Adaptive Halftone Watermarking Algorithm Based on Particle Swarm Optimization. - Liuping Feng; Dongsheng Cong; Hou Shu; Ben Liu (J. Multim., 2013)

A halftone visual cryptography schema using ordered dither. - Liuping Feng; Dongsheng Cong; Huaqun Liu; Meng-Min Wang (ICDIP, 2014)