尤尔-尼尔逊公式的理论误差探悉  

Probing into Yule-Nielsen Formula's Theoretical Errors

作　　者：成刚虎[1] 王文杰[1] 

机构地区：[1]西安理工大学印刷包装工程学院,陕西西安710048

出　　处：《西安理工大学学报》2012年第1期67-71,共5页Journal of Xi'an University of Technology

基　　金：陕西省教育厅专项科研计划研究项目(2010JK706)

摘　　要：默里-戴维斯公式以及尤尔-尼尔逊公式都可以确定网点密度与网点面积率的关系,常在计算网点面积率、分析网点扩大、进行工艺参数识别(制版时的曝光控制、印刷时的压力调节等)与优化等工艺实践中应用广泛。实践中人们更趋于应用后者,认为其结果更接近现实。针对这一认识误区,通过理论分析和仿真实验,揭示了尤尔-尼尔逊公式存在理论误差,在不考虑工艺因素影响下,该公式只在极少数密度点无计算误差,在其余点均存在非线性误差。Murray-Davies and Yule-Nielsen formula can confirm the relationship between the dot density and dot area ratio,it is used widely to formulate dot area ratio,analyze dot gain,distinguish the technological parameter（exposure control in plate making,express pressure adjustment in printing）and optimizing.In practice,the people prefer to the latter and regard the result as the reality.But this paper via theoretical analysis and simulated experiment reveals that there exist theoretical errors in Yule-Nielsen formula,and in the case of non-considering the technological element influence,there exist no calculation errors in only a few density dots,and there exist the nonlinear errors in the rest of other dots.

关 键 词：网点密度 网点面积率 尤尔-尼尔逊公式 默里-戴维斯公式 

分 类 号：TS801.3[轻工技术与工程] TP3[自动化与计算机技术—计算机科学与技术]