Image's feature value extraction (IFVE) is consisted of an important part in image processing.

图像特征值的提取是图像处理技术的一个重要组成部分。

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Feature value extraction is key technology in text processing, outstanding feature value could really embody the attribute of the text.

特征值提取是文本处理中的关键技术，优秀的特征值才能真正反映出文本的属性。

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Classical feature extraction methods include: Principle Component Analysis, Singular Value Decomposition, Projection Pursuit, Self-Organizing Map, and so on.

传统的特征提取方法主要有：主分量分析、奇异值分解、投影追踪、自组织映射等。

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