ISO-14496-18-TECH-CORR-1-2007.pdf
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1、 ICS 35.040 Ref. No. ISO/IEC 14496-18:2004/Cor.1:2007(E) ISO/IEC 2007 All rights reserved Published in Switzerland INTERNATIONAL STANDARD ISO/IEC 14496-18:2004 TECHNICAL CORRIGENDUM 1 Published 2007-02-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION INT
2、ERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALE Information technology Coding of audio-visual objects Part 18: Font compression and streaming TECHNICAL CORRIGENDUM 1 Technologies de linformation Codage des objets audiovisuels Partie 18: Compression et transmission de
3、 polices de caractres RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to ISO/IEC 14496-18:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. ISO/IEC 14496-18:2004/Cor.1:2007(E) 2
4、ISO/IEC 2007 All rights reserved In subclause 4.2.4.7, replace the first 20 lines of Table 9 with the following: 0 2 0 8 N/A 0 N/A + 1 0 - 2 256 + 3 256 - 4 512 + 5 512 - 6 768 + 7 768 - 8 1024 + 9 1024 - 10 2 8 0 0 N/A + N/A 11 0 - 12 256 + 13 256 - 14 512 + 15 512 - 16 768 + 17 768 - 18 1024 + 19
5、1024 - In subclause 5.2.1, replace the text of the first paragraph: A font data access unit conveys data for one single font, or a subset thereof. Two access unit formats are specified, discriminated by the DecoderSpecificInfo for the font data stream (see subclause 5.4). Only one of these access un
6、it formats can be selected for a given font data stream. with the following text: A font data access unit conveys data for one single font, or a subset thereof. Fonts may support a wide variety of different languages and may have a large number of glyphs. While there are some fonts that support, for
7、 example, full Latin character set, there are other fonts that support only English alphabet, which can be considered a subset of Latin characters. When a font is used for text rendering, only a limited number of glyphs can be utilized, and the transmission of the whole font may not be necessary. In
8、 order to reduce the amount of data sent, and to improve the efficiency of the font data streams, fonts can be reduced in size (subsetted) by keeping only those glyphs that are utilized in a particular text fragment, and the additional required general font information. Therefore, the font subsets a
9、re complete, self-sufficient and fully functional fonts containing a limited number of glyphs. A font subset shall be conformant to the fontFormat specified in the header of the access unit. When the value of fontFormat is 0x01, 0x02 or 0x03, the content of fontData shall be conformant to OpenType s
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- ISO 14496 18 TECH CORR 2007
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