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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO 11698-1:2000 ICS 3
2、7.080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Micrographics Methods of measuring image quality produced by aperture card scanners Part 1: Characteristics of the test images Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Cop
3、y, (c) BSI This British Standard, having been prepared under the direction of the DISC Board, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 BSI 02-2001 ISBN 0 580 36922 6 BS ISO 11698-1:2000 Amendments issued since publication Amd. No.DateComm
4、ents National foreword This British Standard reproduces verbatim ISO 11698-1:2000 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee IDT/1, Document imaging applications, to Subcommittee IDT/1/1, Quality, which has the responsi
5、bility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list
6、 of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standard
7、s Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard doe
8、s not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the docu
9、ment was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 11698-1:2000(E) INTERNATIONAL STANDARD ISO 11698-1 First edition 2000-08-01 Micrographics Methods of measuring image quality produced by aperture card
10、 scanners Part 1: Characteristics of the test images Micrographie Mthodes de mesurage de la qualit de limage produite par les numrisateurs de cartes fentre Partie 1: Caractristiques des images dessai Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (
11、c) BSI ISO 11698-1:2000(E) ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies
12、). 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 organizations, governmental and no
13、n-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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Par
14、t 3. 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 is drawn to the possibility that some of the elements of t
15、his part of ISO 11698 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 11698-1 was prepared by Technical Committee ISO/TC 171, Document imaging applications, Subcommittee SC 1, Quality. ISO 11698 consists
16、 of the following parts, under the general title Micrographics Methods of measuring image quality produced by aperture card scanners: ?Part 1: Characteristics of the test images ?Part 2: Quality criteria and control Annex A of this part of ISO 11698 is for information only. Licensed Copy: sheffieldu
17、n sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) iv Introduction Scanning of microimages in aperture cards for use in CAD and electronic information systems is of great importance. This International Standard describes a series of test aperture ca
18、rd microimages, which can be used to evaluate the output quality resulting from aperture card scanning systems. The procedures for the use of these microimages is described in ISO 11698-2. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTE
19、RNATIONAL STANDARDISO 11698-1:2000(E) 1 Micrographics Methods of measuring image quality produced by aperture card scanners Part 1: Characteristics of the test images 1Scope This part of ISO 11698 specifies the characteristics of the test images used for evaluating or checking the quality of electro
20、nic images generated by aperture card scanners. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 11698. For dated references, subsequent amendments to, or revisions of, any of these publication
21、s do not apply. However, parties to agreements based on this part of ISO 11698 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Memb
22、ers of ISO and IEC maintain registers of currently valid International Standards. ISO 3272-1:1983, Microfilming of technical drawings and other drawing office documents Part 1: Operating procedures. ISO 6196-1:1993, Micrographics Vocabulary Part 1: General terms. ISO 6196-4:1998, Micrographics Vocab
23、ulary Part 4: Materials and packaging. ISO 6196-5:1987, Micrographics Vocabulary Part 5: Quality of images, legibility, inspection. ISO 6196-6:1992, Micrographics Vocabulary Part 6: Equipment. ISO 6428:1982, Technical drawings Requirements for microcopying. ISO 12651:1999, Electronic imaging Vocabul
24、ary. 3Terms and definitions For the purposes of this part of ISO 11698, the terms and definitions given in ISO 6196 and ISO 12651 apply. Where a term appears in both of these International Standards it is essential that the definition used is appropriate to the context of the term. Licensed Copy: sh
25、effieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 2 4Specifications for test images 4.1General Each test card shall be an aperture card with inserted microimage, or a piece of photographic film the size of an aperture card having an image i
26、n that area corresponding to the aperture of a card, and right reading when viewed through the base. NOTERecommended nominal film thickness is 0,18 mm. 4.2Test image type 1 Test image type 1 is used for evaluating or checking image centring, scaling, capture size, line straightness, orthogonality an
27、d uniformity of line width. Seven Type 1 test images are specified, one for each combination of sheet size and orientation shown in Table 1. A type 1 test image, see example Figure 1, shall comprise: ?a rectangle, divided by five vertical lines at intervals of one sixth of its length and a horizonta
28、l line from the midpoints of the vertical sides, of which the corners and midpoints of the sides shall be joined by diagonal lines; ?a larger rectangle, concentric with the smaller one, bounded by a thick broken line the inner edge of which represents the image area of microimage required to be capt
29、ured by a scanner, equal in size to the nominal sheet size specified in ISO 3272-1 divided by the nominal reduction ratio specified for that size; ?a 4 mm scale, graduated from 2 mm to?2 mm at intervals of 0,1 mm and 1 mm, extending each line that forms a corner in the inner rectangle. Points on the
