提出的脱机手写体汉字识别系统主要研究特征提取和分类识别两个模块。

The proposed off-line handwritten Chinese character recognition system was composed of a feature extraction module and a recognition module.

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虹膜识别系统一般可由虹膜定位、图像预处理、虹膜特征提取和分类识别几个部分组成。

Iris recognition system is made up by iris localization component, iris image preprocessing, iris feature extraction and classification.

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为了提高手写数字的识别率，研究者在预处理阶段、特征提取和分类识别阶段都提出了很多方法。

In order to improve the accuracy rate of recognition of handwritten number, the researchers have done a lot of work at the pre-processing stage, feature extraction and classification stage.

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