用作描述符的一种字、符号或数，用于从某一集合中，特别是从某一配位标引系统中检索信息。

A word, symbol, or number used as a descriptor for retrieval of information from a collection, especially in a coordinate indexing system.

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传统的图像索引方法从图像数据库中按照关键字或号码，和按分类描述来检索引图像。

In traditional method of image retrieval searches images according to keys, number and sort describe from image database.

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现有的许多多媒体数据库系统只提供了基于媒体描述关键字的检索和查询，却忽略了另一个重要的信息来源——媒体的内容。

In many current multimedia database systems, query or retrieval is only based on descriptive KeyWords of media, it ignores another important information resource the content of media.

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