1、INTERNATIONAL STANDARD IS0 171 21 :2000 TECHNICAL CORRIGENDUM 1 Published 2001 -04-1 5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MWYHAPOQHAFI OPTAHM3HR Il0 CTAHWTH3ALlHH ORGANISATION INTERNATIONALE DE NORMALISATION Cinematography - Work stations used for film and video production - Requirements
2、 for visual and audio conditions TECHNICAL CORRIGENDUM 1 Cinmatographie - Stations de travail utilises en production de film et vido - Prescriptions pour les condifions visuelles et audio RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to International Standard IS0 17121 :2000 was prepared by Techn
3、ical Committee ISOTTC 36, cinematography. Page 3 Replace 3.18 with the following text. 3.1 8 near point point of the position of the eye which is defined in this International Standard as the minimum viewing distance of 500 rnm to the screen of the data monitor Page 13 4.3.3 Replace the third paragr
4、aph with the following text. At quality assessment work stations with the specified peak luminance of 80 cd/m2, the screen luminance resulting from room lighting should thus be less than 0,4 cd/m2. ICs 97200.10 Ref. No. IS0 171 21 :2000/Cor.l:2001 (E) 0 IS0 2001 - All rights reserved Printed in Swit
5、zerland INTERNATIONAL STANDARD IS0 171 21 First edition 2000- 1 O- 1 5 Cinematography - Work stations used for film and video production - Requirements for visual and audio conditions Cinmatographie - Stations de travail utilises en production de film et vido - Prescriptions pour les conditions visu
6、elles et audio Reference number IS0 17121:2000(E) 0 IS0 2000 - STD-IS0 L732L-ENGL 2000 H 4853903 08489V7 529 D IS0 171 21 :2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shail not be edited unles
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9、he unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. o IS0 2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, inc
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11、ted in Switzerland 8 IS0 2000 -All rights resewed IS0 171 21 :2000(E) Contents Foreword . iv 1 2 3 4 4.1 4.1 . 1 4.1.2 4.1.3 4.1.4 4.2 4.2.1 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.3.7 4.3.8 4.4 4.5 4.5.1 4.59 4.5.3 4.5.4 4.5.5 4.5.6 4.6 5 scope 1 Normative references 1 Terms and definitions . 1 R
12、equirements . 4 Viewing distances 4 Arrangement of picture monitors . 8 Arrangement of data monitors . 10 Spatial arrangement and design 10 Viewing geometry 10 Viewing conditions 13 General 13 Luminance of the television screen . 13 Lighting of the viewing room 13 Script lighting and console lightin
13、g . 14 Colour of room . 14 Reflections 14 Screen environment 14 Vibration levels 14 Picture monitors 15 Acoustic conditions . 15 General 15 Recommended maximum permitted sound pressure level of continuous background noise . 15 Required airborne sound isolation between rooms . 16 Architectural acoust
14、ics with regard to buildings . 16 Room acoustics . 18 Sound monitors . 18 Acceptance . 20 Marking . 20 Arrangements of picture monitors and data monitors at work stations 4 Range of vision 5 O IS0 2000 . All rights reserved iii STD*ISO 17121-ENGL 2000 m 4851703 0848751 187 m IS0 171 21 :2ooo(E) Fore
15、word IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a techn
16、icai committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
17、electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requi
18、res approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. IS0 shall not be held responsible for identifying any or all sudi patent rights. International Standa
19、rd IS0 171 21 was prepared by Technical Committee 1SO/TC 36, Cinematography. iv Q is0 2000 - All rights resewed - INTERNATIONAL STANDARD IS0 171 21 :Zooo(E) Cinematography - Work stations used for film and video production - Requirements for visual and audio conditions 1 Scope This International Sta
20、ndard specifies the requirements for work stations used for electronic image and sound production in film and video facilities and broadcasting organizations. It provides assistance in achieving a consistent and critical evaluation of television and video programme material with a view to facilitati
21、ng programme exchange in commonly used review conditions. This International Standard is not applicable to work stations based on general purpose office computers or film production by traditional methods. 2 Normative references The following normative documents contain provisions which, through ref
22、erence in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of app
23、lying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International Standards. CIE 15.2:1986, Colorimetry. CIE SO05 1998, Cl sta
24、ndard illuminant for colorimet/y, EBU Specifications Techn. 321 3:1975, ?U standard of chromaticity tolerances of studio monitors. EBU Specifications Techn. 3263:1991, Specification of grade-7 colour picture monitors. EBU-Recommendation R 23: 1 987, Procedure for the operational alignment of grade-
25、7 colour picture monitors. ITU-Report 624-4/90:1990, Recommendations and Reports of the CClR - Characteristics of television systems. ITU-Recommendation 500, volume XI:l974, Recommendations and Reports of CCIR - Method for the subjective assessment of quality of television pictures. 3 Terms and defi
26、nitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 eye point term point in space where the eyes of the user of a particular item of technical equipment are positioned NOTE 1 It is dependent on the body dimensions of the user and the posture he or
27、she adopts. O IS0 2000 - All rights reserved 1 STD-IS0 L7LZL-ENGL 2000 = lI85L903 0848953 T5T IS0 171 21 :2000(E) NOTE 2 The technical equipment referred to in this case is a picture monitor or a data monitor. 3.2 viewing angle angle between the line of sight and the surface normal of the object of
28、vision 3.3 image resolution capacity of the screen to display dots or lines separately 3.4 height of picture electronic image measured vertically 3.5 picture monitor device for the reproduction and visual assessment of electronic images 3.6 binocular vision sight with both eyes 3.7 field of fixation
29、 sum total of the object points which can be fixed with the head at rest, moving only the eyes 3.8 data monitor device for displaying alphanumeric characters and graphic representations 32 electronic image television picture produced by the technical processing of film, video, text and graphics in a
