New Visual Cryptography Algorithm For Colored Image

TL;DR

This paper introduces a novel visual cryptography method for color images that encodes a secret image into three transparencies, allowing reconstruction by stacking them without complex computation.

Contribution

It presents a new color visual cryptography algorithm that encodes four images into three transparencies for simple human-vision-based decoding.

Findings

Reconstructed images match original size and quality.

Decoding process is simple and requires only stacking transparencies.

Applicable to color images with straightforward implementation.

Abstract

Visual Cryptography is a special encryption technique to hide information in images, which divide secret image into multiple layers. Each layer holds some information. The receiver aligns the layers and the secret information is revealed by human vision without any complex computation. The proposed algorithm is for color image, that presents a system which takes four pictures as an input and generates three images which correspond to three of the four input pictures. The decoding requires only selecting some subset of these 3 images, making transparencies of them, and stacking them on top of each other, so the forth picture is reconstructed by printing the three output images onto transparencies and stacking them together. The reconstructed image achieved in same size with original secret image.