A New Watermarking Method with Obfuscated Quasi-Chirp Transform. - Kazuo Ohzeki; Yuanyu Wei; Yutaka Hirakawa; Kiyotsugu Sato (IWDW, 2011)

Consideration of the Watermark Inversion Attack and Its Invalidation Framework. - Kazuo Ohzeki; Yuanyu Wei; Yutaka Hirakawa; Kiyotsugu Sato (IWDW, 2012)