目的 研究多通道半色调信息隐藏技术，通过相位调制技术，使彩色隐藏信息隐藏于不同色调的母版当中。方法 在基础层，基于最小阈值矩阵原理，使用基于相位调制阈值矩阵加网技术定位各通道隐藏信息位置，并在母版中对正常图像部分网点的生长趋势进行改变，实现在位置上的调制，从而保证各通道信息良好的隐蔽性。结果 使用相位调制技术可以达到多通道信息的隐蔽，达到彩色信息隐藏的预期效果。结论 该技术有利于提高半色调加网信息隐藏技术在印刷防伪中的应用范围，提高半色调加网信息隐藏技术的防伪性能。

This thesis focuses on multichannel halftone information hiding technology which can hide information into different shades of color master by phase modulation techniques. Depending on minimum threshold value matrix principle, the plus network screening technology based on phase modulation threshold value matrix was used in the base layer to position each channel of which the information was hidden in location. Besides, it's growth trend for the normal image part dot in mother board was changed to achieve modulation in location and thus to get good hiding conditions for each channel information. The results showed that the use of phase modulation technology could hide multichannel information and further achieve the desired effect of color information concealment. Therefore, it can expand the application of halftone screening information hiding technology in printing security and improve the security performance of information hiding techniques.