A new color visual cryptography scheme with perfect contrast

In this paper, we propose a new color visual cryptography scheme based on the modified visual cryptography. This scheme can share a color secret image over n-1 arbitrary natural images and one noise-like share image. Instead of altering the contents of natural images, the encryption process extracts feature images from each natural image. In such a way, the proposed approach can effectively reduce the transmission risk and solve the management problems. Moreover, this approach avoids the pixel expansion problem and makes it possible to recover secret images without any distortion. Thus, the proposed scheme can share b&w, gray-level or color images in a secret way and is easy to implement.