Abstract—Since the introduction of threshold visual cryptography by Naor and Shamir, there have been many other schemes proposed; some of them support color images with a limited number of color levels while a few others achieve the property of no pixel expansion. However, it is unknown if there is a scheme which can satisfy all the following five commonly desired properties: (1) supporting images of arbitrary number of colors; (2) no pixel expansion; (3) no preprocessing of original images (e.g. dithering or block averaging); (4) supporting k-out-of-n threshold setting; and (5) a ‘tunable ’ number of color levels in the secret share creation process. In this paper, we answer this question affirmatively by proposing a k-out-of-n threshold v...
A visual cryptography scheme encodes a black and white secret image into n shadow images called shar...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
AbstractIn a visual cryptography scheme a secret image is encoded into n shares, in the form of tran...
Visual cryptography schemes allow the encoding of a secret image, consisting of black or white pixel...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
AbstractA visual cryptography scheme encodes a black and white secret image into n shadow images cal...
A visual cryptography scheme encodes a black and white secret image into n shadow images called shar...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
A visual cryptography scheme encodes a black and white secret image into n shadow images called shar...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
AbstractIn a visual cryptography scheme a secret image is encoded into n shares, in the form of tran...
Visual cryptography schemes allow the encoding of a secret image, consisting of black or white pixel...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
AbstractA visual cryptography scheme encodes a black and white secret image into n shadow images cal...
A visual cryptography scheme encodes a black and white secret image into n shadow images called shar...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed...
A visual cryptography scheme encodes a black and white secret image into n shadow images called shar...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...
In a visual cryptography scheme a secret image is encoded into n shares, in the form of transparenci...