Applied Shamir's Scheme with Multiple Levels of Integer Wavelet Transform for Secret Image Sharing

• Main Authors: Jhih-Hao Syue, 薛志豪
• Other Authors: Chyuan-Huei Thomas Yang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/33727345567394079137

碩士 === 玄奘大學 === 資訊管理學系碩士班 === 100 === We proposed an image sharing based on multiple levels of Haar wavelet transform and Shamir’s method. Previous works progress secret image sharing method with Shamir’s algorithm in a whole image. We apply discrete Haar wavelet transform to reduce the secret image to its quarter size or even smaller size firstly, i.e. the level one, level two, or level three of the LL subband. Then employ the modified Shamir’s algorithm to this LL subband to produce the shadow images. In retrieval step we use the Lagrange method with enough numbers of the shadow images to reconstruct the original image. Since the Shamir’s and Lagrange algorithms spend more time during the processing of the secret image sharing. Our method only processes a quarter or 1/4n of image that can decrease computation time, and still achieve to recover the secret image reversible. The experiment results show our method is faster and retrieve secret image completely.