BS-ISO-446-2004.pdf
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1、BRITISH STANDARD BS ISO 446:2004 Micrographics ISO character and ISO test chart No. 1 Description and use ICS 37.080 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 446:2004 This British Standard was published under the authority of
2、 the Standards Policy and Strategy Committee on 28 April 2006 BSI 2006 ISBN 0 580 48170 0 National foreword This British Standard reproduces verbatim ISO 446:2004 and implements it as the UK national standard. It supersedes BS 4189:1967 which is withdrawn. The UK participation in its preparation was
3、 entrusted by Technical Committee IDT/1, Document management applications, to Subcommittee IDT/1/1, Quality, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement i
4、nternational publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to i
5、nclude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any en
6、quiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank pag
7、e, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Refe
8、rence number ISO 446:2004(E) INTERNATIONAL STANDARD ISO 446 Third edition 2004-03-15 Micrographics ISO character and ISO test chart No. 1 Description and use Micrographie Caractre ISO et mire ISO N 1 Description et utliisation BS ISO 446:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13
9、:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Forewordiv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Description and use of the ISO
10、 character 2 4.1 Description 2 4.2 Use 2 5 Production of ISO test chart No. 1 2 5.1 Base 2 5.2 Test chart lay-out 4 5.3 Density-measuring areas . 6 5.4 Identification 6 5.5 Certification of ISO No. 1 test charts 7 6 Procedure for using ISO test chart No. 1 7 6.1 Method 7 6.2 Density of the film. 7 6
11、.3 Legibility control . 7 BS ISO 446:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wo
12、rk 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 organizations, governmental and non-governm
13、ental, 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The
14、main task 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.
15、Attention 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 446 was prepared by Technical Committee ISO/TC 171, Document management applications, Subcommitte
16、e SC 1, Quality. This third edition cancels and replaces the second edition (ISO 446:1991), which has been technically revised. BS ISO 446:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction Most processes produce images of l
17、ower quality; among others diffusion transfer, if it still exists, is capable of enhancing quality. This degradation may go so far as to make the information illegible. Poor legibility may also cause visual fatigue after prolonged viewing. The legibility of an image can be assessed by measuring the
18、limit of resolution, i.e. the ability to distinguish lines in different directions. However, the limit of resolution corresponds to a quality level insufficient to permit easy reading, and to prolong it without visual fatigue. A criterion which better simulates actual working conditions was sought.
19、The ISO character, which is a conventional character similar to typefaces used in the printing industry, the outline and details of which should be distinguished without difficulty, meets these requirements. The main practical applications of the ISO character are based on the following experimental
20、 properties. a) If a particular reproduction process gives an identifiable image from a group of ISO characters of a certain height, it can be assumed that the same process will produce, from a printed text of comparable typeface size, a satisfactory image and, in particular, one that is sharp enoug
21、h to be read, without undue visual fatigue for the viewer. b) In general, the identification of the same limiting group of ISO characters by different observers gives substantially identical results. Care should be taken when referencing this International Standard in other standards. Some countries
22、 do not use this standard or use alternative standards (such as ISO 3334:1989, Micrographics ISO resolution test chart No. 2 Description and use). BS ISO 446:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffield
23、un sheffieldun, na, Sun Nov 26 13:15:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Micrographics ISO character and ISO test chart No. 1 Description and use 1 Scope This International Standard specifies the characteristics of the black and white ISO character and of the ISO test chart No. 1, as wel
24、l as their use. It applies to the quality control of the microimages produced with a given micrographic system and the assessment of the potential legibility of the documents recorded using that system. 2 Normative references The following referenced documents are indispensable for the application o
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