Compared with the first generation standard, a significant character of MPEG-4 is object-based coding which means to code videos as a set of semantic video objects.

相比与第一压缩标准，MPEG - 4最显著的特点之一就是提出了基于对象的编码方式。

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A hierarchical semantic associative video model was proposed which described video information in hierarchical concept tree, scene network and semantic object net.

提出一种视频的分层语义联想模型，构造三个层次的信息：概念层次树，场景网络和语义对象网络。

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Video semantic information is referred to the information about the objects in video streams, including object shape, spatial relation between objects, and events related to objects, etc.

视频语义信息是指描述视频中的物体形状、物体之间空间关系以及物体的事件等内容的信息。

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