1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 24502:2010Ergonomics Accessibledesign Specification of age-related luminance contrast forcoloured light (ISO 24502:2010)BS EN ISO 24502:2010 BRITISH STANDARDNational fo
2、rewordThis British Standard is the UK implementation of EN ISO24502:2010.The UK participation in its preparation was entrusted to TechnicalCommittee PH/9/1, Ergonomics of the physical environment.A list of organizations represented on this committee can beobtained on request to its secretary.This pu
3、blication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 68947 5ICS 11.180.30; 13.180Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published un
4、der the authority of theStandards Policy and Strategy Committee on 31 January 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 24502 December 2010 ICS 11.180.30; 13.180 English Version Ergonomics - Accessible design - Specification of
5、 age-related luminance contrast for coloured light (ISO 24502:2010) Ergonomie - Conception accessible - Spcification du contraste de luminance li lge pour la lumire colore (ISO 24502:2010) Ergonomie - Zugngliche Gestaltung - Leitlinien fr die Spezifikation des altersbezogenen Leuchtdichte-Kontrastes
6、 fr farbiges Licht (ISO 24502:2010) This European Standard was approved by CEN on 14 December 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-
7、to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by transl
8、ation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland
9、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMI
10、TEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 24502:2010: EBS EN ISO 24502:2010EN ISO 24502:2010 (E) 3 Foreword This document (EN ISO 24502:2010) has be
11、en prepared by Technical Committee ISO/TC 159 “Ergonomics” in collaboration with Technical Committee CEN/TC 122 “Ergonomics” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,
12、 at the latest by June 2011, and conflicting national standards shall be withdrawn at the latest by June 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or
13、 all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
14、Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 24502:2010 has been approved by CEN as a EN ISO 24502:2010 without any mod
15、ification. BS EN ISO 24502:2010ISO 24502:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Age-related luminance contrast.3 5 Using age-related luminance contrast 6 Annex A (informative) An example of calcul
16、ation and application of age-related luminance contrast.7 Bibliography10 BS EN ISO 24502:2010ISO 24502:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prep
17、aring International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in
18、liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task
19、of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention
20、is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 24502 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 5, Ergonomics of the phys
21、ical environment. BS EN ISO 24502:2010ISO 24502:2010(E) ISO 2010 All rights reserved vIntroduction Although the proportion of older people is increasing in many countries, the care for better visibility of signs and displays is not sufficiently taken for those older people. This prevents older peopl
22、e from actively being involved in social activities, as well as from living their life safely and comfortably. This International Standard provides a method of calculating age-related luminance contrast that can be used for assessing and designing signs and displays in our visual environment, so tha
23、t they are clearly visible to older people. This method calculates age-related luminance contrast for people aged from 10 to 79 years based on age-related photopic spectral luminous efficiency of the eye. This International Standard adopts the principles of accessible design given in ISO/IEC Guide 7
24、1 and amplified in ISO/TR 22411. BS EN ISO 24502:2010BS EN ISO 24502:2010INTERNATIONAL STANDARD ISO 24502:2010(E) ISO 2010 All rights reserved 1Ergonomics Accessible design Specification of age-related luminance contrast for coloured light 1 Scope This International Standard specifies the age-relate
25、d luminance contrast of any two lights of different colour seen by a person at any age, by taking into account the age-related change of spectral luminous efficiency of the eye. This International Standard provides a basic method of calculation that can be applied to the design of lighting, visual s
26、igns and displays. It applies to light, self-luminous or reflected, in visual signs and displays seen under moderately bright conditions called photopic vision and whose spectral radiance is known or measurable. It does not apply to light seen under darker conditions called mesopic or scotopic visio
27、n. This International Standard specifies the luminance contrast for people aged from 10 to 79 years who have had no medical treatment or surgery on their eyes that may affect their spectral luminous efficiency. This International Standard does not apply to visual signs and displays seen by people wi
28、th colour defects whose spectral luminous efficiency is different from those with normal colour vision, nor those seen by people with low vision. 2 Normative references The following refererenced documents are indispensable for the application of this document. For dated references, only the edition
29、 cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3864-1:1), Graphical symbols Safety colours and safety signs Part 1: Design principles for safety signs and safety markings ISO 3864-4:2), Graphical symbols Safety colours an
30、d safety signs Part 4: Colorimetric and photometric properties of safety sign materials ISO 9241-302:2008, Ergonomics of human-system interaction Part 302: Terminology for electronic visual displays ISO 9241-303:2008, Ergonomics of human-system interaction Part 303: Requirements for electronic visua
