Daisuke Nishiwaki Masato Hayashi Atsushi Sato Robust Frame Extraction and Removal for Processing Form Documents. 36-45 2001 conf/grec/2001 GREC http://link.springer.de/link/service/series/0558/bibs/2390/23900036.htm db/conf/grec/grec2001.html#NishiwakiHS01