特征提取可以降低数据空间的维数，挖掘出能更有效的代表目标信息的数据，从而使目标的分类更加准确有效。

The dimension of data can be reduced by feature extraction, and more meaning data about target can be got by feature extraction, which make target classification more exactly and effectively.

youdao

特征提取可以降低数据空间的维数，挖掘出能更有效的代表目标信息的数据，从而使目标的分类更加准确有效。

The dimension of data can be reduced by feature extraction, and more meaning data about target can be got by feature extraction, which make target classification more exactly and effectively.

youdao