If character mapping is used, then first consider whether you want to apply normalization to the character being mapped, or apply normalization after the character is mapped.
如果使用字符映射，则首先考虑是否对映射字符进行规范化，还是对映射后的字符规范化。
All whitespace in character content is retained (excluding characters removed during line feed normalization).
保留字符内容中的所有空白(不包括换行规范化过程中删除的字符)。
In writer identification (WI), writing styles are always compared by character matching, while image preprocessing and normalization are very important for matching.
笔迹鉴别多用匹配方法比较字符的书写风格，而字符图像的预处理和归一化对匹配是非常重要的。
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