聚集态网点阈值矩阵生成方法及潜在应用研究

目的对聚集态网点阈值矩阵的动态生成方法与算法,及潜在的应用问题进行分析与探讨。方法依据网点网格坐标系,建立网点函数阈值矩阵的生成方法以及网点灰度阈值矩阵的阈值动态分布原则,并得到网格内元素的阈值映射关系式。结果网格内元素的排布顺序越大,网格内获得的阈值就越大,通过对网点函数进行特殊处理,可使网点阈值矩阵的数据中心点相对于网格中心产生一定的偏移,形成具有特殊加网效果的阈值矩阵。结论在不影响图像外观的情况下,通过在网点函数中引入特殊的位相变化信息,加网时就能在图像预定区域生成含有特殊位相编码信息的网点分布,可为图像特定区域植入预期的有意义的编码信息,在图像复制、信息隐藏和印刷防伪等领域具有实际指导意义。

Building Method of Clustered Dot Threshold Matrixes and Its Potential Applications

Objective To investigate the method and algorithm for dynamically generating clustered dot threshold matrixes and its potential applications. Methods A method of building printing spot function threshold matrix, as well as the principle of threshold value distribution of the corresponding dot cell gray threshold matrix, were provided based on their dot cell coordinate system. Values of mapping relationships between elements of both threshold matrixes above were also clarified. Results Through special treatment of the printing spot function, the dot data in the center of threshold matrix was shifted to a certain degree with respect to the center of the grid, generating a threshold matrix with special screening effects. Conclusion By embedding dynamically expected meaningful information inside a special area of the halftone image without affecting the appearance of the image, a predetermined area was generated in the image containing a special phase encoding information of spot distribution after screening. The study has practical significance in the fields of image reproduction, information hiding and anti-counterfeiting.