A ruled line extracting apparatus obtains circumscribed rectangles of pixel concatenation regions included in an input pattern, and calculates the most frequent value of their heights. Additionally, the apparatus integrates segments by ignoring a wild card segment, and calculates the most frequent value...http://www.google.de/patents/US6917706?utm_source=gb-gplus-sharePatent US6917706 - Ruled line extracting apparatus for extracting ruled line from normal document image and method thereof
