单字符的 command 是要对指定行执行的操作。
The single-character command is the action to perform on the specified lines.
文中提出了灰度图像下的行分割方法和基于最大宽度回溯算法的单字分割算法，从而实现了字符的精确定位。
We provide the algorithm of line segmentation under gray level image and character segmentation based on the biggest width backtracking algorithm to get the accurate position of characters.
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