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基于多项式插值的秘密共享方案(SS)能精确重构秘密信息,但其计算复杂度较高.可视分存方案(VSS)利用人眼视觉效应重构秘密信息,无需密码计算,但存在像素膨胀和对照度的损失.Wang等人提出了一种基于布尔运算的黑白图像(2,n)秘密共享方案,具有较低的计算复杂度,无像素膨胀,对照度为1/2.文中构造了黑白图像的r轮(2,n)秘密共享方案,提高了Wang等人方案的对照度;采用两种不同的方法构造了灰度图像和彩色图像的(2,n)秘密共享方案.文中所构造的方案计算复杂度低,重构密图的对照度高,并且当r较大时,接近精确重构.
The secret sharing scheme (SS) based on polynomial interpolation can accurately reconstruct the secret information, but its computational complexity is high.Visual point-and-share scheme (VSS) reconstructs the secret information by human visual effect without the need of password calculation, but there are pixels Swelling and contrast loss.Wang et al proposed a black-and-white image (2, n) secret sharing scheme based on Boolean operation with lower computational complexity and no pixel expansion with a contrast of 1/2. (2, n) secret sharing scheme of black-and-white image, which improves the contrast of Wang et al’s scheme and constructs the (2, n) secret sharing scheme of gray image and color image by two different methods. The proposed scheme has a low computational complexity and a high degree of contrast of reconstructed ciphers, and when r is large, it approaches the exact reconstruction.