1、RP 219-2002 SMPTE RECOMMENDED PRACTICE Hig h-Def inition, Standard-Definition Compatible Color Bar Signal Page 1 of 15 pages 1 Scope This practice specifies a color bar pattern compatible with both high- and standard-definition environments. The multi-format color bar signal is originated as an HDTV
2、 signal with an aspect ratio of 16:9 and may be down converted to an SDTV color bar signal with an aspect ratio of either 4:3 or 16:9. The color bar signal is generated with unconventionally slow rise and fall time value, and is therefore only intended to facilitate video level control and monitor c
3、olor adjustments (see note) of HDTV and SDTV equipment. It can be applied to HDTV video productions, especially in a multi-format environment where HDTV video sources are frequently converted and used as SDTV video content either in 525 or 625 environment with same frame frequencies as in the origin
4、al HDTV signal. NOTE - This signal should not be used to set luminance level or black or white color balance on monitors. The small size and off-center locations of the black and white bars are not suitable for this purpose, especially on CRT-based displays 2 Color bar signal structure The multi-for
5、mat color bar signal shall be composed of four specific patterns, shown in figure 1. Arrangement of patterns The first part of the color bar signal represents a signal for the 4x3 aspect ratio; a second part of the total signal adds additional side panels for the 16x9 aspect ratio. A third part adds
6、 black and white ramps and additional color information, and the last part completes the total signal by adding white and black bars, in addition to a set of near-black-level steps for monitor black level adjustment. Pattern 1 shall consist of a 75% color bar signal within a 4:3 aspect ratio area, w
7、ith 40% gray signals (see note 1) positioned on either side of the 4:3 area. (sub-pattern *1 in figure 1). Pattern 2 shall consist of the chroma setting signal (75% white) within the 4:3 area, with 100% cyan and 100% blue signals to the left and right sides respectively. Additionally, a signal in th
8、e sub-pattern area marked *2 in figure 1 shall be selectable from 75% white, 100% white, + I signal and -I signal options, according to the users operational preference (see note 4) The + I signal shall have the following component values: R = 41.2545 IRE, G= 16.6946 IRE and B= O IRE (see note 6) Th
9、e -I signal shall have the following component values: R = O IRE, G= 24.5600 IRE and B= 41.2545 IRE Copyright Q2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Harisdale Ave., white Plains, NY 10607 (914) 761-llM) .Approved June 19,2002 RP 219-2002 Pattern 3 shall consist of a r
10、amp signal, with 100% yellow and 100% red signals to the left and right sides respectively. The ramp signal is designed for checking specific bit failures that may occur in digital processing. The ramp shall be a linear slope of luminance from 0% to 100% white. Additionally a signal in the sub-patte
11、rn area marked *3 in figure 1 shall be selectable from 0% black and +Q signal options, according to the users operational preference (see note 5). The + Q signal shall have the following component values: R = 25.3605 IRE, G= O IRE and B= 47.0286 IRE Pattern 4 shall consist ,of a 100% white signal, a
12、 0% black signal and a set of near-black signals for HDTV and SDTV monitor black level adjustment see note 31. The 15% gray signal panels are then added at each end of pattern 4 (see note 2). NOTES 1 The sub-pattern area marked 1 within pattern 1 in figure 1 (single bar on right and left of pattern
13、1) shall be set to 40% gray as a default value. This value can be optionally adjustable to any other value in accordance with the operational requirements of the user. 2 The sub-pattern area marked 4 within pattem 4 in figure 1 (single bar on right and left of pattern 4) shall be set to 15% gray as
14、a default value. This value can be optionally adjustable to any other value in accordance with the operational requirements of the user 3 These signals are known collectively as PLUGE (PLUGE: Picture Line Up Generating Equipment). For specific instruction see SMPTE EG 1, section 4.2 4 When the -I si
15、gnal is selected in sub-pattern *2, it is required that a +Q signal be simultaneously selected in sub- pattern 3. 5 When the +Q signal is selected in sub-pattern *3, it is required that a -I signal be simultaneously selected in sub- pattem 2. 6 For explanation of IRE see SMPTE 170M, annex B Page 2 o
16、f 15 pages U j m u m $ i c f: rn c jh ,-.“. n 0: RP 2142002 2.1 Rise and fall times of bar transitions It is required that implementers of this standard follow practices of proper shaping (rise and fall times for bar transitions) for individual bars. Nominal values for rise and fall time of the HDTV
17、 color bars shall be identical for luminance and PR / PB signals, and set to 55 mec. These rise and fall time definitions are based on a transition from 10% to 90%. The tolerance on the nse/fall times is set to 5 10% of the nominal value. The actual shape of the transition should be similar to integ
