基于内容检索的一种中间表达机制

An Intermediate Expressing Mechanism of Contentbased Retrieval

在对多媒体信息进行基于内容的检索时，灵活有效的检索表达机制是影响系统性能的重要因素．现有系统都采用十分简单的表达机制，难以处理复杂的检索要求．通过分析，文章提出了将检索请求映射为特征空间上的相似度分布函数，并提供了一种组合机制——ＣｂＥｘｐｒ（ｃｏｎｔｅｎｔｂａｓｅｄｅｘｐｒｅｓｓｉｏｎ）来使底层的单特征检索近似此相似度分布函数，从而完成对于复杂检索基于内容检索要求的处理．文章阐述了ＣｂＥｘｐｒ的基本思想和示例。

Flexible expressing mechanism is an important factor influencing system performance in contentbased retrieval, the simple mechanisms current systems employed can not express complex content queries. In this paper, an intermediate query expressing mechanismCbExpr is proposed. The mechanism first maps each content query to a similarity distribution function in feature space, then approximates this function using basic single feature queries. Basic thoughts and examples are given, also with implementation on Internet/Navigator platforms.