1、INTERNATIONAL STANDARD 1073/l INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .ME;KJIYHAPOLIHAI OPrAHM3AUMR no CTAHLIAPTI13AUMR.ORGANISATION INTERNATIONALE DE NORMALISATION Alphanumeric character sets for optical recognition - Part I : Character set OCR-A - Shapes and dimensions of the printed image
2、Jeux alphanumkriques de caractkes pour la reconnaissance optique - Partie I : Jeu de caractgres ROC-A - Formes et totes de Iimage imprimke First edition - 1976-12-01 Corrected and reprinted - 1979-05-15 UDC 681.3.048 : 655.24 Ref. No. IS0 1073/l-1976 (E) L -65 Descriptors : data processing, optical
3、recognition, alphanumeric character sets, OCR-A character sets, specifications, dimensions. s Price based on 26 pages Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date of ANSI Approval: 1/11/99Published by American National Standar
4、ds Institute,25 West 43rd Street, New York, New York 10036Copyright 2002 by Information Technology Industry Council (ITI).All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO), InternationalElectrotechnical Commission (IEC), American
5、National Standards Institute (ANSI), and Information Technology Industry Council(ITI). Not for resale. No part of this publication may be reproduced in any form, including an electronic retrieval system, withoutthe prior written permission of ITI. All requests pertaining to this standard should be s
6、ubmitted to ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaFOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 Member Bodies). The work of developing International Standards is carried
7、out through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up 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. Draft In
8、ternational Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 1073/l was drawn up by Technical Committee lSO/TC 97, Computers and information processing, and
9、 was circulated to the Member Bodies in May 1975. It has been approved by the Member Bodies of the following countries : Belgium Japan Czechoslovakia Netherlands France New Zealand Germany Romania Hungary South Africa, Rep. of Italy Switzerland Turkey United Kingdom U.S.A. U.S.S.R. Yugoslavia The Me
10、mber Body of the following country expressed disapproval of the document on technical grounds : Brazil This International Standard, together with IS0 1073/ll, cancels and replaces IS0 Recommendation R 1073-l 969. 0 International Oqanization for Standardization, 1976 l Printed in Switzerland INTERNAT
11、IONAL STANDARD IS0 107311-1976 (E) Alphanumeric character sets for optical recognition - Part I : Character set OCR-A - Shapes and dimensions of the printed image 1 GENERAL 1.1 Scope This International Standard for character shapes and sizes is intended to facilitate and foster the use of Optical Ch
12、aracter Recognition (OCR) in data processing, by defining character shapes suitable for both human and machine reading. It establishes a common basis for printing equipment and optical scanning equipment for OCR interchange appli- cations. Additional International Standards will cover the print qual
13、ity and the relevant characteristics of the formats needed to satisfy interchange requirements. 1.2 Field of application This International Standard specifies the printed image shapes and sizes of alphanumeric characters, graphics and symbols designed for use in Optical Character Recognition. They a
14、re also suitable for general purposes. In order to satisfy present requirements and encourage the wide extension of OCR applications, two sets of characters are specified. These are named OCR-A and OCR-B. Character set OCR-A includes the numeric sub-set which was recommended in draft IS0 Recommendat
15、ion No. 890 (now part of this International Standard). The shapes of the characters have been designed to be suitable for use in many applications of OCR. Dimensions of OCR-A are given in three sizes. The shapes of the OCR-B characters have been designed for use in OCR systems without undue sacrific
16、e of their suit- ability for general purposes in a wide range of applications. Dimensions of OCR-B are given in three sizes. (See part II.) 1.3 Definitions For the purpose of this International Standard the follow- ing definitions apply : 1.3.1 OCR-A : A repertoire of-69 characters of which 56 are g
17、raphics included in the IS0 7-bit coded character set (IS0 646-1973). It comprises digits, capital letters, capital national letters and other graphics. 1.3.2 OCR-B : A repertoire of 121 characters comprising digits, capital and small letters, all the graphics specified in the IS0 7-bit coded charac
18、ter set (IS0 646-1973). national letters, diacritical signs and further graphics. (See part Il.) 1.3.3 printing frame : The smallest rectangle the sides of which are horizontal and vertical and which includes the centreline shapes of all characters with the exception of long vertical mark. 1.3.4 siz
19、es of a repertoire : The sizes specified by the height H and the width W of the relevant printing frame. NOTES 1 Three sets of sizes are specified in order to permit the use of the OCR character sets with a wide range of printing equipment with different print quality characteristics. Devices such a
20、s typewriters, cash registers, numbering machines, high-speed printers, credit card imprinters and non-impact imprinters, and printing processes such as letterpress and offset, are all involved. 2 For applications which involve circulation of documents across boundaries between areas in which differ
21、ent national characters are in use, agreement between the sender and the recipient of the documents is required. 3 The metric and inch dimensions in this International Standard are rounded and therefore consistent but not exactly equal. Either system may be used but the two should not be intermixed.
