短語詞組短語handwritten Chinese characters adhesion segmentation 手寫漢字粘連切分handwritten chinese characters segmentation 手寫漢字切分handwritten characters segmentation 手寫字符分割Characters segmentation Separator 分隔符license plate characters segmentation 車牌字符分割merged characters segmentation 粘連字符分割characters segmentation of lieense plate 字符分割segmentation of characters 字符分割 返回 character segmentation