Research On Visual Cryptography Scheme Without Pixel Expansion

Visual cryptography, as a new secret sharing technology, using only one eye to get theoriginal image, which improves the complexity of the traditional technology and protectsinformation security better. In this paper, considering of the pixel expansion in visualpassword was introduced before, we propose a visual code scheme called pixel does notextend, where the share image has the same size with the original image. From theperspective of processing pixel number, it makes the transport and carry more secure, since itworks from the original treatment by one pixel to a four pixels, meanwhile the recoveredimage itself remains the same size.mainly extends the results of Ujjwal Chakraboty, and tries to get in line with thecomparative and safety conditions of（2,3）. Also, we compare with the solution has givenand verify them with some examples.In order to enhance the security of a dense graph information and reduce the risk ofinformation leaks, more scholars and experts concentrate on the test plan. Design program isgiven in this paper for the pixel non-expansion（2,3）as well as its validation. We confirmedthe effectiveness of the solution given by experiment. The experimental results show that thegiven scheme has a better contrast and the definition of a recovered image. Each time thesolution is given by processing the22pixels of the pixel block, rather than dealing withonly one pixel. It raised the speed of the image sharing, as a result, the experimental resultsshow the effectiveness of the scheme.