ISO/IEC 14496-18:2004 信息技术 音频-可视对象的编码 第18部分：字体压缩和流式传输
标准编号：ISO/IEC 14496-18:2004
中文名称：信息技术 音频-可视对象的编码 第18部分：字体压缩和流式传输
英文名称：Information technology — Coding of audio-visual objects — Part 18: Font compression and streaming
发布日期：2004-07
标准范围
ISO/IEC 14496-18:20 04是MPEG-4国际标准套件的一部分。它指定了字体数据表示、压缩和流式传输，提供了在MPEG-4编码表示中嵌入字体数据的高效机制。它还定义了MPEG-4文本配置文件和级别。ISO/IEC 14496(MPEG-4)系列由MPEG(Motion Picture Experts Group)开发，并且定义了用于压缩、编码和传送由不同媒体对象组成的复杂视听场景的技术集合:视频对象(自然或合成视频)；音频对象；静止图像；文本和矢量图形；计算机动画图像。MPEG-4提供了一种标准化的方式来:表示视听对象的内容；描述这些物体在复合媒体场景中的组成；编码、复用和同步与媒体对象相关联的数据；在不同信道上传输媒体呈现；与接收端的视听场景进行交互。几乎任何媒体演示的一个重要部分都涉及使用特定或自定义字体创建的文本对象。字体选择决定了文本在多媒体内容中的外观，并且在整个场景组成中也起着关键作用，因为字体的度量属性用于多媒体内容布局的文本部分。如今，有成千上万种字体可用于内容创建。为了确保文本的可读性和易读性以及内容的正确外观和布局，字体数据必须作为多媒体呈现的一部分与文本对象一起被包括(嵌入)。
ISO/IEC 14496-18:2004 is part of the MPEG-4 suite of International Standards. It specifies font data representation, compression and streaming, providing an efficient mechanism to embed font data in MPEG-4 encoded presentations. It also defines MPEG-4 Text profiles and levels.
The ISO/IEC 14496 (MPEG-4) series has been developed by MPEG (Motion Picture Experts Group) and defines the set of technologies for compression, encoding and delivery of complex audio-visual scenes composed of different media objects:
MPEG-4 provides a standardized way to:
An essential part of almost any media presentation involves text objects that are created using specific or custom fonts. Font selection determines the appearance of text in multimedia content and also plays a critical role in the overall scene composition, since the metric properties of a font are used for textual parts of multimedia content layout. Many thousands of fonts are available today for use in content creation. In order to assure the readability and legibility of text as well as the correct appearance and layout of content, the font data must be included (embedded) with the text objects as part of the multimedia presentation.
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