利用反转实现理想对比度的密图分存

可视秘密共享的一个主要不足是重构后图像的对比度损失严重.提出了利用反转实现理想对比度的密图分存方案.编码轮数为m/h(上取整) (m和h分别是白像素加密所用基阵全部列和全白列的数量),采取像素块编码方式,每步都将m个连续相同的像素进行一次性加密编码,不产生像素扩展.对方案的正确性和安全性进行了证明,并与类似方案进行了对比分析和实验.该方案编码效率较高,系统容量较小.

Ideal Contrast Secret Image Sharing Using Reversing

In visual secret sharing(VSS) schemes,the contrast of reconstructed image is much lost.A novel VSS scheme with reversing is presented.It can achieve really ideal contrast within(the ceiling integer of) m/h encoding runs,where m and h are respectively the number of all columns and the number of whole-white columns in the basis matrix for white pixels encoding.It encodes a secret image block by block and no pixel expansion occurs.A block consists of consecutive m pixels with same type,which means that m pixel...