BS ISO 6198-1994 en_4604 Micrographics - Readers for transparent microforms - Performance characteristics《缩微摄影技术.透明缩微胶片阅读器.性能特征》.pdf

《BS ISO 6198-1994 en_4604 Micrographics - Readers for transparent microforms - Performance characteristics《缩微摄影技术.透明缩微胶片阅读器.性能特征》.pdf》由会员分享，可在线阅读，更多相关《BS ISO 6198-1994 en_4604 Micrographics - Readers for transparent microforms - Performance characteristics《缩微摄影技术.透明缩微胶片阅读器.性能特征》.pdf（16页珍藏版）》请在麦多课文档分享上搜索。

1、BRITISH STANDARD BS ISO 6198:1993 Implementation of ISO 6198:1993 Micrographics Readers for transparent microforms Performance characteristics UDC 778.148BSISO 6198:1993 This British Standard, having been prepared under the directionof the Information andDocumentation StandardsPolicy Committee, wasp

2、ublishedunder the authorityofthe Standards Boardand comes into effect on 15February1994 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference DOT/16 Draft for comment 91/69219 DC ISBN 0 580 22983 1 Committees responsible for this British Standard The prepa

3、ration of this British Standard was entrusted by the Information and Documentation Standards Policy Committee (DOT/-) to Technical Committee DOT/16, upon which the following bodies were represented: British Computer Society British Library British Office Technology Manufacturers Alliance British Pho

4、tographic Association Cranfield Imaging and Document Management User Group Her Majestys Stationery Office Kodak Limited Library Association London Borough of Bromley National Centre for Information Media and Technology (Cimtech) Ordnance Survey United Kingdom Association for Information and Image Ma

5、nagement The following body was also presented in the drafting of the standard, through subcommittees and panels: Association of Photographic Technicians Amendments issued since publication Amd. No. Date CommentsBSISO 6198:1993 BSI 11-1999 i Contents Page Committees responsible Inside front cover Na

6、tional foreword ii Foreword iii Text of ISO 6198 1BSISO 6198:1993 ii BSI 11-1999 National foreword This British Standard reproduces verbatim ISO6198:1993 and implements it as the UK national standard. This British Standard is published under the direction of the Information and Documentation Standar

7、ds Policy Committee whose Technical Committee DOT/16 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and Europea

8、n developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, Publications, BSI, Linford Wood, Milton Keynes, MK14 6LE. A British Standard does not purport to include all the necessary provisions of a cont

9、ract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO title page, pagesii toiv,

10、pages1 to6, an inside back cover and abackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO 6198:1993(E) ii BSI 11-1999 Contents Page Foreword iii 1 Scope 1 2 Normative refe

11、rences 1 3 Definitions 1 4 Measurable characteristics 1 5 Additional required characteristics 4 6 Optional characteristics 6 Annex A (informative) Screen illuminance Field method for measuring Inside back cover Figure 1 Measurement area of reader screen 3 Table 1 Minimum sized ISO microtest chart No

12、. 1 characters to be resolved in the screen image (values based upon prepared microtest chart) 2 Table 2 Minimum sized ISO microtest chart No. 2 pattern to be resolved in the screen image (values based upon specifically made microtest charts which may require calculations to give true values) 2 Tabl

13、e 3 Temperature of different parts of the reader 4 Descriptors: Micrographics, micrographic equipment, microform readers, specifications, performance evaluation.ISO 6198:1993(E) BSI 11-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national st

14、andards bodies (ISO member bodies). The work of preparing 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 o

15、rganizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees ar

16、e circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO6198 was prepared by Technical Committee ISO/TC171, Micrographics and optical memories for document and image recordi

17、ng, storage and use. Annex A of this International Standard is for information only.iv blankISO 6198:1993(E) BSI 11-1999 1 1 Scope This International Standard specifies the essential performance characteristics of readers with magnification less than or equal to 50 : 1 designed for use with black-an

18、d-white roll microfilm and strips that have a maximum width of35mm. It also specifies the performance of readers for microfilm, microfiche, jackets containing microforms, and image cards. It is not applicable to reader-printers or to devices such as pocket readers. 2 Normative references The followi

