A Visual Cryptography Secret Image Sharing Scheme with Quad-tree Structure

• Main Authors: Yu Shih-Hsuan, 游識玄
• Other Authors: Yang Chyuan-Huei Thomas
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/4zkvkg

碩士 === 玄奘大學 === 資訊管理學系碩士班 === 105 === With more and more developed the information technology industry, so how to safely pass information becomes very important. In recent years, many people discuss on visual cryptography secret sharing methods. The characteristics of visual secret sharing can be seen confidential images directly to the human eye without complex operations. In this study, we use the quad-tree structure to represent the secret image with two kinds of methods, one is applying Naor and Shamir (2, 2) visual Cryptography Secret Image Sharing Scheme and another is applying a codebooks to separate it into 2 to 4 parts to share. Experiments have shown that the results can have the general effect of visual cryptography. The secret image can be retrieved to the original image with extended pixels and the original-like secret image with non-extended pixels from any two of sharing parts.