1、BRITISH STANDARD BS ISO 14648-2:2001 Micrographics Quality control of COM recorders that generate images using a single internal display system Part 2: Method of use ICS 37.080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Incorporating August 2009 corrigendum National forew
2、ord This British Standard is the UK implementation of ISO 14648-2:2001, incorporating corrigendum August 2009. The UK participation in its preparation was entrusted by Technical Committee IDT/1, Document imaging applications, to Subcommittee IDT/1/1, Quality. A list of organizations represented on t
3、his subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS ISO 14648-2:2
4、001 This British Standard, having been prepared under the direction of the DISC Board, was published under the authority of the Standards Policy and Strategy Committee on 10 January 2002 BSI 2009 Amendments/corrigenda issued since publication Date Comments 31 December 2009 Implementation of ISO corr
5、igendum August 2009. Text deleted from 5.2.6 ISBN 978 0 580 68854 6 Reference number ISO 14648-2:2001(E)INTERNATIONAL STANDARD ISO 14648-2 First edition 2001-12-01 Micrographics Quality control of COM recorders that generate images using a single internal display system Part 2: Method of use Microgr
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11、-mail coirypthgiso.c h Web ww.wiso.ch Prinetdni wSizterland ii BS ISO 14648-2:2001ISO 14648-2:2001(E) iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norm
12、ally 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-governmental, in liaison with ISO, also take part in t
13、he 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 3. The main task of technical committees is to prepare
14、 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. Attention is drawn to the possibility that some
15、 of the elements of this part of ISO 14648 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 14648-2 was prepared by Technical Committee ISO/TC 171, Document imaging applications, Subcommittee SC 1, Quality. ISO 14648 consists o
16、f the following parts, under the general title Micrographics Quality control of COM recorders that generate images using a single internal display system: Part 1: Characteristics of the software test target Part 2: Method of use BS ISO 14648-2:2001ISO 14648-2:2001(E) iv Introduction This part of ISO
17、 14648 specifies methods for using the test targets specified in ISO 14648-1 for initial Computer Output Microfilm (COM) recorder testing, to establish a quality reference and for periodic testing of COM image quality. BS ISO 14648-2:2001INTERNATIONAL STANDARD ISO 14648-2:2001(E)1Micrographics Quali
18、ty control of COM recorders that generate images using a single internal display system Part 2: Method of use 1 Scope This part of ISO 14648 specifies methods for using the software test targets specified in ISO 14648-1. 2 Normative references The following normative documents contain provisions whi
19、ch, through reference in this text, constitute provisions of this part of ISO 14648. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 14648 are encouraged to investigate the possibility o
20、f 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 currently valid International Standards. ISO 5-2:1991, Photography Density measuremen
21、ts Part 2: Geometric conditions for transmission density ISO 5-3:1995, Photography Density measurements Part 3: Spectral conditions ISO 6196-1:1993, Micrographics Vocabulary Part 1: General terms ISO 6196-3:1997, Micrographics Vocabulary Part 3: Film processing ISO 6196-5:1987, Micrographics Vocabul
22、ary Part 5: Quality of images, legibility, inspection ISO 6196-6:1992, Micrographics Vocabulary Part 6: Equipment ISO 6196-7:1992, Micrographics Vocabulary Part 7: Computer micrographics ISO 8514-1:2000, Micrographics Alphanumeric computer output microforms Quality control Part 1: Characteristics of
23、 the test slide and test data ISO 8514-2:2000, Micrographics Alphanumeric computer output microforms Quality control Part 2: Method 3 Terms and definitions For the purposes of this part of ISO 14648, the terms and definitions given in ISO 6196 and ISO 14648-1 apply. BS ISO 14648-2:2001ISO 14648-2:20
24、01(E) 2 4 Outline of the method This test method may be used initially to establish the quality of the images recorded by a COM system. The results of the initial test may be used either to establish an initial quality reference for the system to which future output can be compared or the initial ou
25、tput may indicate certain repairs or adjustments that should be made to bring the system up to the required specification. The primary use of the target should be to establish a working quality reference and then to use it as a means to monitor consistency of performance on a periodic basis. If ther
26、e are several COM recorder systems in use, the test target also provides a method of checking that equivalent performance is being obtained from each recorder. The user application may demand that the best image quality be required in the duplicates rather than the master microform. In this case, th
27、e optimum exposure level is determined by inspecting the duplicate microform images made on a duplicator that has been properly calibrated and adjusted. 5 Test procedure 5.1 General The following procedure first establishes the optimum image obtainable from the COM recorder system by optimizing the
28、exposure setting. Various parameters characterizing the COM recorder system performance can then be established by measurement and observation of the output microform image quality. 5.2 Establishing the COM recorder imaging quality parameters 5.2.1 COM system set-up Ensure that the COM system is fun
29、ctioning properly before starting these tests. The system shall be warmed up in accordance with the manufacturers recommendations. Film known to be capable of producing microimages of suitable quality shall be used. The processor shall be up to temperature and, where appropriate fresh chemicals shal
30、l be used, shall be warmed to the specified temperature. 5.2.2 Test grid Generate a pattern of characters as specified in ISO 8514-1 and check that the image produced is in accordance with ISO 8514-2. 5.2.3 Optimizing the exposure setting Fill a microfiche or a suitable equivalent length of microfil
31、m with images of the test target, using Target 1 or Target 2 as appropriate. If the system software has the capability to run a series of gradually increasing intensities from column to column, such a series shall be made over a wide range of intensities. If this capability does not exist, then seve
32、ral sets of images shall be produced, each at a different intensity, to uniformly and adequately cover the intensity range. The optimum exposure level for the target shall be the exposure level which gives an image of the EHN, OCR-B or alternate fonts in which the narrowest line width characters app
33、ear underexposed and the thickest line width characters appear overexposed. Either the images on the master microforms or the duplicate are examined depending on user requirements. Record the exposure setting that produced the chosen optimum result. 5.2.4 Establishing the optimum density Having sele
34、cted the optimum exposure level, measure the visual diffuse transmission density of the maximum density area within that frame with a densitometer. Record the density of the solid and clear areas (e.g. those corresponding to all dots on and all dots off). BS ISO 14648-2:2001ISO 14648-2:2001(E) 35.2.
