1、 BSI BS*EN*bLbLO 76 1624667 0554770 4Lb Prints and transparencies produced from electronic sources - Assessment of image quality BS EN 61610 : 1996 IEC 1610 : 1995 The European standard EN 61610 : 1996 has the status of a British Standard ICs 35.240.20; 37.100 NO COPYING WITHOUT BSI PERMISSION EXCEP
2、T AS PERMITTED BY COPYRIGHT LAW ES1 BS*EN*hLhLO 46 U Lb24bb 0554773 352 BS EN 61610 : 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPUl, Audio, video and multimedia systems and equipment, to Subcommittee EPL4/3, E
3、quipment and systems in the field of audio, video and audiovisual engineering, upon which the following bodies were represented: Association of British Theatre Technicians Audio Engineering Society British Broadcasting Corporation British Educational Suppliers Association British Radio and Electroni
4、c Equipment Manufactureis Association British Telecommunications plc Federation of British Audio Federation of the Electronics Industry Independent Television Association (l”i?A) Inshtute of Sound and Communication Engineers Institution of Electrical Engineers International Association of Broadcasti
5、ng Manufacturers Professional Lighting and Sound Association Royal Institute of British Architects Society of Cable Television Engineers This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and
6、comes into effect on 15 August 1996 o BSI 1996 Amendments issued since publication Amd*No* I Text The following BSI references relate to the work on this standard: Committee reference EPU1003 Draft for comment 93/205914 DC ISBN O 580 26120 4 I I BSI BS*EM*bLbLO 96 = 1624669 0554772 299 BS EN 61610 :
7、 1996 Contents Committees responsible page Inside front cover National foreword ii Foreword 2 Text of EN 61610 3 O BSI 1996 i BSI BS*EN*bLbLO 96 1624669 0554773 125 BS EN 61610 : 1996 National foreword This British Standard has been prepared by Subcommittee EPUlB and is the English language version
8、of EN 61610 : 1996 Prints and transparencies producedjbm electronic sources -Assessment of image quality, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 1610 : 1995, published by the International Electrotechnical Commission (IEC). Cross-
9、references Publication referred to Corresponding British Standard BS 1384 Photographic density measurements Part 1 : 1986 Guide for terms, synzbois and notations Past 2 : 1993 Specification for geometric conditions for tmmssion density BS Is0 5 Photography. Density measurements BS Is0 53 : 1995 Spec
10、tral conditions BS IS0 5-4 : 1995 Geometric conditions for mflction density IS0 51 : 1984 Is0 5-2 : 1991 Is0 53 : 1984 IS0 5-4 : 1983 Compliance with a British Standard does not of itself confer immunity from legal obligations. ii O BSI 1996 BSI BS*EN*bLbLO b Lb24669 0554774 Ob1 EUROPEAN SrANDAFD EN
11、 61610 NO= EUR0PEE”E EuROP(u dA ;(A), ;(A) and ;(A) are the functions specified as the CIE 1931 standard colorimetric observer for a view angle of 2” (see ISO/CIE 10527). 4.3.3 Relation between input values and tristimulus values When the input signal is a standard analogue or digital video signal,
12、the appropriate colorimetric specification should be used to transform corresponding tristimulus values. The conversions from R, G, B to the tristimulus values shall be made by the following equations according to the video standard used. BSI BS*EN*bLbLO 9b Lb24669 0554780 3b5 Page 7 EN 61610 : 1996
13、 For standard NTSC system with standard illuminant C X = 0,60674 R + 0,17353 G + 0,20025 B Y = 0,29884 R + 0,58673 G + 0,11443 B 2 = O,OOoOo R + 0,0661 1 G + 1,11566 B For standard PAUSECAM systems with standard illuminant D, X= 0,43066 R + 0,34155 G + 0,17819 B Y = 0,22206 R + 0,70666 G + 0,07 128
