1、BRITISH STANDARD BS ISO 14648-1:2001 Micrographics Quality control of COM recorders that generate images using a single internal display system Part 1: Characteristics of the software test target ICS 37.080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 14648-1:2001 Thi
2、s 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 10 January 2002 ISBN 0 580 38802 6 National foreword This British Standard reproduces verbatim ISO 14648-1:2001 and
3、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 responsibility to: A list of organizations represented on this subcommittee can be obtained on
4、 request to its secretary. Cross-references The British Standards which implement international or European 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
5、 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 does not of itself confer immunity from legal obligation
6、s. 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. Summary of pag
7、es This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date C
8、omments Reference number ISO 14648-1:2001(E)INTERNATIONAL STANDARD ISO 14648-1 First edition 2001-12-01 Micrographics Quality control of COM recorders that generate images using a single internal display system Part 1: Characteristics of the software test target Micrographie Contrle de la qualit des
9、 microformes produites sur un systme lectronique (COM) de gnration dimage adressage de points Partie 1: Caractristiques de la cible contrle de la qualit ISO 14648-1:2001(E) ii ISO 14648-1:2001(E) iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of nation
10、al standards 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. Internatio
11、nal organizations, 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. International Standards are drafted in accordance with the rule
12、s given in the ISO/IEC Directives, Part 3. The 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 l
13、east 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some 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 14648-1 was prepared by Technical Committ
14、ee ISO/TC 171, Document imaging applications, Subcommittee SC 1, Quality. ISO 14648 consists of 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
15、 Part 2: Method of use ISO 14648-1:2001(E) iv Introduction This part of ISO 14648 provides a specification for characteristics of a software test target used for the image quality evaluation of Computer Output Microfilm (COM) recorder systems that generate images using a single internal display syst
16、em. INTERNATIONAL STANDARD ISO 14648-1:2001(E)1Micrographics Quality control of COM recorders that generate images using a single internal display system Part 1: Characteristics of the software test target 1 Scope This part of ISO 14648 specifies the characteristics of a software test target that is
17、 electronically generated, to be used in COM recorder systems that can accept electronic forms. The components have been designed to check or test certain capabilities of the COM recorder system in order to enable image quality to be assessed and maintained. The recording method (i.e. laser scanner,
18、 cathode ray tube, light emitting diode, etc.) is not relevant in establishing the software test target components. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 14648. For dated references
19、, 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 of applying the most recent editions of the normative documents indicated below. For undated references, t
20、he 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 measurements Part 2: Geometric conditions for transmission density ISO 5-3:1995, Photography Density measurements P
21、art 3: Spectral conditions ISO 6196-1:1993, Micrographics Vocabulary Part 1: General terms ISO 6196-5:1987, Micrographics Vocabulary Part 5: Quality of images, legibility, inspection ISO 6196-6:1992, Micrographics Vocabulary Part 6: Equipment ISO 6196-7:1992, Micrographics Vocabulary Part 7: Compute
22、r micrographics 3 Terms and definitions For the purposes of this part of ISO 14648, the terms and definitions given in ISO 6196 and the following apply. 3.1 dot smallest unit that can be recorded on microfilm by the COM recorder system ISO 14648-1:2001(E) 2 4 Test targets 4.1 General Two test target
23、s are specified. Target 1 (see Figure 2) is intended for COM systems that have limited bit map memory. The complexity and number of components on the test target are limited to a few basic types. For COM systems having greater bit map memory capability, Target 2 (see Figure 3) has more components wi
24、th increased complexity. 4.2 Dot spacing The centre to centre spacing of consecutive dots is related to the resolution specification of the original full document size being recorded at the reduced microfilm size. For example, if the original is specified at a resolution of 240 dpi then the dot spac
25、ing at full size is 0,004 2 inches. If this is reduced to microfilm at a reduction of 48 then the pixel spacing on film is 0,000 087 inches. As depicted in Figure 1, the dot overlap ratio is equal to the diameter/centre to centre spacing. The dot diameter is typically larger than the centre to centr
26、e spacing so that the recording of consecutive dots is smoothed to form a line. The ratio of dot diameter to dot spacing is generally a factor chosen between 1,3 and 1,5 by the COM recorder system manufacturer. Thus, the dot diameter varies with the reduction and also with the resolution. 4.3 Grid l
