Semi-vector error diffusion for color images

1998 ◽  
Author(s):  
Zhigang Fan ◽  
Steven J. Harrington
Keyword(s):  
Color Images ◽  
Error Diffusion ◽  
Vector Error

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.

Improved Vector Error Diffusion for Reduction of Smear Artifact in the Boundary Regions

2003 ◽  
Author(s):  
Soon-Chang Lee ◽  
Yun-Tae Kim ◽  
Yang-Ho Cho ◽  
Yeong-Ho Ha
Keyword(s):  
Error Diffusion ◽  
Vector Error

Arithmetic coding model for color images processed by error diffusion

1991 ◽  
Author(s):  
Nobuhito Matsushiro ◽  
Osamu Asada ◽  
Kenzo Tsuji
Keyword(s):  
Color Images ◽  
Arithmetic Coding ◽  
Error Diffusion
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