信息技术.计算机图形和图像处理.对多媒体对象的表示环境(PREMO).第4部分:建模、再现和交互成分

[中文适用范围]： ISO/IEC 14478 的这一部分描述了一组对象类型和非对象类型，以提供多媒体信息的构造、表示和交互。 多媒体信息可以是图形、视频、音频或其他类型的可呈现媒体。 该信息可以通过时间方面来增强。 在本文档中，ISO/IEC 14478 的这一部分也称为“建模、渲染和交互”，并缩写为 MRI。 建模、渲染和交互组件构成了“中间件”框架、位于通用操作系统和计算环境之间的系统软件组件以及作为该组件提供的服务和类型定义的客户端进行操作的特定应用程序。 它提供了一个基于国际标准其他部分定义的基础对象和多媒体系统服务的框架，用于开发分布式和异构设备网络，用于创建多媒体模型、呈现这些模型以及与该过程交互。 建模、渲染和交互组件包含以下特征： a) 提供多媒体基元的层次结构作为抽象框架，用于描述建模和渲染设备的能力，并实现它们的互操作； b) 在原语层次结构中，通过从组件数据逐步构建结构化原语来描述多媒体数据的时间结构的具体规定； c) 为建模器、渲染器和其他支持设备提供抽象类型，从而能够将此类设备或代表真实软件或硬件的任何未来子类型集成到此类设备的处理网络中； d) 提供对象类型以将多媒体原语中表达的同步要求映射到 ISO/IEC 14478-2 和 ISO/IEC 14478-3 提供的流控制和同步机制。 建模、渲染和交互组件依赖于 PREMO 第 2 部分：基础组件 (ISO/IEC 14478-2) 和 PREMO 第 3 部分：多媒体系统服务 (ISO/IEC 14478-3) 中定义的对象类型和服务。 [外文原描述]： This part of ISO/IEC 14478 describes a set of Object types and non-Object types to provide the construction of, presentation of, and the interaction with Multimedia information. The multimedia information tan be graphics, Video, audio, or other types of presentable media. This information tan be enhanced by time aspects. Throughout this document this part of ISO/IEC 14478 will also be referred to as "Modelling, Rendering and Interaction", and abbreviated as MRI. The Modelling, Rendering and Interaction Component constitutes a framework of ?Middleware', System Software components lying between the generic operating System and computing environment, and a specific application operating as a client of the Services and type definitions provided by this component. It provides a framework over the foundation objects and multimedia Systems Services defined in other Parts of the international Standard for the development of a distributed and heterogeneous network of devices for creating multimedia models, rendering these models, and interacting with this process. The Modelling, Rendering and Interaction Component encompasses the following characteristics: a) Provision of a hierarchy of multimedia primitives as an abstract framework for describing the capabilities of modelling and rendering devices, and for enabling their interoperation; b) within the primitive hierarchy, specific Provision for describing the temporal structure of multimedia data through the stepwise construction of structured primitives from component data; c) Provision of abstract types for modelers, renderers and other supporting devices, enabling the integration of such devices or any future subtypes representing real Software or hardware, into a processing network of such devices; d) provision of an Object type to map synchronization requirements expressed within multimedia primitives into control of the stream and synchronization mechanisms provided by ISO/IEC 14478-2 and ISO/IEC 14478-3. The Modelling, Rendering and Interaction Component relies on the Object types and Services defined in PREMO Part 2: Foundation Components (ISO/IEC 1447%2), and PREMO Part 3: Multimedia Systems Services (ISO/IEC 14478-3).