Halftone visual cryptography by iterative halftoning
Zhongmin Wang, Gonzalo R. Arce · 2010
Halftone visual cryptography (HVC) is a visual sharing scheme where a secret image is encoded into halftone shares taking meaningful visual information. In this paper, novel construction method of HVC based on an iterative halftoning method is proposed. The secret image is concurrently embedded into binary valued shares while these shares are halftoned by constrained iterative halftoning. The proposed method is able to generate halftone shares showing natural images with high image quality. Reconstructed secret images, obtained by stacking qualified shares together, does not suffer from cross interference of share images. Simulations are provided to show the effectiveness of our proposed method.