Content based image retrieval (CBIR) is one of the fields of Multimedia information retrieval.The difficulty of CBIR is to properly express the contents of the images.

• 基于内容的图像信息检索是多媒体信息检索领域中重要的组成部分,对图像的内容进行准确快速的描述一直都是图像检索技术中研究的重点和难点。