摘要
针对图视密码学方案存在的恢复图像的对比度和清晰度降低,且像素扩展太大,生成分存图像太大的缺点.对灰度图像图视密码学方案的特点进行了分析,采用小波变换对其进行了改进,对分存图像进行压缩,降低分存图像规模.
Visual cryptography scheme has its shortcomings: the contrast and resolution are decreased, and the pixel expansion makes the size of the share transparencies very big. so wavelet transform is applied to compress the share image and reduce the size.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2005年第3期412-413,422,426,共4页
Journal of Harbin Institute of Technology
关键词
图视密码学
小波变换
图像压缩
秘密共享
Visual cryptography
Wavelet transform
Image compression
Secret sharing