19、ng standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour

20、aged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 446:1991, Micrographics ISO character and ISO test chart No. 1 Description and use. ISO 3272-3:1975, Mi

21、crocopying of technical drawings and other drawing office documents Part 3: Unitized 35 mm microfilm carriers. ISO 3334:1989, Micrographics ISO resolution test chart No. 2 Description and use. ISO 6196-1:1993, Micrographics Vocabulary Part 01: General terms. ISO 6196-2:1993, Micrographics Vocabulary

22、 Part 02: Image positions and methods of recording. ISO 6196-3:1983, Micrographics Vocabulary Part 03: Film processing. ISO 6196-4:1987, Micrographics Vocabulary Part 04: Materials and packaging. ISO 6196-5:1987, Micrographics Vocabulary Part 05: Quality of images, legibility, inspection. ISO 6196-6

23、:1992, Micrographics Vocabulary Part 06: Equipment. ISO 6199:1991, Micrographics Microfilming of documents on 16 mm and 35 mm silver-gelatin type microfilm Operating procedures. ISO 7565:1993, Micrographics Readers for transparent microforms Measurement of characteristics. ISO 7779:1988, Acoustics M

24、easurement of airborne noise emitted by computer and business equipment. ISO 9878:1990, Micrographics Graphical symbols for use in microfilming. ISO 9923:, Micrographics Transparent A6 microfiche image arrangements 1) . IEC 417:1987, Graphical symbols for use on equipment. Index, survey and compilat

25、ion of the single sheets Eighth supplement. IEC 950:1991, Safety of information technology equipment, including electrical business equipment. 3 Definitions For the purposes of this International Standard, the definitions given in ISO6196 apply. 4 Measurable characteristics To comply with this Inter

26、national Standard, a reader shall conform to the following requirements. 4.1 Magnification Measure the magnification in accordance with ISO7565. The actual magnification shall be within 5% of the manufacturers stated magnification. 4.2 Image quality 4.2.1 Resolution When the image of the microtest c

27、hart is positioned on the screen and with the reader at best focus 2) , the minimum sized characters or test patterns as shown inTable 1 orTable 2 for the specified magnification shall be resolved at all points within the measurement area of the screen (seeFigure 1). The resolution test is made with

28、 either of the two microtest charts (ISO No.1 or ISO No.2). The test image used shall be capable of resolving at least four patterns higher than specified inTable 2 for the appropriate magnification. For readers having a magnification between the values listed inTable 1 orTable 2, the character or p

29、attern to be resolved shall be that of the closest to the listed nominal magnification. The methods of reading the character or pattern resolved are described in ISO446 and ISO3334. 1) To be published. 2) The best focus is the setting of the focusing control which is judged to produce the best overa

30、ll level of screen image resolution within the measurement area. This setting is found experimentally and will usually be somewhere between the setting which produces the highest resolution at the centre of the screen and the settings which produce the highest resolution at the corners.ISO 6198:1993

31、(E) 2 BSI 11-1999 4.2.2 Geometric distortion When the image of a straight line is projected onto any part of the measurement area (seeFigure 1) of a flat reader screen, the projected image shall be compared to a straightedge held next to the projected line. When measured in accordance with ISO7565,

32、the pincushion or barrel distortion shall not exceed0,5% and the keystone or skew distortion shall not exceed2%. Less distortion may be required for technical drawing applications, whereas more distortion may be allowable for some office applications. Under these circumstances, the allowable distort

33、ion shall be agreed between manufacturer and purchaser. Table 1 Minimum sized ISO microtest chart No. 1 characters to be resolved in the screen image (values based upon prepared microtest chart) Table 2 Minimum sized ISO microtest chart No. 2 pattern to be resolved in the screen image (values based

34、upon specifically made microtest charts which may require calculations togive true values) 4.3 Screen luminance and contrast 4.3.1 Screen luminance 4.3.1.1 Procedure Measure screen luminance in accordance with ISO7565. The procedure outlined gives values of luminance that would be seen by a user whe

35、n in the normal viewing position (see ISO7565, Annex A). 4.3.1.2 Requirements At any point within the measurement area of the screen (seeFigure 1), the luminance shall not be less than 35cd/m 2 . The minimum luminance at the centre of the screen shall not be less than140cd/m 2 . 4.3.1.2.1 Rear proje

