The imaginary line extending through a font and representing the line on which characters are aligned for printing.
一条通过的字形的假想线，表示印刷时字符应依此线排齐。
Chinese pinyin on the whole document is distilled in order to group the document by characteristics of pinyin, the watermark is inserted by characters' extending in every group.
该方法提取出整个文档的汉字拼音，利用拼音的特点将文档进行分层，在各个层中通过字符水平缩放来嵌入水印。
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