Digital video coding system colorimetric characteristics referred toMPEG-2,
MPEG-4, MPEG-4/AVC
Digital video coding system colorimetric characteristics specified in MPEG-2 – H.262 | 13818-2 [3.15, 3.16], MPEG-4 – 14496-2 [3.17, 3.18], H.264 | MPEG-4/AVC – 14496-10 [3.19] are shown in the Tables 3.9, 3.10, 3.11, which combine according data from Tables 6-7, 6-8, 6-9 from standard 13818-2, Tables 6-8, 6-9, 6-10 from standard 14496-2 and Tables E-2, E-3, E-4 from standard 14496-10.
Primaries chromaticity coordinates and reference white for given parameter values of color_primaries are shown it Table 3.9.
Opto-electronic conversion characteristics – transfer primaries channels characteristics for given parameter values of transfer_characteristics are shown in Table 3.10. Table specifies:
Luminance signals and color-difference signals matrixes coefficients for given parameter values of transfer_characteristics are shown in Table 3.11. For maintaining form of coefficient definitions, accepted in standards, matrixes coefficients of ITU-T H.262 | ISO/IEC 13818-2 and ISO/IEC 14496-2 standards are given in 3 column; matrixes coefficients of ITU-T H.264 | ISO/IEC 14496-10 standard are given in 4 column through KR and KB, used for matrix conversion description as following:
(3.154)
(3.155)
(3.156)
with exception of cases when transfer_characteristics values are equal to 0 and 8.
Value 8 in ITU-T H.262 | ISO/IEC 13818-2, ISO/IEC 14496-2 and ITU-T H.264 | ISO/IEC 14496-10 accords to signal coding , processed by algorithms specified in these standards, where signals are in terms of .
Value 0 in ITU-T H.264 | ISO/IEC 14496-10 accords to coding space signals coding processed by algorithms specified in Annex E.2 of standard ITU-T H.264 | ISO/IEC 14496-10.
TABLE 3.9 Digital video coding system colour primaries referred to MPEG-2, MPEG-4, MPEG-4/AVC
color_primaries
Systems and standards
Primaries and reference white chromaticity coordinates
Forbidden (ISO/IEC 13818-2 and ISO/IEC 14486-2)
Reserved (ISO/IEC 14486-10)
For future use ITU-T/ISO/IEC
Recommendation ITU-R BT.709-5 [3.6]
Recommendation INTO-R BT.1361 [3.9], conventional color gamut system and extended color gamut system
IEC 61966-2-4 [3.13]
SMPTE 170M [3/2] (functionally the same as the value)
x
y
Red
0.640
0.330
Green
0.300
0.600
Blue
0.150
0.060
White D65
0.3127
0.3290
Unspecified
Image characteristics are unknown or are determined by the application
Reserved
For future use by ITU-T | ISO/IEC
ITU-R Recommendation BT.470-6 system M (historically)
ITU-R Recommendation BT.1700 [3.3], 625 PAL or 625 SECAM (ISO/IEC 14486-10)
NTSC 1953 Recommendation for transmission standards for color television
US FCC Title 47 Code of Federal Regulations (2004) 73.682 (a) (20)
x
y
Red
0.67
0.33
Green
0.21
0.71
Blue
0.14
0.08
White C
0.310
0.316
ITU-R Recommendation BT.1700 [3.3] 625 PAL or 625 SECAM
ITU-R Recommendation BT.1358 [3.5] 625
ITU-R Recommendation BT.601-6 [3.4] 625 (ISO/IEC 13818-2 and 14486-2)
ITU-R Recommendation BT.470-6 systems B, G (historically)
x
y
Red
0.64
0.33
Green
0.29
0.60
Blue
0.15
0.06
White D65
0.3127
0.3290
TABLE 3.9 (End)
ITU-R Recommendation BT.1700 [3.3] NTSC
ITU-R Recommendation BT.1358 [3.5] 525 (ISO/IEC 13818-2, 14486-2, 14486-10) or 625 (only ISO/IEC 14486-2)
SMPTE 170M [3.2] (functionally the same as the value 7)
ITU-R Recommendation BT.601-6 [3.4] 525 (ISO/IEC 13818-2)
x
y
Red
0.630
0.340
Green
0.310
0.595
Blue
0.155
0.070
White D65
0.3127
0.3290
SMPTE 240M [3.20] (functionally the same as the value 6)
x
y
Red
0.630
0.340
Green
0.310
0.595
Blue
0.155
0.070
White D65
0.3127
0.3290
Reserved (ISO/IEC 13818-2)
For future use by ITU-T | ISO/IEC
ISO/IEC 14486-2
ISO/IEC 14486-10
Generic film (color filters using standard illuminant C)
(ISO/IEC 14486-2, 14486-10)
x
y
Red
0.681
0.319
(Wratten 25)
Green
0.243
0.692
(Wratten 58)
Blue
0.145
0.049
(Wratten 47)
White C
0.310
0.316
9-255
Reserved
For future use by ISO/IEC
TABLE 3.10 Digital video coding system transfer signal source characteristics referred to MPEG-2, MPEG-4, MPEG-4/AVC
transfer_characteristic
Systems and standards
Transfer characteristic
Forbidden (ISO/IEC 13818-2 and ISO/IEC 14486-2)
Reserved (ISO/IEC 14486-10)
For future use ITU-T/ISO/IEC
Recommendation ITU-R BT.709-5 [3.6]
Recommendation ITU-R BT.1361 [3.9] conventional color gamut system
(functionally the same as the value 6)
Unspecified
Image characteristics are unknown or are determined by the application
Reserved
For future use by ITU-T/ISO/IEC
ITU-R Recommendation BT.470-6 system M (historically)
Recommendation BT.1700 [3.3] 625 PAL or 625 SECAM (ISO/IEC 14486-2)
US NTSC 1953 Recommendation for transmission standards for color television
US FCC Title 47 Code of Federal Regulations (2004) 73.682 (a) (20)
Assumed displayed gamma 2.8 (this value conflicts with ITU-R Recommendation BT.1700 (2007 revision) and accordingly to this Recommendation has to be changed to 2.2)
