基于回归算法的印刷品最佳实地密度研究  

Best Solid Density of Print Based on Regression Algorithm

作　　者：郭凌华 王晶[1,2,3,4] 孙栗媛 温蕾 党玲玉 GUO Ling-hua;WANG Jing;SUN Li-yuan;WEN Lei;DANG Ling-yu(a.College of Bioresources Chemical and Materials Engineering ,b.National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi University of Science ＆ Technology,Xi＇an 710021,China;Key Laboratory of Paper Based Functional Materials of China National Light Industry,Xi＇an 710021,China;Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development,Xi＇an 710021,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,西安710021 [2]陕西科技大学轻化工程国家级实验教学示范中心,西安710021 [3]中国轻工业纸基功能材料重点实验室,西安710021 [4]陕西省造纸技术及特种纸品开发重点实验室,西安710021

出　　处：《包装工程》2018年第15期210-215,共6页Packaging Engineering

基　　金：2017年陕西省大学生创新创业训练计划(1306);2017年陕西省大学生创新创业训练计划(109);西安市科技计划2017068CGRC031(SXKD008);陕西省科技厅工业公关项目(2016GY-017;2016GY-079);宝鸡市科技计划(16KJHZI-2;16GYGG4-2);西安市未央区科技计划(201825)

摘　　要：目的从相对反差最大时密度最佳的角度出发,结合网点扩大,构建基于回归算法的数学模型,确定最佳的实地密度,从而提高印刷品的质量。方法获取过版样张,根据测量的实地密度、相对反差和网点扩大值作出三维坐标图,并基于回归算法建立相对反差K、网点扩大与实地密度函数关系的数学模型;利用该模型找到相对反差最大时,网点扩大和实地密度的参数匹配算法;网点扩大在国标范围(15%~20%)内,最终以方差最小原则确定最佳的实地密度。结果基于回归算法找到了当相对反差最大时实地密度和网点扩大的参数匹配符合函数y=ax+b,确定了C,M,Y,BK油墨的最佳实地密度分别为1.551,1.612,0.975,1.828。结论基于回归算法确定最佳实地密度的方法能够保证相对反差良好,网点扩大适宜,提高了印刷品的清晰度和鲜艳程度,对印刷的质量控制具有一定的指导意义。The work aims to construct a mathematical model based on regression algorithm to determine the best solid density by combining with the dot gain, thus improving the quality of print, regarding the fact that the density is the best when the relative contrast is the largest. The three-dimensional coordinate graph was obtained based on the solid density, relative contrast and dot gain value measured according to the proofs; and based on the regression algorithm, a mathematical model of the functional relationship between relative contrast K, dot gain and solid density was established. The model was used to find the parameter matching algorithm of dot gain and solid density when the relative contrast was maximal. When the dot gain was within 15%~20% of the national standard, the best solid density could be finally determined based on the minimum variance principle. The parameter matching of solid density and dot gain found based on the regression algorithm conformed to the function y=ax＋b when the relative contrast was maximal, and the best solid densities of C, M, Y, and BK inks were respectively 1.551, 1.612, 0.975 and 1.828. The method to determine the best solid density based on the regression algorithm can ensure good relative contrast and appropriate dot gain, and improve the clarity and vividness of the prints. It is of certain guiding significance for the printing quality control.

关 键 词：相对反差K 网点扩大 实地密度 

分 类 号：TS801.6[轻工技术与工程]