Image Distribution Method with Embedded Identifier Scheme for Copyright Protection. - Takehito Abe; Hiroshi Fujii; Kazuhiko Kushima (ACISP, 1997)

Image-Identification Methods for Camera-Equipped Mobile Phones. - Takehito Abe; Tomonori Takada; Harumi Kawamura; Takayuki Yasuno; Noboru Sonehara (MDM, 2007)