ITU-R Recommendation BT.1700 [3.3] 625 PAL or 625 SECAM (ISO/IEC 13818-2, 14496-10)
ITU-R Recommendation BT.470-6 systems B, G (historically)
Assumed displayed gamma 2.8 (this value conflicts with ITU-R Recommendation BT.1700 (2007 revision) and accordingly to this Recommendation has to be changed to 2.2)
TABLE 3.10 (End)
ITU-R Recommendation BT.1700 [3.3] NTSC
ITU-R Recommendation BT.1358 [3.6] 525 or 625
SMPTE 170M [3.2] (functionally the same as the value 1)
ITU-R Recommendation BT.601-6 [3.4] 625 (ISO/IEC 13818-2 and 14486-2)
See Eq. 3.141
SMPTE 240M (1987) [3.21]
Opto-electronic conversion:
Linear transfer characteristic
(ISO/IEC 13818-2, ISO/IEC 14486-2)
(ISO/IEC 14486-10)
Logarithm transfer characteristic (100:1 range)
Logarithm transfer characteristic (316.22777:1 range )
(in ISO/IEC 14486-2: )
IEC 61966-2-4 [3.13]
Recommendation ITU-R BT.1361 [39], extended color gamut system
(3.164)
9-255
Reserved for future use ITU-T/ISO/IEC
Table 3.11 Matrix coefficients defined for video coding system referred to MPEG-2, MPEG-4, MPEG-4/AVC
matrix_coefficients
Systems and standards
Matrix
ISO/IEC 13818-2
ISO/IEC 14486-2
ISO/IEC 14486-10
Forbidden
RGB
Recommendation ITU-R BT.709-5 [3.6]
Recommendation ITU-R BT.1361 [3.9], conventional color gamut system and extended color gamut system
IEC 61966-2-4 xvYCC709 [3.13]
SMPTE RP 177 Annex B [3.1]
Unspecified. Image characteristics are unknown or determined by the application
Reserved. For future use ITU-T/ISO/IEC
US NTSC 1953 Recommendation for transmission standards for color television
US FCC Title 47 Code of Federal Regulations (2004) 73.682 (a) (20)
ITU-R Recommendation BT.1700 [3.3] (2007 revision) 625 PAL and 625 SECAM
ITU-R Recommendation BT.1358 [3.5] 625
IEC 61966-2-4 xvYCC709 [3.13]
ITU-R Recommendation BT.470-6 systems B, G (historical) (Functionally the same as the value 6)
ITU-R Recommendation BT.601-6 [3.4] 625 (Functionally the same as the value 6) (ISO/IEC 13818-2, ISO/IEC 14486-2)
TABLE 3.11 (Continued)
ITU-R Recommendation BT.1700 [3.3] (2007 revision) NTSC
ITU-R Recommendation BT.1358 [3.5] 525
SMPTE 170M [3.2]
IEC 61966-2-4 xvYCC601 [3.13] (Functionally the same as the value 5)
ITU-R Recommendation BT.470-6 systems B, G (historical) (Functionally the same as the value 6)
ITU-R Recommendation BT.601-6 [3.4] 525 (Functionally the same as the value 5) (ISO/IEC 13818-2, 14496-2)
SMPTE 240M (1987) [3.21]
YCgCo
9-255
Reserved. For future use ITU-T/ISO/IEC
TABLE 3.11 Continued)
is analog with the value 0 associated with nominal black and the value 1 associated with nominal white;
and are analog with the value 0 associated with both nominal black and nominal white;
When transfer_characteristics is not equal to 11 or 12, has values between 0 and 1;
When transfer_characteristics is not equal to 11 or 12, and have values between -0.5 and 0.5;
When transfer_characteristics is not equal to 11 (IEC 61966-2-4) or 12 (ITU-R Recommendation BT.1361 extended color gamut system), are analog with a larger range not specified in this International Standard;
are related to by the following formulae:
If video_range is equal to 0:
If video_range is equal to 1:
for n bit video.
– If matrix_coefficients is equal to 8 , the following applies:
If video_range is equal to 0:
TABLE 3.11 (End)
Note 1 – For purposes of the nomenclature used in Table, and d in the above equations may be referred to as and , respectively. The inverse conversion for the above three equations should be computed as:
Note 2 – The decoding process given in the Recommendation | International standard limits output sample values for Y, Cr and Cb to the range[0:255]. Thus, sample values :outside the range implied by the above equations may occasionally occur at the output of the decoding process/ In particular the sample values 0 and 255 may occur
In the case that sequence_display_extension() is not present in the bitstream or color_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 color primaries, transfer characteristics, and/or matrix coefficients, it is recommended to transmit a sequence display extension with color_description set to one, and to specify the appropriate values for the colorimetry parameters.
If video_range is equal to 0:
for n bit video.
are related to R, G and B by the following formulae:
Note – For purposes of the nomenclature used in Table, and in the above equations may be referred to as and , respectively. The inverse conversion for the above three equations should be computed as:
In the case that video_signal_type() is not present in the bitstream or color_description is zero the matrix coefficients are assumed to be those corresponding to matrix_coefficients having the value 1.
In the case that video_signal_type() is not present in the bitstream, video_range is assumed to have the value 0 (a range of Y from 16 to 235 for 8-bit video).