CAJ | 학술논문

针对以往的渐进式可视密码多是以像素扩展为基础且分享图像是杂乱无章的问题，提出使用分享矩阵来产生不扩展的分享图像，并利用数字水印技术产生有意义的分享图像。与现有方案相比，该方案具有良好的对比度与安全性，且没有引入任何像素膨胀。
침대이왕적점진식가시밀마다시이상소확전위기출차분향도상시잡란무장적문제，제출사용분향구진래산생불확전적분향도상，병이용수자수인기술산생유의의적분향도상。여현유방안상비，해방안구유량호적대비도여안전성，차몰유인입임하상소팽창。
Considering previous researches of progressive visual cryptography were all based upon pixel-expansion and the generated shares were noise like images,this paper proposed a new progressive visual cryptography to produce pixel-unexpand-ed shares.Based on the algorithm,it used a digital watermarking technique to generate meaningful shares.Compared with pre-vious schemes,the presented scheme can hide images in different meaningful shares providing high security and recovered im-age with high contrast.