31、l displays ISO 23539/CIE S 010, Photometry The CIE system of physical photometry CIE 15, Colorimetry CIE 17.4-1987, International lighting vocabulary 1) To be published. (Revision of ISO 3864-1:2002) 2) To be published. BS EN ISO 24502:2010ISO 24502:2010(E) 2 ISO 2010 All rights reserved3 Terms and
32、definitions 3.1 luminous efficiency ratio of radiant flux weighted according to V() to the corresponding radiant flux CIE 17.4-1987 3.2 spectral luminous efficiency of a monochromatic radiation of wavelength (V() for photopic vision; V() for scotopic vision ratio of the radiant flux at wavelength mt
33、o that at wavelength , such that both radiations produce equally intense luminous sensations under specified photometric conditions and mis chosen so that the maximum value of this ratio is equal to 1 NOTE 1 Adapted from CIE 17.4-1987. NOTE 2 The values for spectral luminous efficiency in photopic v
34、ision are given in ISO 23539/CIE S 010. 3.3 radiant flux power emitted, transformed or received in the form of radiation NOTE The radiant flux is expressed in watts (W). CIE 17.4-1987 3.4 age-related photopic spectral luminous efficiency Va() spectral luminous efficiency defined as a function of age
35、, a 3.5 luminance contrast ratio between the higher luminance, LH, and lower luminance, LL, that defines the feature to be detected NOTE 1 If measured by contrast modulation (or Michelson contrast) it is defined as: HLmHLL LCL L=+(1) or, if measured by contrast ratio (CR), it is defined as: HLCRLL=
36、(2) NOTE 2 Contrast ratio, CR, is often used for high luminances. When near the luminance-detection threshold, some use the following form (also known as Weber contrast): HLwLL LCL= (3) NOTE 3 For some but not all displays, area-luminance targets can be used to approximate the luminances that define
37、 the feature to be detected because pixels are discrete and near-area luminance is sufficiently uniform. ISO 9241-302:2008 NOTE 4 Equation (2) is used in this International Standard. Equations (1) and (3) may also be used to calculate age-related luminance contrast. BS EN ISO 24502:2010ISO 24502:201
38、0(E) ISO 2010 All rights reserved 33.6 age-related luminance contrast Ca() luminance contrast defined as a function of age, a NOTE The formula is given in Equation (4). 3.7 photopic vision vision by the normal eye when it is adapted to levels of luminance of at least several candelas per square metr
39、e CIE 17.4-1987 3.8 CIE standard photometric observer ideal observer having a relative spectral responsivity curve that conforms to the V() function for photopic vision or to the V() function for scotopic vision, and that complies with the summation law implied in the definition of luminous flux CIE
40、 17.4-1987 4 Age-related luminance contrast The equation for age-related luminance contrast, Ca, is derived from the luminance contrast equation in which the luminance term is accommodated to the value that takes into account the age-related change of spectral luminous efficiency. See Table 1. Equat
41、ion (4) shall be applied when age-related luminance contrast is calculated for light P1and light P2with spectral radiance of Le,1and Le,2, respectively. 780,1380780,2380()()eaaeaLVCLV =(4) for 780 780,1 ,2380 380() ()ea e aLV L V where Cais the age-related luminance contrast for age, a; Le,1is the s
42、pectral radiance of light P1, expressed in Wm2sr1nm1; Le,2is the spectral radiance of light P2, expressed in Wm2sr1nm1; Va() is the age-related photopic spectral luminous efficiency of age, a, in years (values given in Table 1 in decade steps); is the wavelength width (5 nm). NOTE 1 Age, a, is expre
43、ssed in years but specified in decade steps such as 10-19 or 20-29 years, as indicated in Table 1. For example, C20and V20() mean the age-related luminance contrast and age-related photopic spectral luminous efficiency function, respectively, averaged for people in their twenties. NOTE 2 Le,1and Le,
44、2, as well as Va(), are tabulated in the range of 380 nm to 780 nm in 5 nm steps as shown in Table 1. in Equation (4) is therefore 5 nm. For more accurate calculation, the 1 nm width is applied by using interpolation. There are a few methods for interpolation recommended by the CIE depending on the
45、spectral composition (see CIE 15). BS EN ISO 24502:2010ISO 24502:2010(E) 4 ISO 2010 All rights reservedNOTE 3 The quantity is analogous to the luminance defined by the CIE, in which the standard luminous efficiency, V(), and the maximum luminous efficacy, Km(683 lm/W), are used. 780,1380()eaLV NOTE
46、4 In the definition of luminance by the CIE, the continuous integral equation is used to avoid the effect of the wavelength width. In practice, summation of spectral radiance weighted by spectral luminous efficiency in 5 nm steps is adequate. NOTE 5 Equation (4) is derived from one of the definition
47、s for luminance contrast using 780,1380()eaLV as a luminance component. Other definitions such as Michelson contrast (ISO 9241-302) may also be applied for the calculation of age-related luminance contrast. NOTE 6 Age-related change in Va() and its implication to the visual efficiency of light are d
48、escribed in ISO/TR 22411. Table 1 Age-related photopic spectral luminous efficiency Photopic luminous efficiency Wavelength nm 10-19 years 20-29 years 30-39 years 40-49 years 50-59 years 60-69 years 70-79 years 380 0,002 723 0,001 567 0,000 861 0 0,000 493 2 0,000 275 4 0,000 154 9 0,000 088 10385 0
49、,004 295 0,002 523 0,001 435 0,000 843 3 0,000 485 3 0,000 281 8 0,000 164 4 390 0,006 730 0,004 055 0,002 382 0,001 439 0,000 859 0 0,000 512 9 0,000 306 9 395 0,010 12 0,006 237 0,003 784 0,002 371 0,001 455 0,000 891 3 0,000 547 0 400 0,015 12 0,009 546 0,006 026 0,003 804 0,002 401 0,001 516 0,000 956 9 405 0,021 59 0,014 00 0,009 076 0,005 885 0,003 816 0,002 474 0,001 604 410 0,029 43 0,019 59 0,013 03 0,008 67
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