通过研究恒权码与(2,n)视觉密码方案的关系,利用steiner系统构造恒权码,提出了基于恒权码的(2,n)视觉密码方案,在证明其存在性的同时,给出了该方案的构造方法。与现有方案相比,能较好地折衷像素扩展度和相对差。实验结果表明,该方案在保证相对差接近极大值的前提下,大大降低了像素扩展度。 By studying the relationship between (2, n) visual cipher scheme and the constant code, the steiner system is used to construct the constant code, and a (2, n) visual cipher scheme based on the constant code is proposed. Out of the program’s construction method. Compared with the existing scheme, the pixel expansion and the relative difference can be better compromised. Experimental results show that the proposed scheme can greatly reduce the pixel extension under the premise of ensuring that the relative difference approaches the maximum value.