14、B 2 = 0,02019 R + 0,12956 G + 0,93848 B For any standard HDTV system The equations should be decided in accordance with the chromaticity coordinate values for the input primary colours, and for the reference white, in accordance with the method described in 2. 5 Methods of measurements 5.1 Gamut of
15、colours 5.1.1 Characteristics to be determined The maximum reproducible colour range m tem of the psychometric lightness and chromaticity. 5.1.2 Measurement procedure a) The test signals containing input saturated colours shall be generated as specified by this standard.The signals shail correspond
16、to the colours white, yellow, cyan, green, magenta, red, blue, and black as prints and transparencies. The level of each input signal shall be in accordance with table 1. BSI BS*EN*bLbLO b Lb24bb 0554783 2TL Page 8 EN 61610 : 1996 Colours i White 2 Yellow 4 Green 6 Red 7 Blue 8 Black 3cyan , 5 Magen
17、ta Table 1 - Input signal specification input signais 9 R G B 1 O0 1 O0 1 O0 1 O0 1 O0 O O 1 O0 I O0 O 1 O0 O 1 O0 O 100 1 O0 O O O O 1 O0 O O O If the equipment accepts standard video signals, the standard colour bar generator to produce colour bars (a) 100/0/100/0 (see “U-R Recommendation BT 471-1
18、) may be used. b) The spectral density d(A), or spectral reflectance or spectral transmittance p(rl), for object colours of the prints or illuminant colours of transparencies, corresponding to the test signals, shall be measured for wavelengths from 400 nm to 700 nm in 10 nm steps. If spectrai densi
19、ty is adopted for the measurement, it shall be converted to spectral reflectance or transmittance by the following formula: c) The tristimulus values, X, Y, 2 shall be calculated for each colour (see 4.3.2). 5.1.3 Presentation of results The measured spectral characteristics for the eight colours, i
20、ncluding white and black, shall be plotted as the curves (see figure 1). The calculated tristimulus values shall be converted to values in the CIE 1976 colour space, Lab as defined in CIE 15.2 for eight colours. They shall be reported as a table (see table 2), together with the kind of the standard
21、illuminant used for calculation. The results shall also be presented as graphs, as shown in figure 2. L - 116,O 1-16,O D - soo ,Op-Y 3 b* - 200,O(Y-Z) ES1 BS*EN*bLbLO b m 1624669 0554782 134 m Page 9 EN 61610 : 1996 where x X Xn xn Y Y Yn Yn XI= (-) fm - 2 0,008856 y - (-1 for - 2 0,008856 z z Zn Zn
22、 z (-) fW - 2 0,008856 and X 16,O X X - 1,181 - + - fW - I 0,008856 Xn 116,O Xn Y 16,O Y Y- 7,181 - t - fm - s 0,008856 I, 116,O Yn Z 16,O Z Z - 1,781 - + - f - i 0,008856 Z, 116,O Zn and where X, Y, 2, are the tristimulus values for the illuminant of the colorimetric system adopted for the input si
23、gnal. For the NTSC system: X, = 0,98054 Y, 1,00000 Z,= 1,18181 For the PAUSECAM system: x, = 0,95041 Y, = 1,ooooo Z, = 1,08825 For the systems other than tie above, tzdng into account the specific illuminant, ,$(A): Yn - 1,00000 ES1 BS*EN*61610 76 D 3624667 0554783 074 D b Colours white Yellow Green
24、 Magenta Red Blue Black cyan Page 10 EN 61610 : 1996 a* 1 b 0.8 0.2 O 400 450 500 550 600 Wavelength (mm) 650 700 Figure 1 - Spectral characteristics of saturate colours Table 2 - Tabular report for gamut of colours L I Standard illuminant: I BSI BS*EN*bLbLD b Lb2Ybb9 0554784 TOO Page 11 EN 61610 :
25、1996 100 50 -50 -100 100 80 60 L 40 20 O -100 -50 O 50 100 U+ Figure 2a - Gamut of colours expressed in (a*$? plane I I o OY oc GO - 100 -50 O 50 100 a* Figure 2b - Gamut of colours expressed in (a*,L*) plane BSI BSmENmbLbLO 96 m Lb24bb9 0554785 947 m Page 12 EN 61610 : 1996 80 60 L* 40 20 O -100 -5
