中文摘要：

目的针对调幅和调频加网在本质上的不同,过渡区域容易出现网点衔接不平滑和不均匀,造成明显跳变,影响印刷品质量的问题,提出一种基于阶调划分的网点重组型复合半色调算法。方法在分析复合半色调阶调划分思想的基础上,提出了一种过渡区域网点重组方法,通过建立过渡区域平滑衔接模型,构建了网点重组算法模型和分配方案,列举了几个典型实例,并对算法模型的效果进行了定量分析。结果生成的过渡区域网点实现了调幅和调频等2类不同性质网点的平滑过渡,提高了半色调图像的输出质量。结论提出的算法能够改善复合半色调图像的印刷质量,消除过渡区域的视觉干扰,是一种有效的半色调方法,为网点生成方法提供了参考依据。

英文摘要：

This research aimed to realize the even and smooth dot combination in the transition tone which is critical to improve printing quality. As the screening essences of AM screening and FM screening are different, unevenness of dots would appear in the transition tone, which would cause apparent tone jump and influence printing products＇ quality. This paper put forward a dot-recombined hybrid halftoning algorithm based on tone division. On the basis of analyzing the idea of hybrid halftoning tone division, a dot recombination method in transition tone was brought forward. By setting up even combination model in transition tone, this paper founded the dot recombination algorithm model and distribution project,and then exemplified several typical models, and conducted quantitative analyses on algorithm effects, which provided reference for dot generation methods. Generated dots in transition zone can realize smooth transition between two types of dots, which improved the output quality of halftone image. Algorithm in this paper can improve printing quality of hybrid halftone image and eliminate visual disturbance. It is an effective method, which can provide reference for dot generating.