Noar and Shamir presented the concept of visual cryptography. Many researches
following it go down the same track: to expand the secret pixels to blocks. As a result, the
size of the secret image becomes larger, and the quality of the expanded secret image
becomes worse. In order to prevent the pixels from expanding, Yang has proposed his
probability-based visual secret sharing scheme, where the concept of probability is employed
to pick out pixels from the black or white sets. In this paper, we shall propose a new scheme
that is a modified version of Yang?s scheme. Our experimental results show that we can
obtain better recovered image quality with high contrast.
Relation:
International Journal of Signal Processing, Image Processing and Pattern 2(1):71-78