26、0 O 50 100 b* Figure c - Gamut of colours expressed in (b*,L? plane Figure 2 - Gamut of colours 5.2 Reproduced colours 5.2.1 Characteristics to be determined Coordinate points m CIE 1976 L*u*b* colour space (defined in CIE 15.2) of unsaturated primary colours, yellow, magenta and cyan, and unsaturat
27、ed secondary colours, red, green and blue, and white, when the specified input signals are applied to the equipment which produces prints or transparencies. 5.2.2 Measurement procedure a) The test signals containing colorimetric information, X, Y, Z, in tristimulus values specified in this standard
28、shall be generated to produce prints and transparencies. The specifications of the tristimulus values are stated in annex A. If the equipment accepts a composite colour video signal, the corresponding signal may be generated by the standard 100/0/100/0 colour bar generator to generate test pattern (
29、a) of ITU-R Recommendation BT 47 1 - 1 with the chrominance signal level attenuated by one-half in amplitude, and with the luminance signal level unchanged. If the equipment accepts component video, the R, G, B test signal shall be in accordance with the table in annex A. BSI BS*EN*h1610 96 W Lb2466
30、9 0554786 883 m Page 13 EN 61610 : 1996 b) The prints and transparencies corresponding to the test signals shall be measured to obtain the tristimulus values, X, Y, Z, for illuminant colours and for object colours, respectively (see 4.3.1 and 4.3.2). c) The tristimulus values of the reproduced colou
31、rs, X, Y, Z, shall be converted to the CIE 1976 colour space, Lab (see 5.1.3). 5.2.3 Presentation of results The calculated Lab shall be reported together with the standard illuminant used in calculation, as in table 3. The coordinate points in the two-dimensional chromaticity scales shall also be r
32、eported as shown in figure 3. Table 3 - Tabular report for reproduced colours 80 60 40 20 b o -20 40 -60 -80 -80 -60 -40 -20 O 20 40 60 80 U Figure 3a - Reproduced colours in (a*,b*) plane BSI BS*EN*61610 96 m Lb24669 0554787 7LT m 100 80 60- 40 20 O Page 14 EN 61610 : 1996 I 1 1 I I I OYO w OC - oG
33、 - - OM O R - OB - - - I I I I I I L Figure 3b - Reproduced colours in (a*,L? plane L Figure 3c - Reproduced colours in (bo(A) and A(a) are the functions to characterize the standard deviate observer, and K- s(i)y(a)da Li8 2) The colour shift AL*, Au*, Ab* from the original reproduced colour shall b
34、e determined in the CIE 1976 colour space L a b for each colour. * 5.3.3 Presentation of results The degree of colour shift under changes in iiiuminants and in observer shall be reported together with the standard illuminant in a table such as table 4. Table 4 - Colour shift report I Standard illumi
35、nant: I Colour shift caused by the change in observer A Le= ;Aa*= ; Ab= ; ArIb= . 5.4 Grey balance 5.4.1 Characteristics to be determined The degree of achromatic balance when achromatic input signals are reproduced as prints or transparencies. 5.4.2 Measurement procedure a) The achromatic signal sh
36、all be generated following what the manufacturer specifies for the equipment. b) The achromatic signal shall include grey levels from O % to 10 % of the input full-scale ranges in 20 % steps inclusively. NOTE - nie achromatic signai levels are calculated by the equations shown in 4.3.3 when they are
37、 of the standard video signals, or in accordance with 4.3.2 when they are arbitrarily defined. c) The images shall be measured for their spectral transmittance of transparencies or spectral reflectance of prints. d) The tristimulus values corresponding to each grey level shall be calculated and conv
