The Relationship Between the Propagation Distance Coefficient and the Wavelength in the Long and Short Distance Clapper-Yule Model
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摘要: 分程Clapper-Yule模型中的分程系数描述了光线在半色调印刷品中横向传播时进行短程传播的比例,通常被认为是常数。利用单色油墨网点梯尺的光谱反射率测量值以及由密度法获得的有效网点面积率,拟合出单色半色调样品的分程系数曲线,发现分程系数实际上是基于波长的函数,引入分程函数对分程Clapper-Yule模型进行了修正,并初步探讨了分程函数与油墨和纸张光学特性之间的关系。实验结果证明,修正后的分程Clapper-Yule模型具有更好的光谱反射率预测精度。
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关键词:
- 分程Clapper-Yule模型 /
- 分程系数 /
- 半色调印刷品
Abstract: The propagation distance coefficient in the long and short distance Clapper-Yule model represents the probability of incident light propagating laterally along the short and middle distance in halftone prints. In previous works,it was considered as a constant. Based on the spectral reflectance of single ink halftone gradients measured and the actual dot area coverage calculated by using the density method,the relationship between the propagation distance coefficient and the wavelength was studied,the propagation distance coefficient as a function of the wavelength was demonstrated, the long and short distance Clapper-Yule model was improved by using the propagation distance function fitting,and the preliminary analysis on the interaction between the propagation distance function and the optical characteristics of inks and papers was provided. The results of experiments show that enhanced model can more accurately predict the spectral reflectance of single ink halftone print.-
Key words:
- analytic hierarchy process /
- optical character recognition /
- calculations
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