Adaptive color-to-gray image mapping using directional transform. - Yuko Miyashita; Yuichi Tanaka 001; Madoka Hasegawa; Shigeo Kato (ICIP, 2012)

Improved adaptive color embedding and recovery using DC level shifting. - Yuko Miyashita; Madoka Hasegawa; Shigeo Kato; Yuichi Tanaka 001 (ICASSP, 2013)