18、rated sine-squared pulse shape. The rise and fall times of the down converted SDTV color bar signal may follow the recommendation of either ITU R BT.801-1 or SMPTE 170M. 2.2 Waveforms NOTE - Values shown in figures 2 through 9 are associated with a 10-bit digital system; values shown in parentheses
19、are associated with an 8-bit digital system. 2.2.1 Pattern 1 Waveforms defining pattern 1 are shown in figure 2. Y PB PR R ! B i Gray i ! Figure 2 - Pattern 1 waveforms Page 4 of 15 pages RP 219-2002 2.2.2 Pattern 2 Waveforms defining pattern 2 are shown iri figures 3 through 6. (a) Sub-pattern *2 s
20、et to 75% white signal (16) Figure 3 - Pattern 2 waveforms with 75% white signal (in *2 sub-pattern) (b) Sub-pattern *2 set to 100% white signal: j cy i10oxw 75%W Figure 4 - Pattern 2 waveforms with 100% white signal (in *2 sub-pattern) Page 5 of 15 pages RP 219-2002 (c) Sub-pattern *2 set to +I sig
21、nal: CY i +I i 75%W :Bi . 72 1 Figure 5 - Pattern 2 waveforms with +I signal (in 2 sub-pattern) (d) Sub-pattern *2 set to - I signal: I 960 I PR Figure 6 - Pattern 2 waveforms with - I signal (in *2 sub-pattern) Page 6 of 15 pages RP 219-2002 2.2.3 Pattern 3 Waveforms defining pattern 3 are shown in
22、 figures 7 and . a) Sub-pattern *3 set to black signal: Y PB PR 512 Figure 7 - Pattern 3 waveforms with black signal (in 3 sub-pattern) Sub-pattern *3 set to +Q Y PB PR signal: Figure 8 - Pattern 3 waveforms with +Q signal (in *3 sub-pattern) Page 7 of 15 pages RP 21 9-2002 2.2.4 Pattern 4 Waveforms
23、 defining pattern 4 are shown in figure 9. (128) Figure 9 -Waveforms for pattern 4 3 Use of the color bar signal The multi-format color bar signal embodies a single signal constructed from the combination of a 100% color bar signal used in HDTV and a 75% color bar signal used in SDTV. Based on the d
24、ifference in aspect ratio between HDTV and SDTV, a 4:3 aspect ratio center section is utilized as a common area for both SDTV and HDTV signals, while the outside of this area is utilized for HDTV only. This color bar signal format therefore serves both HDTV and SDTV systems,. Additionally, it provid
25、es facilities for easy control of video source level and other operations such as monitor adjustments. NOTE - Values associated with % are related to a full value of the signal based on 100% of a full digital signal, defined in a relevant signal format document. 3.1 .I Adjustment of a composite pict
26、ure monitor Turning on the blue channel only in the monitor, chroma gain and chroma phase are adjusted to give the same brightness level in each main blue bar and the 75% white signal below, in a manner similar to the use of SMPTE color bars as defined in EG 1. 3.1.2 Adjustment of a component pictur
27、e monitor Turning on the blue channel only in the monitor, Pg gain is adjusted to give the same brightness level in the blue bars and the 75% white signal area located below the blue bars. Turning on the red channel only in the monitor, PR gain is adjusted to give the same brightness level in the re
28、d bars and the 75% white signal area located below the red bars. Page 8 of 15 pages R P 21 9-2002 3.2 Ramp signal A “Y ramp signal“ located in the middle of the screen as part of pattern 3 allows easy monitoring of specific bit failures in a luminance signal. 3.3 PLUGE signals for picture monitor bl
29、ack level setup The PLUGE signals (note 3) in pattern 4 (-2, O, +2, O and +4%) are a combination of signal sequences for HDTV and for SDTV monitor use. The sequence (-2, O, +2%) is intended for HDTV use and the sequence (+2, O, +4%) is intended for SDTV use. 3.3.1 Adjustment of black level in an HDT
30、V picture monitor To set the black level in an HDTV picture monitor, the brightness control is adjusted until the +2% step is visible with respect to the black surround but the -2% step is not visible (note 7). 3.3.2 Adjustment of black level in an SDTV monitor To set the black level in an SDTV pict
31、ure monitor, the monitor brightness control is adjusted until the +2% and +4% steps are visible with respect to the black surround but the -2% step is not visible (note 8). 3.4 100% white signal (pattern 4) This signal provides the standard level of 100% brightness and is also used for the white bal
32、ance adjustment of a picture monitor. 3.5 User-selectable bar (75% white, or 100% white, or + or- I signal (sub-pattern *2) The selection is based on individual operating practices and environments as follows: 3.5.1 75% white This signal is used when neither a +(-) I signal nor 100% white is require
33、d. 3.5.2 100% white This signal is used to facilitate level setting: the amplitude of the chroma in the 75% color bar signal is adjusted to be equal to the level of the 100% white signal in the waveform of an NTSC composite signal (displayed at V rate). 3.5.3 + I or - I signal This signal is located
