ANSI INCITS 17-1981 Character Set for Optical Character Recognition (OCR-A).pdf

1、Chap Chap kNSI INCITS 17-1981 (R2000) (formerly ANSI X3.17- 198 1 (R2000) ADOPTED FOR USE BY THE FEDERAL GOVERNMENT WA- b PUB 32-1 SEE NOTICE ON INSIDE aacter Set for Optical aacter Recognition (OCR-A) De SM Where IT all begins This standard has been adopted for Federal Government use. Details conce

2、rning its use within the Federal Government are contained in FIPS PUB 32-1, Character Sets for Optical Character Recognition (OCR). For a com- plete list of the publications available in the Federal Information Processing Standards series, write to the Standards Processing Coordinator, Institute for

3、 Computer Sciences and Technology, National Bureau of Standards, Washington, D.C. 20234. ANSI X3.17-1981 Revision of ANSI X3.17-1977 American National Standard Character Set for Optical Character Recognition (OCR-A) Secretariat Computer and Business Equipment Manufacturers Association Approved June

4、16, 1981 American National Standards institute, inc Abstract This standard provides the description, scope, and identification for a set of graphic shapes to be used in the application of optical character recognition (OCR) systems. The style is desig- nated OCR-A and comprises 96 graphic shapes, pl

5、us the Character Space. OCR-A was designed to provide maximum machine efficiency under a wide range of applications. Three sizes of graphic shapes are provided - I, I Il, and IV (I I is reserved for certain international applications). In addition to graphic shapes and related information, the stand

6、ard provides basic requirements related to character positioning and the ASCII code table Key words: optical character recognition, OCR, OCR-A, graphic shapes, character positioning, data entry, machine reading. Approval of an American National Standard requires review by ANSI that the requirements

7、for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement mean

8、s much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect prec

9、lude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation

10、of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name app

11、ears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of Americ

12、an National Standards may receive current information on all standards by calling or writing the American National Standards Institute. American National Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright O1 981 by Information Technology Indust

13、ry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of America Foreword (This Foreword is not a

14、 part of Amencan National Standard Character Set for Optical Character Recognition (OCR-A), ANSI X3.17-1981.) This standard presents an alphanumeric character set for use in optical character recognition (OCR) systems. The character set contains 96 printing characters plus the Character Space, and i

15、ncludes digits, letters, small letters, and special symbols. Two editing characters, Character Erase and Group Erase, are also included. Alternate shapes are provided for the Period, Comma, Question Mark, Hyphen (Minus Sign), and the Apostrophe to improve performance in some printing devices and to

16、improve recognition. The character set includes an OCR representation for all 96 characters in American National Standard Code for Information Interchange (ASCII), ANSI X3.4-1977. No graphic shapes were developed for the ASCII characters Tilde, Underline, and Grave Accent, since any need for these g

17、raphics could be represented in their respective code positions by the Hook, Fork, and Chair (if required in an information interchange application). The character set repertoire and character shape specifications in this standard are identical to those contained in American National Standard Charac

18、ter Set and Print Quality for Optical Character Recognition (OCR-A), ANSI X3.17-1977. This standard, containing only character shapes and their nominal position, is a refinement of and supersedes ANSI X3.17-1977. Speci- fications for character positioning are contained in American National Standard

19、for Optical Character Recognition (OCR) Character Positioning, ANSI X3.93M-1981. The OCR-A character set for optical character recognition was first developed in the United States in 1961 as a numeric font only. In 1966 an alphanumeric font which contained 57 char- acters, including the existing num

20、eric font, 4 abstract characters, and only capital letters, was issued. The revised standard was entitled American National Standard Character Set for Optical Character Recognition, ANSI X3.17-1966. A revised edition was published in 1974, as American National Standard Character Set and Print Qualit

21、y for Optical Character Recognition (OCR-A), ANSI X3.17-1974. It contained an en- larged repertoire of 86 characters by including the small letter alphabet and 3 new characters, Character Space, Character Erase, and Group Erase. Also, 5 alternate characters to improve printing and readability of the

22、 Period, Comma, Question Mark, Apostrophe, and Hyphen were added. Specifications for spectral bands, paper, character positioning, and print quality were expanded. The OCR-A standard was revised in 1977 to enlarge the character set repertoire to 97 standard characters by the addition of 11 new chara

23、cters. All OCR characters were assigned positions in the ASCII code table. This revised edition was issued as ANSI X3.17-1977. Other standards of interest in this field are published by the International Organization for Standardization (ISO) as International Standard IS0 1073/I-1976, Alphabetic cha

24、racter sets for optical recognition - Part I: Character set OCR-A - Shapes and dimensions of the printed image, and IS0 1073/11-1976, Alphanumeric character sets for optical recognition - Part II: Character set OCR-B - Shapes and dimensions of the printed image. The character shapes speci- fied in I

