Visual cryptography for general access structures
Information and Computation
Extended capabilities for visual cryptography
Theoretical Computer Science
Visual cryptography for grey level images
Information Processing Letters
Modern Digital Halftoning
Contrast Optimal Threshold Visual Cryptography Schemes
SIAM Journal on Discrete Mathematics
Visual cryptography for gray-level images by dithering techniques
Pattern Recognition Letters
Visual Authentication and Identification
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
Digital color halftoning with generalized error diffusion and multichannel green-noise masks
IEEE Transactions on Image Processing
Adaptive threshold modulation for error diffusion halftoning
IEEE Transactions on Image Processing
Impact of HVS models on model-based halftoning
IEEE Transactions on Image Processing
Memory efficient error diffusion
IEEE Transactions on Image Processing
Tone-dependent error diffusion
IEEE Transactions on Image Processing
IEEE Transactions on Image Processing
Blue-Noise Multitone Dithering
IEEE Transactions on Image Processing
Enhance the visual quality of shares and recovered secret on meaningful shares visual secret sharing
Proceedings of the 4th International Conference on Uniquitous Information Management and Communication
On the equivalence of two definitions of visual cryptography scheme
ISPEC'12 Proceedings of the 8th international conference on Information Security Practice and Experience
Image hatching for visual cryptography
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP) - Special Issue on Multimedia Security
An extended visual cryptography scheme for continuous-tone images
IWDW'11 Proceedings of the 10th international conference on Digital-Forensics and Watermarking
Improving the visual quality of random grid-based visual secret sharing
Signal Processing
XOR-based meaningful visual secret sharing by generalized random grids
Proceedings of the first ACM workshop on Information hiding and multimedia security
Improved tagged visual cryptography by random grids
Signal Processing
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Halftone visual cryptography (HVC) enlarges the area of visual cryptography by the addition of digital halftoning techniques. In particular, in visual secret sharing schemes, a secret image can be encoded into halftone shares taking meaningful visual information. In this paper, HVC construction methods based on error diffusion are proposed. The secret image is concurrently embedded into binary valued shares while these shares are halftoned by error diffusion--the workhorse standard of halftoning algorithms. Error diffusion has low complexity and provides halftone shares with good image quality. A reconstructed secret image, obtained by stacking qualified shares together, does not suffer from cross interference of share images. Factors affecting the share image quality and the contrast of the reconstructed image are discussed. Simulation results show several illustrative examples.