34、 on the I axis of an NTSC vector-scope; its amplitude is equal to the burst level in the composite signal. Since skin tone colors are located in the neighborhood of the +I axis, the +I signal may be used as a reference skin color signal with HDTV systems, providing a color reference similar to that
35、available in NTSC or PAL systems. NOTES 7 The signal sequence of -2%, O and +2% was adopted in accordance with ARIB TR-B1 O. 8 The signal sequence of +2%, O and +4% is in harmony with SMPTE EG 1. Although SMPTE EG 1 recommends A% for the black level setting signal, this sequence was adopted consider
36、ing the current environment where negative signai excursions are often clipped in the process of down conversion from HDTV to SDTV. Page 9 of 15 pages R P 21 9-2002 Annex A (informative) Setup and colorimetry Al Setup for composite signals The composite encoded color bar signal of a 525-line televis
37、ion system used in American broadcasting shall contain a “set up“ signal. However, this set up signal is not present in 525-line composite encoded signal television systems used in Japan or in a 625-line television system used in Europe. SMPTE 170M defines parameters of all elements present in a com
38、posite encoded signal, including the set up signai. Set up is an offset signal of 7.5 IRE units amplitude, which is added to the black level of the luminance channel in the composite encoded signal during the final stages of the encoding process. The purpose of the set up signal is to ensure proper
39、representation of image information close to black level in a television monitor, by avoiding non-linearity near the cut off point of a CRT-based television display. 412 Colorimetry of the direct and downtonverted color bar signals Reference should be made to published signal standards for HDTV and
40、SDTV for definitions of the colorimetry relevant to the respective signal formats. Equipment designers should be aware that an appropriate colonmetry conversion process between the HDTV and the down-converted SDTV color bar signals is recommended (refer to SMPTE EG 6). Page IO of 15 pages RP 219-200
41、2 Iy Annex B (informative) Digital coding values for 8-, 10- or 12-bit implementation of color bar signal 8-bit 188 1 80 32 1 O-bit 754 721 127 The following are the tabulated recommended digital coding values for 8-, lo-, or 12-bit implementations of the color bar signal. (The calculated tabulated
42、values are based on fomulas of the SMPTE 274M.) 8-bit 1 O-bit Pattern 1 CY 1OO%W 75%W B 188 235 180 32 754 940 721 127 Pattern 2 8-bit I 154 I 128 I 128 I 240 1 O-bit I 615 I 512 I 512 I 960 I (a) 75% White signal selected: I CY I 75%w I B i CB 1 54 1 28 61 5 51 2 51 2 I I 12-bit I 3015 I 2884 I 509
43、 I 8-bit I 154 I 128 I 240 12-bit 8-bit 1 O-bit 1 2-bit 8-bit 1 O-bit 51 2 2459 2048 2048 3840 16 128 128 118 I I 12-bit I 256 I 2048 I 1884 I I I I CR I 2884 I 509 I I 12-bit I 3015 I 3760 I 1 O-bit I 64 I 512 I 512 I 471 12-bit I 256 I 2048 I 2048 I 1884 Page 11 of 15 pages RP 21 9-2002 Page 12 of
44、 15 pages RP 219-2002 Y CB Pattern 3 8-bit 188 35 235 63 1 O-bit 754 141 940 250 12-bit 301 5 564 3760 1 O01 8-bit 1 54 1 74 128 1 02 1 O-bit 61 5 697 51 2 409 12-bit 2459 2787 2048 1637 (a) Black signal selected: I CR (b) +Q signal selected: 4 8-bit 16 1 52 128 240 1 O-bit 64 606 51 2 960 12-bit 25
45、6 2425 2048 3840 R Ramp I +Q I 100% I YL CR 8-bit 1 28 128 128 128 128 128 1 O-bit 51 2 51 2 51 2 51 2 51 2 51 2 12-bit 2048 2048 2048 2048 2048 2048 Pattern 4 Page 13 of 15 pages RP 219-2002 k 9 h i j Pattern 4 in figure C.l OYBLK 1 ooo/ow OYoBLKh -2/0/+2 014 (a) Ideal width (1440) 309 41 1 171 69/
46、68/69 68/69 Annex C (Informative) Values for construction of color bar signal m O%BLK 206 The following are recommended values for construction of the color bar signal. a) Bar widths: a = 1920 t I Pattern 1, Pattern 2 _* Pattern 3 _* Pattern 4 _, d, 1 L Q x s O p 100% CY 100%YL - - 75% White 3 I Y-R
47、amp I 100%R Figure C.l - Reference diagram for tables C.1 and C.2 -2bl (1/12) b Il Table C.l - Bar widths for pattern 1 (see note 9) (b) Recommended width (1440) I 308 I 41 2 I 170 I 68fiOI68 I 70168 1 206 (c) Optional modified width (1448) I 31 2 41 2 170 1 68/70/68 I 70168 I 210 Note 9 - Equipment
48、 designers to be aware that suggested bar widths serve only as a guide. Due to actual rise and fall time implementations, it may be required that the bar width in pixels of f to f in table C.l and k to mo in table C.2 may be higher than theoretical value of 1440 pixels for 4x3 aspect ratio. Page 14
49、of 1 5 pages RP 219-2002 b) Pattern heights The heights of the patterns in the color bar signal are specified as integer multiples of a common factor equal to the total number of Vertical samples divided by 12. In the 1080 line HDTV system this factor is therefore 90; in the 720-line system it is 60. Heights Of patterns 1 through 4 will therefore be: 630, 90, 90, and 270 samples respectively (1080-line system) or 420, 60. 60, and 180 SampleS respectively (720-line system). Annex D (informative) Bi
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