基于光谱的颜色喷墨再现关键问题研究

发布时间：2018-01-15 16:26

本文关键词：基于光谱的颜色喷墨再现关键问题研究　出处：《武汉大学》2013年博士论文　论文类型：学位论文

【摘要】：基于光谱的色彩再现可以降低传统色彩再现方式所固有的同色异谱问题的程度,实现设备无关、场景无关、观察者无关的无条件色彩再现,从而对原稿色彩信息进行真实客观的复制。本论文以基于光谱的颜色喷墨再现为研究对象,从打印机拆分式建模、墨量限制算法设计、正向光谱预测建模、光谱色域映射算法设计、反向光谱分色建模、建模度量优化等方面,对基于光谱的颜色喷墨再现进行了系统的研究,提出了一套完整的基于光谱的颜色喷墨再现方法,并以若干典型色彩样本集作为案例对其色彩再现精度进行了验证,取得了较为理想的结果。 1)依据颜色科学基本理论,对传统色彩再现方法的固有问题进行了深入分析,并在此基础上对光谱色彩再现的理论优势及其技术体系结构进行了详细论述。随后,对基于光谱的颜色喷墨再现领域的研究内容、研究现状等问题进行了较为全面的介绍。 2)通过具体实验的设计,对研究所构建的颜色喷墨再现系统中打印及测量设备的准确性及稳定性进行了量化表征。提出了一种基于光谱色域最大化思想的打印机拆分式建模方法,实现了打印机建模过程的简化。 3)针对打印过程中存在的墨量超限问题,提出了一种基于高维非线性插值的墨量限制算法。通过计算分析与显微观察相结合的方法,实现墨量阈值的准确判断,并在此基础上通过算法参数的调节,在打印墨量精准限制的同时实现了打印色域的最大化。随后,从墨量限制过程的快捷性考虑,在该算法基础上提出了一种快速墨量限制算法,在色域最大化程度与算法便捷性之间实现折中。 4)针对打印机正向光谱预测建模问题,对现有半色调呈色经典模型及其代表性优化算法进行了实现与分析,并在此基础上提出了一种基于神经网络分区n值优化的建模优化方法,成功实现了目前半色调光谱预测领域精度最高的CYNSN (Celluar Yule-Nielsen Spectral Neugebauer)模型的优化。 5)通过具体实验,对于五类经典最优化算法在光谱分色方面的精度进行了比较与分析,并确立最优算法。随后,提出了一种基于色域判断的子打印机反向分色方法,实现了子打印机色域内色彩的准确再现。 6)依据色域判断思想,构建完成了基于打印机整体建模的色彩再现流程,并提出了相关光谱色域映射方法。分别以文物典型颜料色彩样本、标准色卡色彩样本、印刷色彩样本等为例,以光谱误差为建模度量,实现了高精度的光谱色彩再现。最后,从人眼视觉角度出发,提出了一种基于混合建模度量的色彩再现方法,在光谱再现精度略有下降的情况下,实现了色度精度的显著提高,并依据上述内容对基于光谱的色彩再现在降低同色异谱程度方面的合理性进行了解释。
[Abstract]:The color reproduction based on spectrum can reduce the degree of homochromatic heterospectral problem inherent in the traditional color reproduction mode, and realize the unconditional color reproduction without equipment independence, scene independence and observer independence. In this paper, color inkjet reproduction based on spectrum is taken as the research object, from printer split modeling, ink limit algorithm design, forward spectral prediction modeling. Spectral gamut mapping algorithm design, reverse spectrum color separation modeling, modeling metrics optimization and other aspects, spectral color inkjet reproduction based on a systematic study. A complete method of color inkjet reproduction based on spectrum is proposed, and some typical color samples are used as examples to verify the accuracy of color reproduction, and the results are satisfactory. 1) based on the basic theory of color science, the inherent problems of traditional color reproduction methods are deeply analyzed. On this basis, the theoretical advantages of spectral color reproduction and its technical architecture are discussed in detail. Then, the research content of color inkjet reproduction based on spectrum is discussed. The current situation of the research and other issues are introduced in a more comprehensive way. 2) through the design of concrete experiment. The accuracy and stability of the printing and measuring equipment in the color inkjet reproduction system constructed by the Institute are quantitatively characterized. A printer split modeling method based on the idea of maximizing the spectral color gamut is proposed. The process of printer modeling is simplified. 3) aiming at the problem of ink quantity exceeding limit in printing process, a method of ink quantity limitation based on high dimensional nonlinear interpolation is proposed, which combines calculation and analysis with microscopic observation. On the basis of the adjustment of the algorithm parameters, the printing color gamut is maximized while the ink amount is accurately limited. Then, considering the quickness of the ink quantity limitation process. On the basis of this algorithm, a fast ink limitation algorithm is proposed, which can achieve a compromise between the maximum color gamut and the convenience of the algorithm. 4) aiming at the problem of printer forward spectral prediction modeling, the existing classic halftone color model and its representative optimization algorithm are implemented and analyzed. On this basis, a modeling optimization method based on n-value optimization of neural network partition is proposed. CYNSN Celluar Yule-Nielsen Spectral Neugebauer, which has the highest precision in halftone spectral prediction, has been successfully implemented. Optimization of the model. 5) through specific experiments, the accuracy of five classical optimization algorithms in spectral color separation is compared and analyzed, and the optimal algorithm is established. A reverse color separation method based on color gamut judgment is proposed, which can accurately reproduce the color in the color gamut of the sub-printer. 6) based on the idea of color gamut judgment, the color reproduction process based on the whole model of printer is constructed, and the related spectral gamut mapping method is proposed. Standard color card color samples, printing color samples for example, the spectral error as a modeling metric to achieve a high-precision spectral color reproduction. Finally, from the point of view of human vision. A color reproduction method based on hybrid modeling metric is proposed. The accuracy of chrominance is greatly improved when the precision of spectral reproduction is slightly reduced. According to the above contents, the rationality of color reproduction based on spectrum in reducing the degree of iso-chromatic and heterospectral spectrum is explained.
【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TP334.83

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