1、 IEC 62875 Edition 1.0 2015-02 INTERNATIONAL STANDARD Multimedia systems and equipment Multimedia e-publishing and e-book technologies Printing specification of texture map for auditory presentation of printed texts IEC 62875:2015-02(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyrigh
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11、 and equipment Multimedia e-publishing and e-book technologies Printing specification of texture map for auditory presentation of printed texts INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.160 ISBN 978-2-8322-2271-3 Registered trademark of the International Electrotechnical Commission Warning! M
12、ake sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 62875:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative reference 5 3 Terms and definitions 5 4 Printing specification . 6 4.1 General . 6 4.2 Size of a texture map 6 4.3 Printing quality of a tex
13、ture map 6 4.3.1 Printing quality . 6 4.3.2 Sampling line . 7 4.3.3 Quality measure 8 4.4 Location of a texture map 11 4.5 Location of a notch . 11 Annex A (informative) Examples of visible quality of a texture map 13 Annex B (informative) Creating process of printed matter including a texture map .
14、 15 Figure 1 Sampling lines in case of size M texture map . 7 Figure 2 Reflectance pattern of cells on scanning the sampling lines . 8 Figure 3 Length between end points of tick marks on a horizontal sampling line 9 Figure 4 Location of a texture map . 11 Figure 5 Location of a single notch 12 Figur
15、e 6 Location of double notches 12 Figure A.1 Texture map with high printing quality . 13 Figure A.2 Texture map including low contrast cells and non-square cells 13 Figure A.3 Texture map with low sharpness . 14 Figure A.4 Texture map processed by non-preserving data compression . 14 Figure B.1 Crea
16、ting process of printed matter including a texture map . 15 Table 1 Sizes of a texture map . 6 Table 2 Printing quality of a texture map 7 Table 3 Value of print contrast . 8 Table 4 Value of symmetry of cell pattern 9 Table 5 Value of squareness 9 Table 6 Value of size accuracy 10 Table 7 Value of
17、tick mark identification . 10 Table 8 Value of quiet zone sufficiency 10 Table 9 Value of uselessness of error correction 11 Table 10 Value of decodability . 11 IEC 62875:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MULTIMEDIA SYSTEMS AND EQUIPMENT MULTIMEDIA E-PUBLISHING AND E-BOOK T
18、ECHNOLOGIES PRINTING SPECIFICATION OF TEXTURE MAP FOR AUDITORY PRESENTATION OF PRINTED TEXTS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IE
19、C is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS)
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28、ensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62875 h
29、as been prepared by technical area 10: Multimedia e- publishing and e-book technologies, of IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this standard is based on the following documents: CDV Report on voting 100/2292/CDV 100/2400/RVC Full information o
30、n the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 IEC 62875:2015 IEC 2015 The committee has decided that the contents of this publication will remain
31、 unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issu
32、ed at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. IEC 62875:2015 IEC 2015 5
33、MULTIMEDIA SYSTEMS AND EQUIPMENT MULTIMEDIA E-PUBLISHING AND E-BOOK TECHNOLOGIES PRINTING SPECIFICATION OF TEXTURE MAP FOR AUDITORY PRESENTATION OF PRINTED TEXTS 1 Scope The texture map for auditory presentation of printed texts is printed on paper or shown on display devices. This International Sta
34、ndard specifies the printing quality of this texture map on paper. In order to ensure an interoperability of the texture map specified in IEC 62665, a printing specification based on the quality of this International Standard should be employed. 2 Normative reference The following documents, in whol
35、e or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62665, Multimedia systems and equip
36、ment Multimedia e-publishing and e-books technologies Texture map for auditory presentation of printed texts 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 texture map two dimensional cell patterns which include alignment lines and a data ma
37、trix SOURCE: IEC 62665, 2.1, modified Definition has been clarified. 3.2 data matrix two dimensional cell patterns generated from text data compression and error correction encoding 3.3 cell minimum square dot which constitutes a data matrix 3.4 alignment line border line which encloses a texture ma
38、p Note 1 to entry: An alignment line consists of solid lines and tick marks. The solid lines have a cells width and may partially be interrupted. Note 2 to entry: For additional information on alignment lines, see IEC 62665. 6 IEC 62875:2015 IEC 2015 3.5 tick mark positioning mark which intersects p
39、erpendicularly with the solid lines and is given at equal intervals on the solid lines of an alignment line Note 1 to entry: A tick mark indicates the unit boundary and has a cells width. 3.6 quiet zone non-printing area outside of a texture map 3.7 unit square area which consists of 11 11 cells in
40、a texture map 4 Printing specification 4.1 General Texture maps generated by a system are specified by IEC 62665 and a printing quality of the texture maps has to be standardized to ensure interoperability of the printed texture maps. Texture maps should be printed on paper with a resolution of 600
41、dpi (dots per inch, 23,622 dot/mm). In order to minimize specular reflection, a mat coated paper or a low reflection paper should be used. 4.2 Size of a texture map Four sizes of a texture map are specified by IEC 62665 and they have their dimensions shown in Table 1. Table 1 Sizes of a texture map
42、Size Number of cells Number of units Dimensions at printing mm XS 40 40 3 3 6,8 6,8 S 73 73 6 6 12,4 12,4 M 106 106 9 9 17,9 17,9 L 117 117 10 10 19,8 19,8 4.3 Printing quality of a texture map 4.3.1 Printing quality Printing quality of a texture map is defined by the average Q of values of the foll
43、owing quality measures and indicated with the symbol A, B, C, D or F, as shown in Table 2. The following aspects define the printing quality: a) print contrast; b) symmetry of cell pattern; c) squareness; d) size accuracy, e) tick mark identification; f) quiet zone sufficiency; IEC 62875:2015 IEC 20
44、15 7 g) uselessness of error correction, and h) decodability. Table 2 Printing quality of a texture map Q (average of the values of quality measures a) through h) Printing quality of a texture map 3,4 Q 4,0 A 2,6 Q 3,4 B 1,8 Q 2,6 C 1,0 Q 1,8 D Q 1,0 F 4.3.2 Sampling line The values of quality measu
45、res a) through d) are defined by scanning cells on 10 sampling lines (5 horizontal and 5 vertical lines). A sampling line connects the corresponding tick marks on the opposite alignment lines, as shown in Figure 1. For the size XS texture map, every tick mark is connected by a sampling line. For siz
46、e S, M and L texture maps, every other tick mark is connected by a sampling line. The values of quality measures a) through d) are defined by scanning cells on 10 sampling lines (5 horizontal and 5 vertical lines). A sampling line connects the corresponding tick marks on the opposite alignment lines
47、 as shown in Figure 1. For size XS texture map, every tick mark is connected by a sampling line. For size S, M and L texture maps, every other tick mark is connected by a sampling line. Figure 1 Sampling lines in case of size M texture map Width of quiet zone IEC 8 IEC 62875:2015 IEC 2015 4.3.3 Qual
48、ity measure Each quality measure is defined as follows: a) print contrast For the reflectance pattern of white and black cells on scanning the sampling lines, using RL minminimum value of reflectance of white cells, RL aveaverage value of reflectance of white cells, and RD maxmaximum value of reflec
49、tance of black cells, RC is defined as RC = (RL min RD max ) / RL ave . (1) The value of the print contrast is determined in accordance with the range of RC, as shown in Table 3. Table 3 Value of print contrast RC Value of print contrast 0,90 RC 4 0,85 RC 0,90 3 0,80 RC 0,85 2 0,75 RC 0,80 1 RC 0,75 0 b) symmetry of cell pattern For the reflectance pattern of white and black cells on scanning
