Recommendation itu-r bt. 709-4 parameter values for the hdtv standards for production and international programme exchange




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Rec. ITU-R BT.709-4

RECOMMENDATION ITU-R BT.709-4

PARAMETER VALUES FOR THE HDTV STANDARDS FOR PRODUCTION
AND INTERNATIONAL PROGRAMME EXCHANGE

(Question ITU-R 27/11)

(1990-1994-1995-1998-2000)

Rec. ITU-R BT.709-4
The ITU Radiocommunication Assembly,

considering

a) that, for many years, HDTV programmes has 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 that 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 Parts 1 or 2 of this Recommendation, should be used;

2 that for new HDTV programme production and international exchange, systems described in Part 2 are preferred.

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

(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



Item

Parameter

Value

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 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)

Primary

Red (R)


– Green (G)
– Blue (B)


x

y

0.640
0.300
0.150


0.330
0.600
0.060


1.4

Assumed chromaticity for equal primary signals

(Reference white)




ER  EG  EB





D65

x

y

0.3127

0.3290


2 Picture characteristics



Item

Parameter

Value

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


3 Picture scanning characteristics



Item

Parameter

Value

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%

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