As information is vast, the query speed in image retrieval system is important.

图像检索因信息量巨大，查询速度至关重要。

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Absrtact: Active learning plays a vital role in image retrieval with a little amount of training instances.

摘要：主动学习对于复杂、主观、使用少量训练实例的图像检索查询具有非常有效的作用。

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The contents of image include low level visual features and high level semantic in image retrieval based on content.

在基于内容的图像检索中，图像的内容包括图像的低层视觉特征和高层语义。

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The image retrieval and recognition are thus done simultaneously, in a single step, and it is possible to search for thousands of targets with extraordinary efficiency.

ECONOMIST: Optical recognition