38、erted to coordinate values in the CIE 1976 colour space L*a*b (see 5.1.3). BSI BS*EN*blbLO 96 W II624667 0554770 204 Page 17 EN 61610 : 1996 25*1Ili IlII 20 - 15 - 10 - 5- -5 - -10 - -15 - -20 - -25. I I - - - - b0 - - - - IlII 5.4.3 Presentation of results The degree of achromatic balance shall be
39、reported as plots on the (u*, b) coordinates and as plots on the (C*,L*) coordinates, where C* is defined as: Oo 80 a“ L O O O 5 10 15 20 25 C.=JW Figure 4 - Presentation of grey balance 5.5 Grey scale reproduction (tone reproduction) 5.5.1 Characteristics to be determined The linearity of the psych
40、ometric lightness when achromatic input signals of various levels are reproduced. 5.5.2 Measurement procedure a) The achromatic signal shall be generated following what the manufacturer specifies for the equipment. b) The achromatic signai shall be composed of grey levels from O % to 100 % of the in
41、put full-scale ranges in 10 % steps, inclusively. NOTE - The achromatic signal levels are calculated by the equations shown in 4.3.3 when they are of the standard video signals, or in accordance with 4.3.2 when they are arbitrarily defined. c) The reproduced images shall be measured by their reflect
42、ance optical densities D (s, : for prints, or transmittance optical densities D, (sH : v,) for transparencies, for each step i. For the notations, see IS0 5-1. The measuring instrument shall have a spectral product, II, response, equal to the spectral product of the CIE standard luminous efficiency
43、function, V(A) (see ISO/CIE 10257) and the spectrum of the CIE standard illuminant A (see ISO/CIE 10256). BSI BSrENxblblO 96 1b24bb 0554791 140 = Page 18 EN 61610 : 1996 NOTE - One of the tristimulus values D,=(O,l) and D-(O,l) are the maximum and the minimum optical densities at spatial frequency s
44、 = O, i mm-, respectively. NOTE - To avoid aiiasing. the aperture width w should be given by ws (2f-)- wheref- is the highest spatial frequency to be measured as determined in step b). 5.7.3 Presentation of results The measured results, v(s), for each spatial frequency shall be reported as curves ex
45、emplified in figure 7. The aperture size of the micro densitometer shall be reported in millimetres. BSI BS*EN*b1610 96 = I1624669 0554794 95T Page 21 EN 61610 : 1996 NOTE - The spatial frequency range may be changed so as to cover the spatial frequency for v(s) = 0.3. Figure 7 - Spatial frequency r
46、esponse resolution 5.8 Image stability under exposure to light (light fastness) 5.8.1 Characteristics to be determined The image stability when the prints or transparencies are exposed to normal room lighting conditions. 5.8.2 Measurement procedure a) Produce a sample of print or transparency of the
47、 specified image. The specification of the image is shown in figure 8. The corresponding input signal is specified in table 6. NOTE -The numbers correspond to the colours in table 6. Figure 8 - Profile of printed image BSI BS*EN*6161O 76 1624667 0554775 896 M R Page 22 EN 61610 : 1996 G B Table 6 -
48、Input signal specification for image stability Input signais I coiours I 5% 1 White 2 Yellow 4 Green 5 Magenta 6 Red 7 Blue 8 Black 3 cyan 100 100 50 50 100 100 50 50 100 100 100 100 50 50 50 50 100 50 100 50 100 50 100 50 b) The print or transparency shail be cut across the bars into two similar pi
49、eces. One of the pieces shall be used for the test, and the other shd be kept in a dark environment at a temperature less than 300 K and at a relative humidity of 50 (+10/0) % as a control piece. c) The test piece shall be placed underneath a sodium glass plate of thickness 6 mm and shall be kept for 7 days exposure to a xenon lamp giving an irradiance of 0,22 W/m2 at a wavelength of 340 nm with an ambient temperature of between 300 K and 310 K and a relative humidity
