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1、- bIS XX9004 83 W 4933b08 0073953 b I UDC 003.054 : 681.327.12 5 J . . . . JAPANESE INDUSTRIAL STANDARD Printing Specifications for Optical Character e Recognition Japanese Standards Association Printed in Japan -A- 17 S Copyright Japanese Standards Association Provided by IHS under license with JSA
2、Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:21:42 MDTNo reproduction or networking permitted without license from IHS -,-,- h ,LIS X*9004 83 4933b08 0073954 8 I . . In the event of any doubt arising, the original Standard in Japanese is to be final authority. C
3、opyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:21:42 MDTNo reproduction or networking permitted without license from IHS -,-,- 2. Definitions .IS Xk9004 83 W 4933bO 0073955 T ! UDC 003.0
4、54:681.327.12 JAPANESE INDUSTRIAL STANDARD J I S Printing Specifications for Optical Character Recognition X 9004-1983 1. Scope This Japanese Industrial Standard specifies the following prescriptions for printing the set of characters to be used for optical character recogni- tion, hereinafter refer
5、red to as the “OCR“. Here, “characters“ shall be as defined in JIS X 9001 and JIS X 9003, - (i) Optical characteristics of the paper to be used. (2) Optical and dimensional characteristics of printed individual OCR characters. Basic specifications for the position of OCR characters printed on docume
6、nts. (3) The definitions of main terms used in. this Standard shall be as follows: (3) (4) document An input medium to OCR. spectral bands optical characteristics of OCR paper, ink and printed image. There are severa1 spectral bands ranging from near ultraviolet to near infrared wavelengths. reflect
7、ance measured matter and the perfect reflecting diffuser( l ) both of which are set under the same optical conditions. Note ( l ) Spectral wavelength ranges provided to specify The ratio of reflected quantity of light from the In the measurement, a white plate is employed as the white standard, for
8、which, in practice, barium sul- fate (BasOb) and others are used. A portion in the paper used with a reflectance of remark- stain ably lower than its circumference. Applicable Standards : JIS X 9001-Alphanumeric Character Sets for Optical Recognition . JIS X 9003-KATAKANA Character Set for Optical R
9、ecognition Corresponding International Standard : IS0 1831-1980 Printing Specifications for Optical Character Recognition Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:21:42 MDTNo repr
10、oduction or networking permitted without license from IHS -,-,- J I S X * O O 4 8 3 m 4933608 0073956 L A 2 X 9004-1983 backing method reflectance and opacity of the paper, A method used at the time of measuring the A sufficient backing method is a method by which, when the measuring sample is backe
11、d with sheets of paper of the same quality, the change of measured value is no more recognized even if the number of sheets of paper is further doubled. black backing method is a method using a black plate of reflect- ance 0.5 % or under for backing the sample. A printed image with the surrounding b
12、lank spaces of the document. A pattern formed by printed characters together stroke an individual character. A segment of line with a certain thickness that comprises - centre line standard character. Centre line of the stroke forming the frame of a range Grade of tolerance limits of print quality.
