提取图像的mser（最大极值稳定区域）特征，进行连通域分析，然后闭运算，滤掉一部分的无关区域，最后保留满足条件的文本行，文本行的信息保存在rec_word-Extract image mser (maximum extremum stable region) characteristics of connected domain analysis, and then closed operation, part of the filter out irrelevant area, finally