35、5 COM reduction ratio The reduction ratio of the COM recorder shall be determined using the border of Target 1 or the measuring scales on Target 2. Measure the appropriate distances on the microform, preferably using a travelling microscope or a microscope with an X-Y axis measuring capability. A ca
36、librated microform reader may be used to make these measurements. On Target 1, the horizontal distance between the border lines is 340,4 mm and the vertical distance is 279,4 mm, when measured on the equivalent full-size original. On Target 2, the horizontal distance of the relevant part of the meas
37、uring scale is 152,4 mm at 1:24, 266,7 mm at 1:42 and 304,8 mm at 1:48, when measured on the equivalent full-size original. The vertical distance of the measuring scale is 152,4 mm at 1:24, 266,7 mm at 1:42 and 152,6 mm at 1:48, when measured on the equivalent full-size original. Measure the length
38、of both the horizontal and the vertical scale. The vertical and horizontal reduction ratio may be different for different types of recorders. The reduction ratio is generally fixed in a COM system by the lenses and does not vary except when the lenses are changed. Hence, this test is useful only in
39、determining if the specification for reduction ratio is being met or verified if in question. Typically, the reduction ratio should be within 1 % of the stated value, but the COM system manufacturers specifications should be consulted. 5.2.6 COM resolving power The test charts at the four corners an
40、d in the centre of Target 2, and in the upper left and right corners of Target 1, shall be used to determine the resolving power obtained on the microform and to check the focus of the image. The resolving power shall be determined by the smallest or finest test pattern that has an observable line p
41、attern when viewed with a microscope having a minimum magnification equal to the reduction ratio used for the microform images. 5.2.7 Diagonal lines The diagonal lines shall be checked for straightness and shall be examined for stepping. 5.2.8 COM character legibility areas The COM character legibil
42、ity areas shall be used to judge character legibility. 5.2.9 Alternative font area Check the quality of the characters located in the alternate font area. In routine work, all characters in this area should be easily legible. The characters located in this area are a sample of standard characters re
43、commended for use in making standard (or working) test targets, or are special fonts or script selected by the user. 6 Density of first generation microform 6.1 General Produce images of the test target on film and make density measurements on these images as follows. BS ISO 14648-2:2001ISO 14648-2:
44、2001(E) 4 6.2 Density test areas There are two areas used for the measurement of density. The density measuring area on the right side of the test slide shall be used to measure the maximum density when positive-appearing film is used or to measure the minimum density when negative-appearing film is
45、 used. In addition, the centre square density area shall be used to measure the minimum density (base plus fog) on positive-appearing film and the maximum density for negative-appearing film. The halftone screen area (square density area on the left) shall be used to monitor the consistency of expos
46、ure and processing. 6.3 Density values Table 1 gives recommended visual diffuse transmission density measured on a densitometer that has spectral conformance to ISO 5-3 and geometric conformance to ISO 5-2, or Status M Blue density values. Table 1 Summary of acceptable density limits Film type Proce
47、ss Density measurement method Minimum background density Maximum clear area density Minimum density difference Silver gelatin Conventional Printing or visual diffuse 0,75 0,15 or 0,10 plus base a0,60 Silver gelatin Full reversal or direct positive Printing or visual diffuse 1,50 (1,80 preferred) 0,2
48、0 plus base a1,30 Thermally- processed silver Heat Printing ISO type 1 1,00 0,40 plus base a0,60 (0,80 preferred) aDensity of the uncoated base. 7 Test procedures 7.1 General The following test procedures shall be performed for the following purposes: a) installation and maintenance testing; b) rout
49、ine checking. 7.2 Installation and maintenance testing 7.2.1 Equipment set-up and tests Perform all the tests described in clause 5. 7.2.2 Select optimum settings Determine and record the optimum COM recorder system settings as specified in clause 5. BS ISO 14648-2:2001ISO 14648-2:2001(E) 57.2.3 Generation of microforms Adjust the COM recorder to these optimum settings and generate a microfiche or its microfilm equivalent completely filled with images of the test target. 7.2.4 Record data Record the densities o
