In an earlier paper [1], we propose a high capacity data hiding scheme for various types of binary images. The scheme ensures that in an M×N image block, the upper bound of the amount of bits that can be embedded is [nlog_2((M×N)/n + 1)] by changing at most n individual pixels. However, changing individual pixels in halftone images will introduce undesirable 'salt-and-pepper' noise, or local black or white clusters. In this paper, we propose a new scheme for halftone images which improves [1] in its capability to maintain better quality of the host image after data hiding by changing pixels in pairs rather than individually. The new scheme can still offer a high embedding efficiency. Experimental results show that the new scheme can maintain better image quality.
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机译：在早期纸张[1]中，我们提出了一种用于各种类型的二进制图像的高容量数据隐藏方案。该方案确保在M×N图像块中，通过更改至多n个单独的像素，可以嵌入的比特量的上限是[NLOG_2（（m×n）/ n + 1）]。然而，改变半色调图像中的各个像素将引入不期望的“盐和胡椒”噪音，或局部黑色或白色簇。在本文中，我们提出了一种用于半色调图像的新方案，其能够在其能力中提高[1]，以便在通过成对而不是单独改变像素的数据隐藏后保持更好的主机图像质量。新方案仍然可以提供高嵌入效率。实验结果表明，新方案可以保持更好的图像质量。
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