基于光谱色域最大化的喷墨打印墨量限制方法研究

为了在解决墨量超限问题的同时实现喷墨打印设备色彩再现色域的最大化，提出了一种基于多维非线性插值的墨量限制方法。以四类不同介质的墨水组合为研究对象，以特殊设计的墨量评判样本墨层铺展情况为判断依据，确定最大色域样本集，并利用分光光度计测量获取各样本在380～730 nm波段的光谱反射率信息。通过主成分分析法对光谱数据进行降维处理，结合凸包算法，实现设备最大色域的数学建模表达及可视化分析。实验结果表明，本文提出的墨量限制算法，在解决喷墨打印墨量超限问题的同时，其光谱、 色度及设备色空间的最大色域覆盖率皆大于95%，说明此方法在高保真色彩复制的墨量限制环节具有较为理想的表现。

Study on Ink Restriction of Ink-Jet Printing Based on Spectral Gamut Maximization

In order to avoid the ink spilling problem and make full use of the color reproduction ability of the printer simultaneously, a novel multi-dimensional nonlinear interpolation ink restriction method based on spectral gamut maximization is proposed. Four ink-paper combinations were studied and the maximum gamut was determined judging from the ink holding performance of the specially designed printed samples whose spectral reflectance ranging from 380 to 730 nm was acquired by a spectrophotometer. The principal component analysis (PCA) method was employed to reduce the dimension of the spectral data and the convex hull algorithm was used to visualize and model the maximum gamut of each printing system. The research shows that the proposed ink restriction method can solve the ink spilling problem perfectly, meanwhile, the maximum gamut covering ratios of each ink-restricted gamut are higher than 95%, no matter calculated in spectral, colorimetric or device color space. Therefore, this research provides a reliable and accurate ink restriction method for the ink-jet printing industry.