建立字典：
lib.jpg:可能检测到的字，相当于字典，要和lib.txt中的文字对应，可以设置lib.txt后，截图保存得到lib.jpg
检测图片中的字
tes.jpg:需要检测的字，其中出现的字必须在lib.txt中出现过

可以更新lib.jpg和对应lib.txt、tes.jpg，用以扩展可识别的文字内容(Set up a dictionary:
The words that lib.jpg: may detect, equivalent to a dictionary, correspond to the text in the lib.txt, and after the lib.txt can be set, the screenshot is saved to the lib.jpg
Check the words in the picture
The word tes.jpg: needs to be detected, in which the characters must appear in the lib.txt
The lib.jpg and corresponding lib.txt and tes.jpg can be updated to extend the identifiable text content)