摘要
现有标记视觉密码方案解密图像的视觉质量较差,且存在像素扩展、设计加密矩阵的问题.为此,利用(2,2)随机网格视觉密码方案的特性,通过改进标记图像的嵌入方式和位置来降低分享份中标记信息对秘密信息的影响,从而提高了解密图像的视觉质量.该方案使用随机网格实现,避免了像素扩展和设计加密矩阵的问题,而且能够灵活地调节解密图像的视觉质量.与现有的方案相比,在分享份中嵌入相同比例的标记信息,该方案恢复的秘密图像的视觉质量更好.
Decrypted images of the existing tagged visual cryptography has a poor visual quality and the problems of pixel expansion and design of encryption matrices.So this paper exploits the properties of(2,2)random grid-based visual cryptography to modify the embedding method and location of the tagged images,and improves the visual quality of decrypted images by reducing theimpact of the tagged information on secret information.T'he scheme uses a random grid to avoid pixel expansion and design of encryption matrices,and it can flexibly adjust the visual quality of decrypted images.Compared with the existing schemes,the secret images recovered in this scheme have a better visual quality when the same proportion of tagged information is embedded in shares.
作者
郭松鸽
吕东辉
任艳丽
GUO Songge;LV Donghui;REN Yanli(School of Communication and Information Engineering,Shanghai Univ.,Shanghai 200441,China;Shanghai Institute of Advanced Comniunication and Data Science,Shanghai 200414,China;Key Lab.of Sealable Computing and Systems,Shanghai Jiaotong Univ.,Shanghai 20024 0,China)
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2018年第5期170-176,183,共8页
Journal of Xidian University
基金
国家自然科学基金资助项目(U1736120
61572309)
上海交通大学可扩展计算与系统重点实验室开放课题资助项目
关键词
加密
图像处理
标记视觉密码
随机网格
encryption
image processing
tagged visual cryptography
random grid
