Interactive pen-and-ink illustration
SIGGRAPH '94 Proceedings of the 21st annual conference on Computer graphics and interactive techniques
Scale-dependent reproduction of pen-and-ink illustrations
SIGGRAPH '96 Proceedings of the 23rd annual conference on Computer graphics and interactive techniques
Protecting digital media content
Communications of the ACM
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
Extended capabilities for visual cryptography
Theoretical Computer Science
Communications of the ACM
Contrast-optimal k out of n secret sharing schemes in visual cryptography
Theoretical Computer Science - computing and combinatorics
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Modern Digital Halftoning
Line Art Rendering via a Coverage of Isoparametric Curves
IEEE Transactions on Visualization and Computer Graphics
Line Art Illustrations of Parametric and Implicit Forms
IEEE Transactions on Visualization and Computer Graphics
Contrast Optimal Threshold Visual Cryptography Schemes
SIAM Journal on Discrete Mathematics
Efficient visual secret sharing scheme for color images
Pattern Recognition
Sharing multiple secrets in visual cryptography
Pattern Recognition
Visual secret sharing for multiple secrets
Pattern Recognition
Dot-Size Variant Visual Cryptography
IWDW '09 Proceedings of the 8th International Workshop on Digital Watermarking
Halftone visual cryptography via error diffusion
IEEE Transactions on Information Forensics and Security
Real perfect contrast visual secret sharing schemes with reversing
ACNS'06 Proceedings of the 4th international conference on Applied Cryptography and Network Security
Image quality assessment: from error visibility to structural similarity
IEEE Transactions on Image Processing
IEEE Transactions on Image Processing
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Image hatching (or nonphotorealistic line-art) is a technique widely used in the printing or engraving of currency. Diverse styles of brush strokes have previously been adopted for different areas of an image to create aesthetically pleasing textures and shading. Because there is no continuous tone within these types of images, a multilevel scheme is proposed, which uses different textures based on a threshold level. These textures are then applied to the different levels and are then combined to build up the final hatched image. The proposed technique allows a secret to be hidden using Visual Cryptography (VC) within the hatched images. Visual cryptography provides a very powerful means by which one secret can be distributed into two or more pieces known as shares. When the shares are superimposed exactly together, the original secret can be recovered without computation. Also provided is a comparison between the original grayscale images and the resulting hatched images that are generated by the proposed algorithm. This reinforces that the overall quality of the hatched scheme is sufficient. The Structural SIMilarity index (SSIM) is used to perform this comparison.