ISO/IEC 10918-4:1999 情報技術—連続トーン静止画像のデジタル圧縮とコーディング：JPEGプロファイル、SPIFFプロファイル、SPIFFタグ、SPIFFカラースペース、APPnマーカー、SPIFF圧縮タイプおよび登録機関（REGAUT）の登録—パート4： | ページ 2

2.1 同一の ITU-T 勧告 |国際規格

Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, 3.

In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this part of ISO/IEC 10918 may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.

International Standard ISO/IEC 10918-4 was prepared by Joint Technical Committee ISO/IEC JTC 1, Informationtechnology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, in collaboration with ITU-T. The identical text is published as ITU-T Recommendation T.86.

ISO/IEC 10918 consists of the following parts, under the general title Information technology — Digital compressionand coding of continuous-tone still images:

• Part 1: Requirements and guidelines
• Part 2: Compliance testing
• Part 3: Extensions
• Part 4: Registration of JPEG profiles, SPIFF profiles, SPIFF tags, SPIFF colour spaces, APPn markers, SPIFFcompression types and Registration Authorities (REGAUT)
• Part 5: MHEG subset for base level implementation

Annexes A to C of this part of ISO/IEC 10918 are for information only.

Please note that the following definitions were omitted in subclause 3.2"Abbreviations and Acronyms":

1 Scope

This Recommendation | International Standard provides for the unique registration of JPEG and SPIFF Profiles, SPIFF Tags, SPIFF colour Spaces, application specific Markers, SPIFF Compression types and images Registration authorities as defined in the CCITT Rec. T.81 | ISO/IEC 10918-1 and ITU-T Rec. T.84 | ISO/IEC 10918-3. Unless otherwise specified, (P)rofiles, (T)ags, colour (S)paces, (M)arkers, (C)ompression types and image (R)egistration authorities will be referred to as PTSMCR items. ISO/IEC JTC 1 SC 29 will delegate to a designated Authority the role to collect, study, approve, register and disseminate the relevant information to allow for the customization of JPEG standard.

The following table gives an overview of the main issues about registration of PTSMCR items.

2 Normative references

The following Recommendations and International Standards contain provisions which, through references in this text, constitute provisions of this Recommendation | International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation | International Standard are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations.

2.2 Additional references

3 Definitions, abbreviations, and symbols

3.1 Definitions

In addition to the definitions used in CCITT Rec. T.81 | ISO/IEC 10918-1 and ITU-T Rec. T.84 | ISO/IEC 10918-3, the following definitions used in this Recommendation | International Standard are listed below.

3.2 Abbreviations and acronyms

For the purposes of this Recommendation | International Standard, the following abbreviations apply.

3.3 Symbols

For a listing of symbols used in this Recommendation | International Standard see CCITT Rec. T.81 | ISO/IEC 10918-1 and ITU-T Rec. T.84 | ISO/IEC 10918-3.