27、ayout The grid shall consist of 132 cells horizontally and 64 cells vertically forming columns and rows in which characters may be placed. The outside dimensions of the grid conform to the text dimensions 335,3 mm in the horizontal direction and 270,9 mm in the vertical direction at full size. 4.4 B
28、order A line of single dot width shall enclose the grid patterns of Target 1 and Target 2, see Figures 2 and 3, spaced from the grid pattern by one cell size. The size of the border in terms of the grid pattern is 134 columns by 66 rows. It shall be generated at the extreme edge of the cells specifi
29、ed in 4.3. Key 1 Dots 2 Diameter 3 Centre to centre Figure 1 Dot overlap ISO 14648-1:2001(E) 3Figure 2 Sample layout of Target 1 ISO 14648-1:2001(E) 4 Figure 3 Sample layout of Target 2 4.5 Test charts A test chart shall comprise five test patterns. Each test pattern shall comprise two groups of six
30、 lines and five spaces of equal width, each group at right angles to the other, numbered one to five to indicate its line width in dots. Each line shall be 48 dots in length. Spaces between horizontal and vertical groups shall be 10 dots and 27 dots respectively. Target 1 shall include two test char
31、ts located in the upper left and right corners of the target. Target 2 shall include six test charts, one in each corner and two near the centre of the target. The notional corner of the smallest pattern in each test chart shall be positioned as specified in Table 1. NOTE One or more patterns of a t
32、est chart may not be resolvable depending on the COM recorder system adjustment, accuracy of focus and degree of dot overlap (see Figure 1) designed into the system to smooth out consecutive dot recording to appear as a line. However, the smallest pattern that is resolvable by the human eye with the
33、 aid of a microscope can be used for future reference in detecting any changes in system performance. ISO 14648-1:2001(E) 5Table 1 Grid positions of test charts Pattern Column Row Top left 2 1 Top right 131 1 Centre left 64 36 Centre right 69 36 Bottom left 2 64 Bottom right 131 64 4.6 Density measu
34、ring areas Three density patches, 40 columns wide by 24 rows high enclosed in a box having a two dot line width, shall be provided. There shall be a blank area one column wide between the sides of a box and its density patch and a similar area half a row high between the top and bottom of a box and
35、its density patch. The patch on the right side shall be generated as solid (all dots on), the patch in the centre shall be clear (all dots off) and the patch on the left shall be cross-hatched with lines one dot wide and spaces two dots wide. An inner border one dot wide, delineating the clear area
36、of the centre patch, shall be produced. The locations of the patches, referenced to the top left corners of the outer box, shall be as specified in Table 2. Table 2 Density area positions Box type Top left coordinate Solid Column 90, row 32 Cross-hatched Column 2, row 32 Clear Column 46, row 39 4.7
37、Diagonal lines There shall be two lines, one dot width, located as in Table 3. The lines shall run through the entire cell that is identified as an end point. Table 3 Diagonal line positions Line Top location Bottom location Left Column 22, row 18 Column 8, row 26 Right Column 111, row 18 Column 125
38、, row 26 4.8 COM character legibility areas The primary character pattern used for judging legibility shall comprise of upper case letters E, H and N, as generated by the COM recorder, having pitches of 0,394, 0,472 and 0,591 characters per millimetre. The areas shall be positioned as in Table 4, an
39、d Figures 2 and 3. ISO 14648-1:2001(E) 6 Table 4 Character legibility test positions Position Start column Start row Left 3 17 Right 130 17 Centre (two patterns, Target 1 only) 64, 69 32 4.9 Alternative font area The area from row 16 to row 28 and from column 32 to column 102 shall be reserved for a
40、lternative fonts. Characters of other fonts appropriate for typical applications may be used. 4.10 Measuring scale Target 2 shall contain two straight lines for use as measuring scales. The horizontal line shall start in column 6, row 29. The length of the line shall be such that the length of the e
41、quivalent line on the microimage shall be 6,35 mm. Where multiple reduction ratios can be used, marks shall be made on the line such that the length of the relevant part of the line on the microimage from the start point shall be 6,35 mm. The relevant reduction ratios (such as 1:24, 1:48) shall be i
42、ndicated on the test target. The vertical line shall start in column 27, row 65. The length of the line shall be such that the length of the equivalent line on the microimage at 1:24 shall be 6,35 mm. Where multiple reduction ratios can be used, marks shall be made on the line such that the length o
43、f the relevant part of the line on the microimage from the start point shall be 6,35 mm. Where 1:48 reduction ratio is available, the mark will be such that the length of the relevant part of the line on the microimage from the start point shall be 3,18 mm. The vertical line shall be broken so that
44、it does not run through the density measuring areas or the horizontal scale. The breaks shall be at least one row below the density measuring area enclosure box and at least half a row above the horizontal scale. 4.11 Title area An area from row 3 to row 14 and from column 32 to column 102 shall be
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