Secure digital photograph handling with watermarking technique in insurance claim process. - Kazuharu Toyokawa; Norishige Morimoto; Satoko Tonegawa; Koichi Kamijo; Akio Koide (Security and Watermarking of Multimedia Contents, 2000)

Optimizing Watermarking to Improve the Robustness without Affecting the Fidelity. - Koichi Kamijo (ITCC, 2001)

Electronic clipping system with invisible barcodes. - Koichi Kamijo; Noboru Kamijo; Masaharu Sakamoto (ACM Multimedia, 2006)

Invisible barcode with optimized error correction. - Koichi Kamijo; Noboru Kamijo; Gang Zhang (ICIP, 2008)

Anonymity-Aware Face-to-Face Mobile Payment. - Koichi Kamijo; Toru Aihara; Masana Murase (MobiQuitous, 2010)

Personality Estimation from Japanese Text. - Koichi Kamijo; Tetsuya Nasukawa; Hideya Kitamura (PEOPLES@COLING, 2016)

[Invited] An Analysis of Life Tech Related IPRs : A comparison study on Pharmaceutical vs. Non-Pharmaceutical Patents. - Yaeko Mitsumori; Hiroshi Kato; Koichi Kamijo (LifeTech, 2022)

Improving the Recognition Rate of Facial Expressions and Behavior Through Frontalization and Data Augmentation. - Kazuo Ohzeki; Aki Saito Shiojiri; Koichi Kamijo; Masami Suzuki (ICCAE, 2024)