30、 inner rectangle shall be assigned letters A-H and the intersection of AC and BD letter O as shown in Figure 1. Dimensions shall be assigned to lines AB and AD as specified in Table 1, giving also the reduction ratio applicable to the microfilm image. Table 1 Test image type 1 sheet size, orientatio
31、n and dimensions Test image Sheet size Orientation Dimension AB mm Dimension AD mm 1A0Landscape1068,9720,9 2A1Landscape756,2509,2 3A2Landscape534,0360,0 4A3Portrait237,0360,0 5A3Landscape360,0237,0 6A4Portrait210,0297,0 7A4Landscape237,0150,0 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13
32、:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 3 4.3Test image type 2 Test image type 2, see example in Figure 2, is used for evaluating or checking resolving power. It shall contain five test targets, one at the centre and one at each corner. Each test target shall comprise:
33、?two Pestrecov stars, a square containing a radial pattern of lines having equal angular frequency and concentric circles which indicate the location of radial line frequencies equivalent to 2, 4 and 8 line pairs per millimetre; ?two sections of ISO No. 2 test charts having patterns with spatial fre
34、quency in the range 84-300 line pairs per millimetre; ?four sections of Pestrecov star pattern. The size of each of the test targets shall be such that they do not overlap each other, and enable identification of the elements. Frequency information should be added to the target as appropriate. 4.4Te
35、st image type 3 Five type 3 test images are specified, one each for the sheet sizes in the series A0-A4. Test image type 3, see example Figure 3, is used for evaluating or checking the performance of the scanner when scanning different line widths. It shall comprise a number of test targets as speci
36、fied in Table 2. Each test target shall comprise three patterns having two sets of lines of thickness equal to one of the series 0,30-1,0 specified in ISO 6428, equally spaced and at right angles to each other. ?One pattern shall be positive-appearing and have seven sets of lines and spaces of equal
37、 width; ?one pattern shall be positive-appearing and have six sets of lines and spaces at least five times greater than line width; ?one pattern shall be negative-appearing and have six sets of lines and spaces at least five times greater than line width. The test targets should be regularly arrange
38、d to cover as much of the microimage area as possible. Table 2 Number of test targets Sheet size Number of targets A41 A32 A24 A16 A06 4.5Test image type 4 Test image type 4, see example Figure 4, is used for evaluating or checking how well the scanner optics are focused. It shall comprise five test
39、 targets on a background, half of which shall contain horizontal lines and the other half vertical lines having spatial frequency of fifty lines pairs per millimetre. Each test target shall comprise two patterns having four sets of lines with increasing spatial frequency, each pattern designated by
40、a letter A-J, in the form of a broken rectangle symmetrical about the lettered axis. The spatial frequencies of line sets are specified in Table 3. The long axes of each pair of patterns shall be at 45 degrees to each other. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2
41、006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 4 Table 3 Spatial frequency of line sets PatternABCDEFGHIJ Line pairs per mm 21,525,831,037,244,653,564,277,092,5111,0 4.6Test image type 5 Test image type 5, see example Figure 5, is used for evaluating or checking legibility. It shall comprise tw
42、o blocks of character strings of a typeface similar in height to width ratio, line thickness and style to that used for written information on technical drawings. The character sizes used should be from the smallest available on the system designated zero, increasing in equal steps. The character si
43、ze identifier of lines on each block shall increase from top to bottom by an increment of two. One block shall contain even numbered character size strings from 0 to 62 and the other odd numbered character size strings from 1 to 63. Character lines shall comprise Roman alphabetic characters in alpha
44、betic order and where length of line permits Arabic numerical characters in numerical order. Each character line shall include its character size identifier in numerical characters after the first alphabetic character. 4.7User target It may be helpful in some circumstances to define a user target, w
45、ith image attributes typical of those used in practice. Annex A gives details of a typical user target for technical drawing applications. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 5 NOTEIn dimensions AB and AD, the
46、 (1:15) denotes the reduction ratio used in producing the test image and is important since the actual dimensions on the film can only be known if the reduction ratio is known. Figure 1 Sample layout of test image type 1 (set of 7) for checking image centring, scaling, capture size Figure 2 Sample l
47、ayout of test image type 2 for checking resolving power Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 6 Figure 3 Sample layout of test image type 3 (set of 5) for checking line width Licensed Copy: sheffieldun sheffield
48、un, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 7 Figure 4 Sample layout of test image type 4 for checking focus Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 8 Figure 5 Sample
49、 layout of test image type 5 for checking character legibility Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:11:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11698-1:2000(E) 9 Annex A (informative) User prepared target A.1 General Some scanner functions e.g. image enhancement are designed to perform best when scanning typical technical drawings and can give spurious results when scanning targets such as those specified in the main body of this International Standard. For this reason it is often help
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