进行处理之前的规格化字符串。规格化包括移除url编码、移除非法字符等操作。此标记对URL和编码后url报头的处理很有效。

Normalizes string before processing. Normalization includes removing of an URL-encoding, illegal characters, etc. This flag is useful with URLs and URL-encoded headers.

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个体指纹被采集成指纹图像后，首先采用基于自身灰度均值和方差的规格化方法，降低指纹脊、谷线之间的灰度变化程度；

Based on the mean value and variance, the image normalizing is to reduce the variations of gray between fingerprint ridges and furrows;

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