Backgrounds as Information Carriers for Printed Documents. - Koichi Kise; Yasuo Miki; Keinosuke Matsumoto (ICPR, 2000)

Stippling Data on Backgrounds of Pages - Toward Seamless Integration of Paper and Electronic Documents. - Koichi Kise; Yasuo Miki; Keinosuke Matsumoto (ICDAR, 2003)