25、S0 1073/I-1976 are identical to those in this American National Standard, including the 9 national letters and currency symbols shown in Appendix B. However the small letters and the 11 new characters which were added to ANSI X3.17-1977 are not included in the IS0 Publi- cation. (For availability of

26、 copies of IS0 standards, see footnote 4, Appendix B of this standard). This present standard is one of a series covering such topics as character shapes, paper, inks, forms, print quality, and character positioning. It prescribes the shapes and sizes of one style of characters to be used in optical

27、 character recognition (OCR) in keeping with the practice fol- lowed in American National Standard Character Set for Optical Character Recognition (OCR-B), ANSI X3.49-1975, and in international practice. Suggestions for improvement of this standard will be welcome. They should be sent to the America

28、n National Standards Institute. 1430 Broadwav. New York. N.Y. inn1 8 This standard was processed and approved for submittal to ANSI by American National Stan- dards Committee on Information Processing, X3. Committee approval of the standard does not necessarily imply that all committee members voted

29、 for approval. At the time it approved this standard, the X3 Committee had the following members: John F. Auwaerter, Chairman J. P. Ancona, ViceChairman John A. N. Lee, Vice-chairman Catherine A. Kachunk, Secretary Organization Represented Name of Representative American Bankers Association . Andrew

30、 Ernst Arthur Miller (Ait) A. B. Dick Company. O. Northstrum American Express Company. R. S. Newman Richard Hicks Ai0 AmericanNuclearSociety. . American Society for Information Science AMPInc Association of American Railroads. Association of Computer Users . Association for Computing Machinery . Ass

31、ociation for Systems Management . Burroughs Corporation. . Computer and Communications Industry Association Control Data Corporation Data General Corporation Data Processing Management Association . Digitai Equipment Computer Users Society. Digital Equipment Corporation. Edison Electric Institute. G

32、eneral Services Administration GUIDE international. Hamscorporation Hewlett Packard. . Honeywell Information Systems IBMCoIporation . IEEE Communications Society . IEEE Computer Society . Lawrence Berkeley Laboratory . Geraldine C. Main D. R. Vondy (Ait) Charles Goldstein Patrick E. Lannan C. Brill

33、(Ait) R A. Petrash Hiilel Segal Thomas M. Kurihara (Ait) John A. N. Lee Pat Skeiy (Ait) Wallace R. McPherson, JI Richard Irwin (Ait) Michael J. Bedford Jerrold S. Foley (Ait) Norman J. Ream A. G. W. Biddle (Ait) Charles E. Cooper Keith Lucke (Alt) Anthony M. Goschaik Jit Saxena (Ait) Ardyn E. Dubnow

34、 Steve Jost (Ait) John R. Barr James Hodges (Ait) Patricia W. White Howard Kakow (Ait) S. P. Shrivastava William C. Rinehuls Donald J. Page (Ait) Frank Kirshenbaum Leland Muiiigan (Ait) Richard Joyce Ed Younker (Alt) Donald C. Loughry Thomas J. McNamara Eric H. Clamons (Ait) Mary Anne Gray William C

35、. McCleliand (Ait) Thomas A. Varetoni Herbert Hecht Robert S. Stewart (Ait) James A. Baker D. F. Stevens (Ait) Life Office Management Association. . Richard E. Ricketts James F. Foley, JI (Alt) Moore Business Forms D. H. Oddy National Bureau of Standards. . Robert E. Rountree James H. Burrows (Ait)

36、National Communications System . Marshall L. Cain George W. White (Ait) Organization Represented Name of Representative Frank Malabaraba (Alt) Helen Wright (Alt) Wiiiiam E. Snyder (Alt) OCR Users Association. . Herbert F. Schantz G. W. Wetze1 (Alt) Ohio College Library Center, Inc David Colombo Davi

37、d Penniman (Alt) Perkin-Elmer Corporation David Eliis David Saunders (Alt) Prime Computer. . Winfried Burke Charles Tinkey (Alt) Printing Industries of America. . Michael Nolan Norman Scharpf Recognition Equipment, Inc. Leonard J. Nunley Larry E. Resch (Alt) SHARE, Inc. . ThomasB. Steel, JI Daniel S

38、chuster (Alt) Society of Certified Data Processors Thomas M. Kurihara Ardyn E. Dubnow (Alt) Sperry Univac . Marvin W. Bass Charles D. Card (Alt) The Standard Register Company F. V. Parenti R R. Weeks (Alt) Telephone Group . Robert Mercer R. M. Shaw (Alt) S. M. Garland (Alt) National Micrographics As

