The existing color feature extraction methods include color histogram, accumulative color histogram, color moments.
传统的颜色特征提取方法主要包括颜色直方图、累积直方图、颜色矩等。
Through analyzing the iris feature and combining with different feature extraction methods, we can realize iris recognition.
通过分析研究虹膜上丰富的纹理特征，结合不同的特征提取方法和分类器可以实现虹膜的身份认证。
Proposed feature extraction methods for structure, connected body, closed area and stroke in Chinese character's feature extraction.
在特征提取方面，给出了汉字结构点，连通体，封闭区域，笔划等特征的提取方法。
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。
Different from the existing kernel feature extraction methods, the kernel function used in the proposed one is not required to satisfy Mercers theorem so that they can be chosen from a wide range.
与现有的核特征抽取方法不同，该方法不需要核函数满足mercer定理，从而增加了核函数的选择范围。
Different from the existing kernel feature extraction methods, the kernel function used in the proposed one is not required to satisfy Mercers theorem so that they can be chosen from a wide range.
与现有的核特征抽取方法不同，该方法不需要核函数满足mercer定理，从而增加了核函数的选择范围。
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