22、 4 It is recognized that some type-making and printing processes will not be able to produce sharp corners. Corners not specified as having a specific radius should be as sharp as practicable. However, it is not necessary for OCR purposes that the radii of the corners of the nominal printed image be
23、 less than 0,08 mm (0.003 5 in). 5 All OCR-A characters are designed to be free-standing individual characters, and therefore are not intended for dual use with (or as) diacritical marks in OCR applications. 2 CHARACTER SET OCR-A 2.1 Name The name of the character set is OCR-A. 2.2 OCR-A sizes Table
24、 1 below specifies the dimensions of the printing frame (W,H) of the total repertoire in three sizes. It also indicates the nominal strokewidth T and the minimum length L of the long vertical mark (14 H/9). The maximum length of the vertical mark is not specified as there is no intention of restrict
25、ing it. ISO 1073/I-1976 E) 2.3 OCR-A repertoire 2.3.1 The 69 characters of the OCR-A repertoire are as follows (see also 2.5) : 10 digits 0 to 9 26 capital letters A to Z 17 graphics -c =+/$*“&I H?sYdI- 4 USE OF THE TABLE OF VALUES (Table 3) 4.1 Table 3 specifies in both millimetres and inches the d
26、imensions for each character in each of the three sizes I, III and IV. 4.2 Table 3 lists character height, width and stroke dimen- sions based on - the height H of the printing frame, - the width Wof the printing frame, - the nominal strokewidth T. 4.3 Table 3 also lists, as items rl to re, the valu
27、es of the centreline radii specified for use in the characters listed in table 2. The formulae for calculation of rl to re are given on page 5. TABLE 2 - Radii Character 0 and 0 Q S ij Radius rl r2 r3 r4 r5 r6 5 RADII AND CORNERS All radii specified for the OCR-A characters are given on the drawings
28、 and in table 3. All edges should be blended, with rounded corners. 3 IS0 1073/l-1976 (E) TABLE 3 - OCR-A values H 2,400 3,200 3,800 0.094 0 0.126 0 0.150 0 W 1,400 1,520 2,040 0.055 0 0.060 0 0.080 0 T 0,350 0,380 0,510 0.0140 0.015 0 0.020 0 112 T 0,175 0,190 0,255 0.007 0 0.007 5 0.010 0 312 T 0,
29、525 0,570 0,765 0.021 0 0.022 5 0.030 0 2T 0.700 0,760 1,020 0.028 0 0.030 0 0.040 0 118 W 0,175 0,190 0,255 0.006 9 0.007 5 0.0100 114W 0,350 0,380 0,510 0.0138 0.0150 0.020 0 318 W 0,525 0,570 0.765 0.020 6 0.022 5 0.030 0 7116 w 0,612 0,665 0892 0.024 1 0.026 3 0.035 0 112 w 0,700 0.760 1,020 0.0
30、27 5 0.030 0 0.040 0 9116 W 0,788 0,855 1,148 0.030 9 0.033 8 0.045 0 518 W 0,875 0,950 1,275 0.034 4 0.037 5 0.050 0 314 w 1,050 1,140 1,530 0.0413 0.045 0 0.060 0 l/l6 H 0,150 0,200 0,238 0.005 9 0.007 9 0.009 4 ll8H 0.300 0.400 0.475 0.011 8 0.0158 0.0188 3116 H 0,450 0,600 0,713 0.017 6 0.023 6
