目的 解决目前半色调加网的信息隐藏技术存在的隐藏效果不佳、易仿制等问题。方法 基于最小阈值矩阵加网原理，开发一种矩阵轮换加网算法，生成具有防伪意义的特殊形状网点，应用于半色调信息隐藏技术中。结果 该方法中特殊形状网点的生成，克服了传统网点进行信息隐藏时易出现的“断点”缺陷，提高了隐藏视觉不可见度，且网点形状根据矩阵设计的不同而变化，不易仿制，提高了防伪系数。结论 矩阵轮换加网生成特殊形状网点，对于半色调加网的信息隐藏技术在实际生产中应用具有较好的指导作用。

The work aims to solve the problem that the hiding effect is not good and the hiding information is easy to imitate regarding the information hiding technology of current halftone screening. Based on the principle of the minimum threshold matrix screening, a kind of matrix rotation screening algorithm was developed to generate the specially shaped dot applied in the halftone information hiding technology. The generation of specially shaped dot by the proposed method overcame the defect "breakpoint" of traditional dot likely to occur during information hiding. The hidden visual invisibility was improved, and the dot shape changed according to the matrix design. As it was not easy to imitate, the security coefficient was improved. The specially shaped dot generated by matrix rotation screening provides better guidance for the application of the information hiding technology of halftone screening in the actual production.