信息技术.多媒体内容描述界面.第1部分:系统

[中文适用范围]： 该国际标准定义了多媒体内容描述接口，指定了从系统到应用程序级别的一系列接口，以允许不同的系统交换有关多媒体内容的信息。 它描述了系统的体系结构、扩展和特定应用程序的语言、音频和视频领域的描述工具以及非特定于视听领域的工具。 ISO/IEC 15938 的这一部分规定了多媒体内容描述通信的系统级功能。 ISO/IEC 15938-1 提供的规范将： ——支持开发 ISO/IEC 15938 接收子系统，称为 ISO/IEC 15938 终端，或简称为终端，用于接收和组装可能分区和压缩的多媒体内容描述 — 提供用于准备多媒体内容描述的规则，包括 ISO/IEC 15938 第 3、4 和 5 部分中指定的工具，以实现高效传输和存储。 ISO/IEC 15938 终端内的解码过程是标准化的。 所提及的规则为多媒体内容描述的准备和编码提供指导，而不会导致此类描述的唯一编码表示。 MPEG-7 标准的这一部分旨在与该标准的其他部分结合实施。 特别是，MPEG-7 第 1 部分：系统假定您了解第 2 部分：描述定义语言 (DDL) 的描述符和描述方案的规范句法定义以及模式和描述的处理方面的一些知识。 ISO/IEC 15938 的第 3、4 和 5 部分定义了获取本部分中的编码技术所参考的描述的方法。 MPEG-7 是一个可扩展的标准。 将标准扩展到标准中提供的描述方案之外的标准方法是在 DDL 中定义新的描述方案，并使这些 DS 与实例化描述一样可访问。 更多详细信息请参阅第 2 部分。 [外文原描述]： This International Standard defines a Multimedia Content Description Interface, specifying a series of interfaces from system to application level to allow disparate systems to interchange information about multimedia content. It describes the architecture for systems, a language for extensions and specific applications, description tools in the audio and visual domains, as well as tools that are not specific to audio-visual domains. This part of ISO/IEC 15938 specifies system level functionalities for the communication of multimedia content descriptions. ISO/IEC 15938-1 provides a specification which will:  enable development of ISO/IEC 15938 receiving sub-systems, called ISO/IEC 15938 Terminal, or Terminal in short, to receive and assemble possibly partitioned and compressed multimedia content descriptions  provide rules for the preparation of multimedia content descriptions consisting of the tools specified in Parts 3, 4 and 5 of ISO/IEC 15938 for efficient transport and storage. The decoding process within the ISO/IEC 15938 Terminal is normative. The rules mentioned provide guidance for the preparation and encoding of multimedia content descriptions without leading to a unique encoded representation of such descriptions. This part of the MPEG-7 Standard is intended to be implemented in conjunction with other parts of the standard. In particular, MPEG-7 Part 1: Systems assumes some knowledge of Part 2: Description Definition Language (DDL) in its normative syntactic definitions of Descriptors and Description Schemes, as well as in the processing of schema and descriptions. The methods for obtaining the descriptions to which the encoding techniques in this part refer are defined in Parts 3, 4, and 5 of ISO/IEC 15938. MPEG-7 is an extensible standard. The standard method of extending the standard beyond the Description Schemes provided in the standard is to define new ones in the DDL, and to make those DSs as accessible as the instantiated descriptions. Further details are available in Part 2.