光学网点增大研究综述及网点面积率探讨

Review of Optical Dot Gain and Discussion of Dot Percentage

光学网点增大是网目调图像复制研究中的重点问题之一,几年来一直是众多学者关注的焦点,而光学网点增大机理复杂,建立光学网点增大计算模型是研究中的难点,也是近几年网点增大模型研究中的重点。本文综述了国内外关于光学网点增大研究的进展,重点介绍了Yule-Nielsen修正参数n修正法、基于基材的MTF测量法、点扩散函数与概率方法,以及墨层厚度比率法。并对如何理解各模型中的网点面积率进行了探讨,指出网点面积率在应用中应该注意的问题。

Optical dot gain is a practically important problem in the halftone reproduction and the focus of interest of many scholars.Because the mechanism of optical dot gain is complicated,estimating the calculated models of optical dot gain is difficult point and emphasis in dot gain model research in recent years.In this paper,the research situation of domestic and international optical dot gain was reviewed.The approaches including Yule-Nielsen parameter n,measure MTF of paper, point spread function and probability approach,ratio of ink-layer thickness,were introduced.Moreover,in-depth understanding dot percentage was discussed and the problems in applying dot percentage were pointed out.