The improved reflectance prediction model for printing dot was established with the Monte Carlo method. Reflectance model is a useful approach to predict and control printing quality, which was widely used in color duplication field. The Monte Carlo prediction model for printing dot is a simulation model, satisfying industrial virtual reality needs, which could simulate reflectance data as well as dot shape image. This paper mainly focuses on improving the existing reflectance model for printing dot with simulation program, expanding dot simulation area from one single dot to nine dots. The results showed that the reflectance value closely approached the measured value with high dot area in particular and the correlation coefficient improved to 0.924. 100,000 times was shown to be the optimal number of simulated photon under regular printing condition. The expanding simulation area could significantly eliminate interactive influence among the dots. The photon distribution and dot shape could be sufficiently simulated through this model, providing a reference for quality control. The results indicate that the improved reflectance model increased the reflectance accuracy and could further promote optical study about color duplication.

采用蒙特卡罗方法建立了改进的印刷网点反射率预测模型。反射率模型是一种预测和控制印刷质量的有效方法，广泛应用于套色领域。印刷网点的蒙特卡罗预测模型是一种模拟模型，满足工业虚拟现实需求，既可以模拟反射率数据，也可以模拟网点形状图像。本文主要通过仿真程序改进现有的打印网点反射率模型，将网点仿真范围从单个网点扩大到九个网点。结果表明，特别是高点面积的反射率值与实测值非常接近，相关系数提高到0.924。100, 000次被证明是常规打印条件下的最佳模拟光子数。扩大的模拟区域可以显着消除点之间的交互影响。通过该模型可以充分模拟光子分布和网点形状，为质量控制提供参考。结果表明，改进后的反射率模型提高了反射率精度，可以进一步促进对颜色重复的光学研究。