Visual Cryptography from Halftone Error Diffusion

2018 ◽  
pp. 32-60
Author(s):  
Gonzalo R. Arce
Keyword(s):  
Visual Cryptography ◽  
Error Diffusion

scholarly journals Flip Extended Visual Cryptography for Gray-Scale and Color Cover Images

Symmetry ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 65
Author(s):  
Lu Wang ◽  
Bin Yan ◽  
Hong-Mei Yang ◽  
Jeng-Shyang Pan
Keyword(s):  
Privacy Protection ◽  
Visual Cryptography ◽  
Color Images ◽  
Cover Image ◽  
Error Diffusion ◽  
Gray Scale ◽  
Secret Image ◽  
Transaction Security

Visual cryptography (VC) has found numerous applications in privacy protection, online transaction security, and voting security, etc. To counteract potential cheating attacks, Lin et al. proposed flip visual cryptography in 2010, where a second secret image can be revealed by stacking one share with a flipped version of another share. The second secret image can be designed as an additional verification mechanism. However, Lin’s scheme produces meaningless shares and is only applicable to binary secret images. It is interesting to explore whether it is possible to extend the flip VC to having cover images (i.e., extended VC) and these cover images are color images. This problem is challenging since too many restricting conditions need to be met. In this paper, we designed a flip VC for gray-scale and color cover images based on constraint error diffusion. We show that it is possible to meet all the constraints simultaneously. Compared with existing schemes, our scheme enjoys the following features: Color cover images, no computation needed for decoding, and no interference from cover image on the recovered secret image.

An Optimized Halftone Visual Cryptography Scheme Using Error Diffusion

2018 ◽  
Vol 77 (19) ◽  
pp. 24937-24953 ◽  
Author(s):  
Mahmoud E. Hodeish ◽  
Vikas T. Humbe
Keyword(s):  
Visual Cryptography ◽  
Error Diffusion ◽  
Visual Cryptography Scheme

Halftone Visual Cryptography Through Error Diffusion

2006 ◽  
Author(s):  
Zhongmin Wang ◽  
Gonzalo R. Arce
Keyword(s):  
Visual Cryptography ◽  
Error Diffusion

Watermark Embedding for Multiscale Error Diffused Halftone Images by Adopting Visual Cryptography

2015 ◽  
Vol 7 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Yuanfang Guo ◽  
Oscar C. Au ◽  
Ketan Tang
Keyword(s):  
Image Watermarking ◽  
Visual Cryptography ◽  
Superior Performance ◽  
Error Diffusion ◽  
Printing Industry ◽  
Halftone Image ◽  
Watermark Embedding ◽  
Simple Implementation ◽  
Exclusive Or ◽  
Halftone Images

Error Diffusion has been widely adopted in the printing industry due to its good visual quality and simple implementation. However, error diffusion still possesses its own deficiencies. Thus multiscale error diffusion (MED) has been developed, and this method outperforms traditional error diffusion according to extensive research results. The majority of previous halftone image watermarking techniques cannot be directly applied to MED halftone images. Since there is no halftone visual watermarking (HVW) method for MED halftone images in existing methods, we propose the first HVW method for MED halftone images, Copyright Protecting Multiscale Error Diffusion (CoP-MED), in this paper. By adopting the visual cryptography principle, CoP-MED can effectively embed a secret pattern into two MED halftone images, where the secret pattern can be decoded clearly by simply overlaying the two stego halftone images or performing not-exclusive-or operation between them. Parameter selection is also discussed based on the experimental results. Later, in comparison tests, CoP-MED shows superior performance compared to existing works.

Color extended visual cryptography using error diffusion

2009 ◽  
Author(s):  
InKoo Kang ◽  
Gonzalo R. Arce ◽  
Heung-Kyu Lee
Keyword(s):  
Visual Cryptography ◽  
Error Diffusion
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