30、ccordance with ITU-Report 624-4/90 3.10 detect notice that one or more optical stimuli exist 3.1 1 recognize determine what is seen through congruence being established between the object of vision and its remembered meaning 3.1 2 space of recognition space delimited by all the eye points from which
31、 all the characters displayed on a surface can be recognized with ceraint y NOTE 1 charactsrs being looked at. The extent of the space of recognition is dependent on the viewing distance, the viewing angle and the size of the NOTE 2 A data monitor is an example of the type of surface referred to in
32、this definition. 3.13 fixation look directing the eyes at a point I 2 Q IS0 2000 - All rights reserved STD-IS0 17121-ENGL 2000 4851903 0848754 77b m IS0 17121:2000(E) 1 NOTE 1 in the middle of the fovea. A normal-sighted eye assumed, the adjustment takes place in such a way that an image of the fixe
33、d point is formed NOTE 2 Fixation is the prerequisite for the recognition of objects of vision. 3.14 surface normal perpendicular onto the surface of the display (here, the screen) 3.1 5 control desk operating console or work table with work equipment, for example keys, controls or measuring equipme
34、nt, for controlling and processing of picture and/or sound 3.16 monitor wall several picture monitors arranged next to each other vertically andor horizontally 3.17 monocular vision sight with one eye 3.18 near point point to which the eye is adjusted at the highest dioptric power of its optical sys
35、tem 3.19 viewing distance distance between the eye and the object of vision NOTE Unless indicated otherwise, the viewing distance is based on the centre of the screen. 3.20 line of sight straight line between the centrally-imaged object point and its image point NOTE This line goes approximately thr
36、ough the two nodal points of the eye. 3.21 field of vision field of fixation and visual field 3.22 object of vision object in external space, the image of which on the retina leads to a perception NOTE Objects of vision are electronic images on picture monitors and characters on data monitors. 3.23
37、visual angle angle whose vertex is at the eye and whose angle sides encompass the object of vision See Figure 2. NOTE Unless indicated otherwise, the visual angle is based on the height of the object of vision. 3.24 peak luminance luminance adjusted on a monitor that corresponds to the white level o
38、f the picture signal Q IS0 2000 - All rights reserved 3 STD-IS0 17121-ENGL 2000 4851703 08q8755 822 IS0 171 21 :2000( E) Viewing distancea from 4 hB to 6-hB from 6 hB to 9.hg 3.25 sound monitors device (loudspeaker) for reproducing sound signals Task requirements suitable for quality assessment and
39、for reliably correcting details of pictures suitable for assessing and checking whole pictures 3.26 extended field of fixation space delimited by sum total of all object points that can be fixed with the body at rest, only moving the head and eyes from 14 hB to 20.hB 4 Requirements unsuitable for as
40、sessment; however, the picture content is still clearly recognizable for checking purposes 4.1 Arrangements of picture monitors and data monitors at work stations 4.1.1 Viewing distances 4.1.1.1 General When specifying viewing distances, determine the nature of the task in hand; for example, disting
41、uish between assessing television images on picture monitors and reading text on data monitors. The specifications assume viewers to have normal sight, in particular for colour television. Defective vision shall be corrected by aids to vision such as spectacles. 4.1.1.2 Viewing distances for picture
42、 monitors This International Standard is based on television images in accordance with ITU) (previously CCIR)-Report 624- 4/90. The viewing distance for picture monitors is specified as a multiple of the visible height of the picture h, (millimetres) (see ITU Recommendation 500, volume X1, 1974). Th
43、e viewing distance as shown in Table 1 may vary depending on the nature of the task. r from 9 hg to 144, I suitable for rough assessments I 1 ) international Telecommunication Union. 4 O IS0 2000 - Ail rights reserved STD=ISO L712L-ENGL ZOO0 9851703 089895b 7b7 W IS0 171 21 :2000( E) 4.1.1.3 Viewing
44、 distances for data monitors The viewing distance for data monitors shall be selected so that individual characters and symbols on the screen are recognized from the position of the eye point. This is assured when the height of the character without ascenders or descenders, for example capital lette
45、rs, appears at a viewing distance of 500 mm from a visual angle of at least 20 angular minutes (see Figures 1 and 2). Viewing distances of less than 200 mm shall be avoided because this is less than the position of the near point. For a viewing distance of 500 mm, the character height shall be at le
46、ast 2,9 mm. For viewing distances of more than 500 mm, a visual angle of 20 angular minutes is indicated if the height of the character corresponds to the actual viewing distance, divided by 170. Figwe 1 -Vi diaancc i, and viewing angle , displayed in the centre of the screen Figure 2 - Viewing angl
47、e 4.1.2 Range of vision 4.1.2.1 General The characteristics of the range of vision (lines of sight, fields of vision) and the sitting posture, based largely on the work station, are the key factors for the arrangement of picture monitors and data monitors. The figures indicated (dimensions and angle
48、s) represent general ergonomic basic principles for the anthropometric design of work stations. O IS0 2000 -All rights reserved 5 STD*ISO 1712L-ENGL 2000 = 985L703 0898757 bT5 IS0 171 21 :2qE) 4.1.2.2 Lines of sight The course of the lines of sight forms the reference for the object of vision (for e
49、xample television images, characters on data monitors, keys on the control desk) and, in conjunction with the fields of vision, is important for the arrangement of the work equipment. In order to achieve optimum, that is large, visual angles, the lines of sight of the eye should correspond to the surface normal. When the lines of sight are horizontal, the head is held up and the eyes are looking straight ahead; the line of sight is thus identical to the horizontal see Figure sa). With a head-related line of sight, the head is held in a relaxed position (
