Visual Cryptography for colour images using multilevel thresholding

Visual Cryptography Scheme, is even known as VCS. It is actually a cryptography method to encrypt an image by dividing it in parts called shares, where decryption is performed using Human Visual System (HVS), only by overlapping all these shares. The image to be encrypted is called a secret image. Visual Cryptography can be used for binary image, grayscale image as well as colour image. This paper implements visual cryptography technique for colour images, by using multilevel thresholding so as to enhance the obtained quality contrast of reconstructed image.