36、ction readers The relationship in luminance between the maximum value and the minimum value shall not exceed a ratio of10, except for those readers with very large screens, i.e.having a diagonal greater than540 mm where the ratio shall not exceed15. 4.3.1.2.2 Front projection readers The relationshi

37、p in luminance between the maximum value and the minimum value shall not exceed a ratio of5. 4.3.2 Screen contrast 4.3.2.1 Procedure Measure screen contrast in accordance with ISO7565. 4.3.2.2 Requirements The screen contrast expressed as a luminance ratio shall be a minimum of10. In general, a high

38、er screen contrast is preferred. 4.4 Safety 4.4.1 Stability of reader Readers that are designed to stand on a flat and horizontal surface such as a desk, table or floor shall not tip over when tested in accordance with the method described in IEC950. 4.4.2 Temperature 4.4.2.1 Film temperature in the

39、 film gate Film gate temperatures shall be measured in accordance with ISO7565. The temperature of the film in the film gate shall not exceed70 C when measured after60min of continuous operation with the reader in focus and the lamp operating at the highest brightness setting permitted by the reader

40、. Nominal magnification Character of ISO No. 1 microtest chart to be read 10/1 15/1 20/1 25/1 30/1 35/1 40/1 45/1 50/1 125 112 100 90 80 71 a 63 a 56 a 50 a a The difficulty in obtaining such fine characters on the microtest chart can make the measurements incorrect. Nominal magnification Pattern of

41、 ISO No. 2 microtest chart to be read line pairs/mm 10/1 15/1 20/1 25/1 30/1 35/1 40/1 45/1 50/1 6,3 4,5 4,0 3,6 3,2 3,2 2,8 a 2,5 a 2,5 a NOTECalculations involving the reduction used to make the microtest chart may be necessary to determine the actual resolution specified inTable 2. a The difficul

42、ty in obtaining such fine characters on the microtest chart can make the measurements incorrect.ISO 6198:1993(E) BSI 11-1999 3 4.4.2.2 Temperature of reader Temperatures of the exposed surfaces of a reader shall be measured in accordance with IEC950. The temperature of reader surfaces shall not exce

43、ed the values given after the reader has been operated in an area with an ambient temperature of23 C 2 C for1h. The voltage used shall be equal to1,06 times the highest rated voltage (if it is known) or1,06 times the average voltage of the stated voltage range. 4.4.3 Fire hazard Readers shall be con

44、structed in accordance with the appropriate requirements of IEC950. Resistance to spread of flames and nonemission of toxic fumes are particularly important. 4.5 Noise Airborne noise emitted by readers shall be measured while the reader is operated at its rated voltage under two operating modes: dur

45、ing normal viewing conditions; during microform changing or transport such as rewinding roll film, changing cartridges or microfiche in the carrier. The airborne noise shall be measured in accordance with ISO7779. The A-weighted sound power level obtained by using the procedures specified in ISO7779

46、 shall be used for comparison of the airborne noise emitted by different readers. Sound power level data may be supplemented by the A-weighted sound pressure level measured at the operators position(s) or bystanders position(s) as defined in ISO7779. For each mode of operation, the appropriate state

47、ments of ISO7779 shall be used to indicate the sound pressure level. For readers that are to be used in a quiet area such as a library reading room, the A-weighted sound pressure level during normal viewing conditions shall not exceed50dB, and during any rapid motion shall not exceed60dB. Impulsive

48、noise for the equipment should not exceed75dB. NOTEMeasurement area of the screen is defined as the central area formed by connecting the points of the diagonals that are located from the corners at a distance of10% of the screen diagonal lengths. That is, the area within the dashed rectangle. If th

49、e corners of the screen are rounded, the length of the diagonals and the points from which readings are taken shall be calculated from the extrapolated edges of the screen. Screens may be either square or a vertical or horizontal rectangle. Figure 1 Measurement area of reader screenISO 6198:1993(E) 4 BSI 11-1999 Table 3 Temperature of different parts of the reader 5 Additional required characteristics When applicable, a reader shall comply with the following requirements. 5.1 Image