13、Three kinds Y and 2 are provided. COL (Character Outline Limits) limits for the deviation from standard stroke width. The maximum COL indicates the maximum limit and the minimum COL indicates the minimum limit. Outline indicating the tolerance COL gauge of printed image. Maximum COL, minimum COL and
14、 the centre line character sets are indicated on a gauge. The gauge to measure the dimensional characteristics cutoff is asymmetrically lacking. printing equipment. A state in which part of stroke at one side of character - This is apt to occur in the high speed limit line of cutoff on cutoff. Borde
15、r line indicating the limit of tolerances This exists only in COL gauge for range Z. cutoff centre line Segment of line formed by the locus of the centres of circles circumscribed between the limit line of cutoff and the minimum COL. This is used in place of the centre line in the measurement of pri
16、nted image accompanied by a cutoff. best fit image adjusted so as to make the character fill up the inside of the minimum COL as much as possible and at the same time bulge out of the maximum COL as little as possible. Relative position of COL gauge and the character 7 PCS (Print Contrast Signal) co
17、ntrast between the paper and the printed images. basic PCS COL in one character. surement of printed images. A value expressing the optical A series of PCS measured along the centre line of This is used for the instrumental mea- PCS 80 8 of PCS values measured on the centre line of COL. The smallest
18、 values out of the selected larger 80 % Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:21:42 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS X*9004 83 4733
19、608 0073957 3 E 1 3 X 9004-1983 (29) (33) (34) .a (35) contrast variation ratio tion and the lightest portion of ink density in characters as measured on the centre line of COL. - void remaining parts of characters within the minimum COL, Ratio of PCS value for the darkest por- A portion with reflec
20、tance evidently higher than the stroke edge ground part, Border line between the stroke part and the back irregularities of stroke edge intrude into the minimum COL or extrude from maximum COL. The parts where the stroke edges spot evidently lower than the background. subject area of inspection char
21、acteristics of a printed image. a character and the bIank spaces surrounding it. A portion outside the maximum COL with reflectance Range of measurement for optical A rectangular area including reference edge of documents reference of printing position, The edge of documents as the character territo
22、ry parallel to the reference edge of documents and which includes al1 strokes of one character inside it. The smallest rectangle of which one edge is line territory parallel to the reference edge of documents, and which includes all character territories situated on the line. character separation ce
23、nt character territories within the same line territory. The smallest rectangle of which one edge is . The horizontal distance between two adja- character spacing Horizontal distance between the perpendicular bisectors of two adjacent character territories within the same line territory. character a
24、lignment Perpendicular distance between the base lines of two adjacent character territories within the same line territory. printing area edge is parallel to the reference side of documents set up for A predetermined area of rectangle of which one printing one set of recognition subject characters
25、on one line. clear area the reference edge .of documents and which includes the printing area and its circumferential blank spaces. margin from edge Distance from each edge of documents to the printing area. A rectangular area of which one edge is parallel to line separation utive line territories.
26、Perpendicular distance between the two consec- line spacin d two consecutive line territories. Perpendicular distance between the perpendicular Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/20
27、07 21:21:42 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S X*9004 83 W 4933688 0073958 5 m 4 X 9004-1983 3. Spectral Bands The spectral bands shall be as shown in Table 1. Table 1. Spectral Bands Unit: nm Nomination B425 B460 B 490 B 530 B 570 B 620 B 680 B900 Peak 4
28、25f 5 460 f 5 490 f 5 530 f 5 570 f 10 620 f 10 680 f 10 900 f 50 Band width at 50 % level 50 or less 60 or less 60 or less 60 or less 100 or less 100 or less 120 or less 400 or less Remarks 1. Table 1 shows the general characteristics of the light source, filter and light-receiving device. These sp
29、ectral characteristic curves of each band shall be smooth and of single hump. Total sum of the magni?tude of energy distribu- tion within the range of wavelength under 400 m shall be within 5 % of the energy within the subject frequency area for measurement, 2. 3. 4. Characteristics of Paper for OCR
30、 4.1 Optical Requirements for OCR Paper The papers used for OCR documents shall satisfy the following requirements in order to provide high contrast and uniform reflectance to the subject characters for recognition. (1) Shall have white colour, high opacity, high reflectance and low luster. (2) Shal