31、0.028 1 ll4H 0,600 0,800 0,950 0.023 5 0.031 5 0.037 5 9132 H 0,675 0,900 1,069 0.026 4 0.035 4 0.042 2 5116 H 0.750 l.Of)O 1,188 0.029 4 0.039 4 0.046 9 318 H 0,900 1,200 1,425 0.035 3 0.047 3 0.056 3 7116 H 1,050 1,400 1,663 0.0411 0.055 1 0.065 6 l/2 H 1,200 1,600 1,900 0.047 0 0.063 0 0.075 0 17
32、132 H 1,275 1,700 2,019 0.049 9 0.066 9 0.079 7 9116 H 1,350 1,800 2,138 0.052 9 0.070 9 0.084 4 518 H 1,500 2,000 2,375 0.058 8 0.0788 0.093 8 lll16H 1,650 2,200 2,613 0.064 6 0.086 6 0.103 1 314 H 1,800 2,400 2,850 0.070 5 0.094 5 0.1125 13116 H 1,950 2,600 3,088 0.076 4 0.1024 0.121 9 718 H 2,100
33、 2,800 3,325 0.082 3 0.1103 0.131 3 15116 H 2,250 3,000 3,563 0.088 1 0.118 1 0.140 6 1 0.635 1,022 1,084 0.024 8 0.040 1 0.043 1 2 0,283 0,283 0,398 0.011 1 0.011 2 0.015 6 3 0,255 0,266 0,366 0.0100 0.0105 0.0143 4 0,223 0,310 0,360 0.008 7 0.012 2 0.0142 r5 0,476 0.755 0.807 0.0186 0.029 7 0.032
34、0 6 0,336 0,327 0,468 0.0132 0.012 9 0.018 3 L 3.7 5.0 5.9 0.146 0.196 0.233 T I millimetres Ill T IV I inches III 1 IV IS0 1073/l -1976 (E) FORMULAE FOR CENTRELINE RADII rl to r6 6 RELATIVE VERTICAL POSITION OF PRINTED CHARACTERS 6.1 Base line The base line is a horizontal line used to specify the
35、nominal vertical position of characters printed in the same line of text. The position of the base line is indicated on the draw- ings of all characters (except for the long vertical mark). 6.2 Base line displacement The base line displacement, Y, of each character is the shortest distance between t
36、he base line and the centreline of that character. This value is indicated on the drawings of all characters for which it is not zero. 6.3 Vertical position The nominal vertical position of characters printed in the same line of text is such that the base lines of all characters should be aligned. 7
37、 RELATIVE HORIZONTAL POSITION OF PRINTED CHARACTERS 7.1 Reference line for the horizontal location of any character The horizontal location reference line of a character is perpendicular to the base line and divides the printing frame of that character equally. This line is indicated on each drawing
38、. 7.2 Horizontal position In constant pitch printing, the distance between horizontal location reference lines of adjacent characters should be uniform. * Radii for 0 only. 5 IS0 1073/l-1976 (E) H- (4 -i - - - + - - - - - - Y8H - - - - - -T 0.0 -Lrpp-T- 1 I I 0.0 v2w W c H- %?SYti /ET-q UiX0dRAfY SIZE IV ABCDEFGHIJKLM NOPQRSTLJVWXYZ 0323456787
