Robust and Fragile Watermarking Techniques for Documents Using Bi-directional Diagonal Profiles. - Ji-Hwan Park; Sook Ee Jeong; Chang Soo Kim (ICICS, 2001)

A New Digital Watermarking for Text Document Images Using Diagonal Profile. - Ji-Hwan Park; Sook Ee Jeong; Young Huh (IEEE Pacific Rim Conference on Multimedia, 2001)