12. The method according to claim 10 , wherein the text character set is divided into m text character groups in terms of the geometry or image features of the text characters of the text character set, wherein m is not less than 2.
12. The method according to claim 10 , wherein the text character set is divided into m text character groups in terms of the geometry or image features of the text characters of the text character set, wherein m is not less than 2. 14. The method according to claim 12 , wherein a criterion of dividing the text character set in terms of the geometry or image features of text characters of the text character set comprises: geometry features, image features of the various regions, wherein each text character is segmented into p regions, and p is not less than 2.