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 imagesThis British Standard, having been prepared under the direction of the DISC Board, was published
3、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. Date Comments National foreword This British Standard reproduces verbatim ISO 11698-1:2000 and implements it as the
4、 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 responsibility to: aid enquirers to understand the text; present to the responsible international/European committ
5、ee 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 of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-refe
6、rences 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 Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Bri
7、tish 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 does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fro
8、nt 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 document was last issued.Reference number ISO 11698-1:2000(E) INTERNATIONAL STANDARD ISO 11698-1 First edi
9、tion 2000-08-01 Micrographics Methods of measuring image quality produced by aperture card 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 dessaiISO11698-1:
10、2000(E) ii ISO 11698-1:2000(E)iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body int
11、erested 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 liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnic
12、al Commission (IEC) on all matters of 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. Publicat
13、ion 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 this part of ISO 11698 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pa
14、tent rights. International Standard ISO 11698-1 was prepared by Technical Committee ISO/TC 171, Document imaging applications, Subcommittee SC 1, Quality. ISO 11698 consists of the following parts, under the general title Micrographics Methods of measuring image quality produced by aperture card sca
15、nners: 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.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. Thi
16、s International Standard describes a series of test aperture card 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.INTERNATIONAL STANDARD ISO 11698-1:2000(E)1 Micro
17、graphics Methods of measuring image quality produced by aperture card scanners Part 1: Characteristics of the test images 1 Scope This part of ISO 11698 specifies the characteristics of the test images used for evaluating or checking the quality of electronic images generated by aperture card scanne
18、rs. 2 Normative 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 publications do not apply. However, parties to agreeme
19、nts 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. Members of ISO and IEC maintain registers of cu
20、rrently 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 Vocabulary Part 4: Materials and packaging. ISO
21、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 Vocabulary. 3 Terms and definitions For the purpos
22、es 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.ISO 11698-1:2000(E) 2 4 Specifications for test images 4.1 G
23、eneral 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 in that area corresponding to the aperture of a card, and right reading when viewed through the base. NOTE Recommended nominal film thickness is 0,18
24、 mm. 4.2 Test image type 1 Test image type 1 is used for evaluating or checking image centring, scaling, capture size, line straightness, orthogonality and 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 typ
25、e 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 horizontal 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 rectan
26、gle, 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 captured 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
27、 4 mm scale, graduated from 2m mt o 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 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
28、 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, orientation and dimensions Test image Sheet size Orientation Dimension AB mm Dimension AD mm 1 A0 Landscape 1068,9 720,9 2 A1 Landscape 756,2 509,2 3 A2 Landsc
29、ape 534,0 360,0 4 A3 Portrait 237,0 360,0 5 A3 Landscape 360,0 237,0 6 A4 Portrait 210,0 297,0 7 A4 Landscape 237,0 150,0ISO 11698-1:2000(E)3 4.3 Test 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
30、at the centre and one at each corner. Each test target shall comprise: 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; t
31、wo sections of ISO No. 2 test charts having patterns with spatial frequency 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. Frequ
32、ency information should be added to the target as appropriate. 4.4 Test 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 diffe
33、rent line widths. It shall comprise a number of test targets as specified 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
34、 positive-appearing and have seven sets of lines and spaces of equal 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 gre
35、ater than line width. The test targets should be regularly arranged to cover as much of the microimage area as possible. Table 2 Number of test targets Sheet size Number of targets A4 1 A3 2 A2 4 A1 6 A0 6 4.5 Test image type 4 Test image type 4, see example Figure 4, is used for evaluating or check
36、ing how well the scanner optics are focused. It shall comprise five test 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
37、 of lines with increasing spatial frequency, each pattern designated by 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.ISO
38、11698-1:2000(E) 4 Table 3 Spatial frequency of line sets Pattern ABCDEFGHIJ Line pairs per mm 21,5 25,8 31,0 37,2 44,6 53,5 64,2 77,0 92,5 111,0 4.6 Test image type 5 Test image type 5, see example Figure 5, is used for evaluating or checking legibility. It shall comprise two blocks of character str
39、ings 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 size identifier of lines on
40、 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 alphabetic order and where len
41、gth 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. 4.7 User target It may be helpful in some circumstances to define a user target, with image attributes typ
42、ical of those used in practice. Annex A gives details of a typical user target for technical drawing applications.ISO 11698-1:2000(E)5 NOTE In dimensions AB and AD, the (1:15) denotes the reduction ratio used in producing the test image and is important since the actual dimensions on the film can on
43、ly 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 layout of test image type 2 for checking resolving powerISO 11698-1:2000(E) 6 Figure 3 Sample layout of test image type 3 (set of 5)
44、for checking line widthISO 11698-1:2000(E)7 Figure 4 Sample layout of test image type 4 for checking focusISO 11698-1:2000(E) 8 Figure 5 Sample layout of test image type 5 for checking character legibilityISO 11698-1:2000(E)9 Annex A (informative) User prepared target A.1 General Some scanner functi
45、ons 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 helpful to assess scanner performance subjectively
46、 using one or more test images that are typical of the microimages to be scanned. Test image type 6 is intended for this purpose. Users may use a test image of their own if preferred. Additional test images may be used if more than one distinct type of image, such as negative-appearing and positive-
47、appearing, are scanned. A.2 Test image type 6 Test image type 6, consists of an A1 size technical drawing made in accordance with ISO 6428 and filmed in accordance with ISO 3272-1. The drawing should contain a variety of typical features that may be used to judge the performance of a scanner quickly
48、 and subjectively. An example of these features, which have been ringed and lettered in Figure A.1, correspond to: A Weak pencil text B Solid characters C Solid fill areas D Weak hatching E Mixed ink and pencil lettering F Close lines G Hole centre markersISO 11698-1:2000(E) 10 Figure A.1 Sample of
49、test image type 6, engineering drawingBS ISO 11698-1:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on s
