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为解决传统可视密码像素膨胀及分存图像无意义等问题,文中提出了一个具有掩盖图像的(2,2)可视密码方案。方案中密图为黑白反色图像,利用半色调技术将两个灰度图像处理后的半色调图像作为掩盖图像,根据密图修改掩盖图像生成分存图像,叠加分存图像恢复密图。方案符合可视密码解密简单的特性且分存图像有意义,没有引入任何像素膨胀。
In order to solve the problems of traditional visual cryptography, such as pixel expansion and pointlessness, the paper proposes a (2, 2) visual cryptographic scheme with concealed images. In this scheme, the black-and-white anti-color image is used. The half-tone image is used to mask the half-tone image processed by the two gray-level images. The hidden image is modified and the hidden image is generated. The scheme complies with the visual password to decrypt the simple features and to divide the image into meaningful, without introducing any pixel bloat.