ISOIEC 15938-12 FCD 查询格式：多媒体内容描述接口标准

MPEG-7

Query-Format

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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. In the field of information technology, ISO and IEC have

established a joint technical committee, ISO/IECJTC1.

International Standards are drafted in accordance with the rules given in the ISO/IECDirectives, Part2.

The main task of the joint technical committee is to prepare International Standards. 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 document may be the subject of patent rights.

ISO and IEC shall not be held responsible for identifying any or all such patent rights.

ISO/IEC15938-12 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15938 consists of the following parts, under the general title Information technology— Multimedia content

description interface:

 Part 1: Systems

 Part 2: Description Definition Language

 Part 3: Visual

 Part 4: Audio

 Part5: Multimedia Description Schemes

 Part 6: Reference Software



Part 7: Conformance



Part 8: Extraction and use of MPEG-7 descriptions



Part 9: Profiles and Levels



Part10: Schema Definition



Part 11: MPEG-7 Profile Schemas



Part 12: Query Format

XII

Introduction

The MPEG-7 standard also known as "Multimedia Content Description Interface" aims at providing standardized

core technologies allowing the description of audiovisual data content in multimedia environments. This is a

challenging task given the broad spectrum of requirements and targeted multimedia applications, and the broad

number of audiovisual features of importance in such context. In order to achieve this broad goal, MPEG-7

standardizes:

 Datatypes that are description elements not specific to audiovisual domain that corresponds to reusable basic

types or structures employed by multiple Descriptors and Description Schemes.

 Descriptors (D) to represent Features. Descriptors define the syntax and the semantics of each feature

representation. A Feature is a distinctive characteristic of the data, which signifies something to somebody. It is

possible to have several descriptors representing a single feature, i.e. to address different relevant

requirements. A Descriptor does not participate in many-to-one relationships with other description elements

 Description Schemes (DS) to specify the structure and semantics of the relationships between their

components, which may be both Ds and DSs. A Description Scheme shall have descriptive information and

may participate in many-to-one relationships with other description elements.

 A Description Definition Language (DDL) to allow the creation of new DSs and, possibly, Ds and to allows the

extension and modification of existing DSs.

 Systems tools to support multiplexing of descriptions or description and data, synchronization issues,

transmission mechanisms, file format, etc.

The standard is subdivided into twelve parts:

1. Systems: Architecture of the standard, tools that are needed to prepare MPEG-7 Descriptions for efficient

transport and storage, and to allow synchronization between content and descriptions. Also tools related to

managing and protecting intellectual property.

2. Description Definition Language: Language for defining new DSs and eventually also new Ds, binary

representation of DDL expressions.

3. Visual: Visual description tools (Ds and DSs).

4. Audio: Audio description tools (Ds and DSs).

5. Multimedia Description Schemes: Description tools (Ds and DSs) that are generic, i.e. neither purely visual nor

purely audio.

6. Reference Software: Software implementation of relevant parts of the MPEG-7 Standard.

7. Conformance: Guidelines and procedures for testing conformance of MPEG-7 implementations.

8. Extraction and use of MPEG-7 descriptions

9. Profiles and Levels

10. Schema Definition

11. MPEG-7 Profile Schemas

XIII

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