/50/2:1 system
Part 1
HDTV systems related to conventional television
1
(The areas in bold characters in the Tables below denote parameter values which have been agreed to
on a worldwide basis.)
1 Opto-electronic conversion
2 Picture characteristics
1
This Part 1 specifies parameter values used in the early days of analogue high definition television
implementation. It is provided here in recognition of the fact that it is no longer in use today, but vintage
HDTV programs of historical values still exist in the form of analogue video tape recordings, that may
occasionally need to be played back on appropriate equipment.
Value
Item Parameter
1125/60/2:1 1250/50/2:1
1.1
Opto-electronic transfer characteristics
before non-linear precorrection
Assumed linear
1.2
Overall opto-electronic transfer
characteristics at source
V = 1.099 L
0.45
– 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
x y 1.3 Chromaticity coordinates (CIE, 1931)
Primary
– Red (R)
– Green (G)
– Blue (B)
0.640
0.300
0.150
0.330
0.600
0.060
D
65
x y
1.4
Assumed chromaticity for equal primary
signals
(Reference white)
E
R
=
E
G
=
E
B
0.3127 0.3290
Value
Item Parameter
1125/60/2:1 1250/50/2:1
2.1 Aspect ratio 16:9
2.2 Sample per active line 1920
2.3 Sampling lattice Orthogonal
2.4 Active lines per picture 1035 1152
Rec. ITU-R BT.709-5 3
3 Picture scanning characteristics
4 Signal format
The terms R, G, B, Y, C
B
, C
R
, are often used and are generally understood to refer to the signals ,
R
E
′
,
G
E
′
,
B
E
′
,
Y
E
′
,
B
C
E
′
R
C
E
′
respectively (i.e. they correspond to gamma pre-corrected signals).
Value
Item Parameter
1125/60/2:1 1250/50/2:1
3.1 Order of sample scanning
Left to right, top to bottom 1st line of
field 1 above 1st line of field 2
3.2 Interlace ratio 2:1
3.3 Picture rate (Hz) 30 25
3.4 Total number of lines 1125 1250
3.5 Field frequency (Hz) 60 50
3.6 Line frequency (Hz) 33 750 ± 0.001% 31 250 ± 0.0001%
Value
Item Parameter
1125/60/2:1 1250/50/2:1
4.1 Conceptual non-linear precorrection of primary signals
γ = 0.45
(see item 1.2)
4.2 Derivation of luminance signal
)1(
Y
E
′
Y
E
′
= 0.2126
R
E
′
+
0.7152
G
E
′
+
0.0722
B
E
′
Y
E
′
= 0.299
R
E
′
+
0.587
G
E
′
+
0.114
B
E
′
4.3 Derivation of colour-difference signal (analogue coding)
(1)
B
C
E
′
= 0.5389
B
E
′
( – )
Y
E
′
R
C
E
′
= 0.6350
R
E
′
( – )
Y
E
′
B
C
E
′
= 0.564
B
E
′
( – )
Y
E
′
R
C
E
′
= 0.713
R
E
′
( – )
Y
E
′
4.4
Derivation of colour-difference signal (digital
coding) C
B
, C
R
Digitally scaled from the values of item 4.3
(1)
The coefficients for the equations have been calculated following the rules laid down in SMPTE RP177-1993.
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