Perceptual grouping refers to the human visual ability to extract significant image relations from lower-level primitive image features without any knowledge of the image content.

感知归类是指人们在不拥有任何图像内容知识的前提下，从底层原始图像特征中提取有效的图像联系的一种视觉能力。

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SIFT features are distinctive local image features.

SIFT特征向量是一种图像局部特征向量。

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The local image features are always corresponding to specific semantic classes.

图像局部特征往往对应着特定的语义类别。

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