The traditional float vector based image feature is the base of content based image retrieval techniques.

传统的以浮点矢量形式表示的图像特征，是基于内容的图像检索技术的基础。

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Therefore, content-based image retrieval techniques have emerged, and it become hot in the field of image retrieval research.

因此，基于内容的图像检索技术就应运而生，并逐渐地成为图像检索领域的研究热点。

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Content based image retrieval techniques usually use the color histogram of the full image. But this method can't contain the spatial features.

基于内容的图象检索技术一般采用颜色直方图为特征，但是这种方法不能反映空间特性。

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