31、l be finished flat and free form irregular composition and stains. (3) Shall have no watermark printing or mixture of colouring agent or fluorescent substance. 4.2 Opacity of Paper 4.2.1 Opacity Opacity ( C ) shall be defined as follows: c=-xlOO(%) R B RI where R,: reflectance of paper measured with
32、 the black backing method R I : reflectance of paper measured with the sufficient backing method Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:21:42 MDTNo reproduction or networking pe
33、rmitted without license from IHS -,-,- J I S X*9004 83 E 4933608 0073959 7 E - Grade High opacity paper Medium opacity paper a Opacity 85 % or over 70 % or over 5 X 9004-1983 B 425 B 530, B 570 or one having peak between these and band width within 100 nm. B 900 Remarks 1. Measurement shall be carri
34、ed out for both of the surface and the back. exists, both values shall be adopted. When the difference of 0.5 % or more 60 % or over 50 % or over 70 % or over 60 % or over .70 % or over 60 % or over . 2. Measurement shall be conducted in accordance with the spectral band given in Table i. 4.2.2 Grad
35、e of Opacity Grades of opacity shall be as given in Table 2. Table 2. Grade of Opacity Q I B) 4.3 Reflection Characteristics of Paper 4.3.1 Reflectance of Paper Reflectance of paper shall be as given in Table 3. Table 3. Reflectance of Paper I 1 I ber Numl - 1 2 3 - Spectral band High opacity Remark
36、s 1. For normal white paper, measurement may be carried out for two classes of spectral band correspondingto No. 1 and No. 2, Measurement with No. 3 shall be carried out only when confusion in the reflection of infrared lights is antic- ipated. However, particular strictness is required for the . sp
37、ectral characteristics, measurement shall be performed for all spectral bands given in Table 1. Measurement shall be made by the black backing method. 2. 4,3.2 Uniformity of Reflectance Variation of reflectance on the same paper face shall be as given in Table 4. Copyright Japanese Standards Associa
38、tion Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:21:42 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S X*K1004 83 4933688 0073960 3 Standard variation/mean value of reflectance Grade High opa
39、city paper Medium opacity paper Within 3.5 % Within 5. O % 6 X 9004-1983 Maximum reflectance/ minimum reflectance 1.2 or under Table 4. Variation of Reflectance Dimension of stain Specified value Specified condition 2. Spectral band shall comply with Table 3. that the strictest spectral band is appa
40、rent, measurement may be carried out with only that spectral band, However, in case Diameter 0.10 mm or over 3. Sufficient number of sample points shall be selected without bias and inclination so as to ensure reproducibility of measure- ment results. 250 points/m2 Or under Mean value of 20 sheet sa
41、mples shall satisfy 4.3.3 Stain in Paper However, only when the measurement of stains with Table 5 fs Stains in paper shall be dealt with as shown in Table 5. impossible, Table 6 may be applied. 6.0 m2 0.10 m x 0.10 m Table 5. Stain in Paper Total number of sec- tions with stains: 200 or under be ma
42、de for 1 min per section. Under the bright indirect illumination, visual inspection from 0.5 m distance shall 19 out of 20 sheet samples shall satisfy the specified value. Diameter 0.20 mm or over I I Remark: Dimension of sample should preferably be about 1 m2, and shall not be 0,125 m2(A 3 equivale
43、nt) or under. Table 6. Simple Inspection of Stain I l n s i o n I Specified value Dimension of 1 section I Inspection condition 5 . Characteristics of Printed Image 5.1 Requirements for Securing Print Quality The print quality shall satisfy the following requirements: (1) The printed character shall
44、 possess as high a contrast as possi- ble to the document as background. (2) Stroke width shall be as close the standard value as possible. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 2
45、1:21:42 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS X*9004 83 m 4933608 00739b3 5 m St andard width(*) Font I Size I stroke OCR-A, B, K I o. 35 I m O. 38 OCR-A O. 51 OCR-B O. 50 OCR-A, B nr 7 X 9004-1983 (3) Voids shall not exist inside the stroke outline. cannot be
46、 observed, the number and size of voids shall be mini- mized and the distance between them maximized. When this rule Range X Ranges Y, Z &O. 08 &O. 15 I O . 08 20.18 &O. 13 2 0 . 25 (4) Spots must not exist within the clear area, When this cannot be avoided, the number and size of spots must be mini
47、mized and the distance between them must be as large as possible. (5) Stroke centre lines of the printed image shall be as near to the . standard centre line image as possible. 4 5.2 Ranges 5.2.1 Classification of Ranges Print quality shall be classified into the following three ranges according to
48、the degree of tolerance on print quality. (i) (2) Range X (High print quality) Range Y (Medium print quality) . (3) Range Z (Low print quality) . Remark: In case a set of characters include small characters of KATAKANA, small English letters, and symbols #, %, , range X shall be applied. 5.2.2 Applicable Scope of Range Z Range Z may be applied only for the following case: (i) (2)- Only the characters included in the numeral subset specified in 6. of JIS X 9001 are objects of recognition. Printed images are to be measured