39、sociation. William E. Neale Nationai Secretaries Association P. E. Peace NCR Corporation. Thomas W. Kern 3MCompany . R.C.Smith U.S. Department of Agriculture. G. Kent Godwin US. Department of Defense. Wiiliam LaPlant VIM . WaldoM.Wede1 Wang Laboratories, Inc. . Carl W. Schwarcz Charles McComas (Alt)

40、 Xerox Corporation John L. Wheeler Arthur R. Machell (Alt) Subcommittee X3A1 on Optical Character Recognition, which developed this standard, had the following members at that time: G. K. Godwin, Chairman H. F. Schantz, Vice-chairman C. P. Newman, Secretary R. Aubey T. Bagg W. Biings C. Biss R Bloss

41、 G. Brown J. Brown M. Burns K. Bye L. Cassa F. Cicha B. Daniels W. Davidson J. DeSautels R Easiey R Faulkner J. Forsythe W. Foster J. Freymeyer B. Frost D. Gibson R. Green R. Heathcoe E. Henrichon M. Hirsch W. Holmes J. Hopkins R. Ireland T. Janning W. Kirkner C. Knoedel G. Koneniewski H. Kruser F.

42、Lewandowski H. Lidkea J. McDonnell S. McIntosh R Mestler J. Miller R. Monell D. Newton R. Norlund D. Oddy T. Peder L. Richards G. Robertson D. Rosenberg J. Rosenblum N. Selke J. Sicard B. Smith R Smith P. Traglia N. Weiland J. Welk B. Witty Technical responsibility for the development of this standa

43、rd was assigned to X3A1 Working Group A on Character Sets and Shapes. During the development period this technical subcom- mittee had the following members: P. J. Traglia, Chairman R. C. Bloss, Secretary G. Brown J. Brown C. Biss B. Daniels J. DeSautels R. Easley R. Fauikner W. Foster G. K. Godwin J

44、. Hopkins R. Ireland G. Korzeniewski H. Lidkea J. McDonnell R. Monel G. Robertson J. Rosenblum H. Schantz N. Wieland B. Witty Special appreciation is extended to the National Bureau of Standards Instrument Shops for correcting the masters to reflect a correct centerline drafting notation. In particu

45、lar, special appreciation is extended to Tom Bagg of that organization. Other persons who contributed to the development of this standard were: J. P. Ancona L. M. Andrews A. J. Atrubin P. E. Baetz D. Bates T. Baudin W. C. Billings K. Bol A. C. Brown M. W. Burris R. Cossaboon J. L. Crawford H. Currie

46、 J. Demasi W. A. Dickerson, Sr C. Eliot H. S. Fitch J. A. Fitzmorris J. J. Forsythe D. Freedman J. H. Freymeyer R. M. Fricano R. Gocht J. Goldberg R. Goulet R. Griffith B. Gustina A. Hamburgen E. Henrichon M. Hirsch W. E. Holmes R. Ireland C. Jones A. M. Kaeder R. Kroiak H. W. Kruser H. A. Lange, Jr

47、 S. Lanzatella J. J. Leimer S. McIntosh A. L. Minto W. Muldowney T. Peder R. Reynolds L. Richards J. Rosenblum H. F. Schantz W. Schmidt J. Seeley H. W. Silsby T. W. Turner J. Walkley J. A. Warme R. Worral R. Zablocki PAGE 1 . General 10 Contents 1.1 Scope 10 1.2 Purpose . 10 1.3 Application 10 2 . S

48、tandard Characters 10 2.1 Character Shapes . 10 2.2 Character Sizes 10 2.3 Character Repertoire 10 2.4 Properties of Special Characters . 11 2.5 Relative Character Positioning 12 Table 1 OCR Character Dimensions, and Formulas for Radii r1+6 . Table 2 Nominal Character Sizes and Stroke Width Toleranc

49、es . Fig . 1 Digit One . 15 Fig.2 DigitTwo . 15 Fig . 3 Digit Three 15 Fig . 4 Digit Four . 15 Fig . 5 Digit Five . 16 Fig . 6 Digit Six . 16 Fig . 7 Digit Seven 16 Fig . 8 Digit Eight 16 Fig.9 DigitNine . 17 Fig . 10 Digit Zero . 17 Fig . 11 SymbolHook 17 Fig . 12 Symbol Fork . 17 Fig.13 Symbolchair 18 Fig . 14 LongverticalMark . 18 Fig . 15 Letter A 18 Fig . 16 LetterB 18 Fig . 17 LetterC 19 Fig . 18 LetterD 19 Fig . 19 LetterE 19 Fig . 20 Letter F 19 Fig . 21 Letter G . 20 Fig.22 Letter H 20 Fig.23 Letter I 20 Fig . 24 Letter J 20 Fig . 25 Letter K 21 Fig . 26 Letter L 21 Fig.27 Let