桌面喷墨打印机的颜色特性化研究

发布时间：2018-01-29 00:57

本文关键词： 桌面喷墨打印机颜色空间前向特性化逆向特性化分色呈色多光谱图像　出处：《浙江大学》2012年硕士论文　论文类型：学位论文

【摘要】：桌面喷墨打印机是日常生活中重要的颜色再现设备,其颜色特性化包括两个主要部分：打印机的前向特性化,即建立与设备相关的RGB颜色空间到与设备无关的光谱或色度之间的转换；打印机的逆向特性化,即建立已知的反射光谱到RGB颜色空间的转换,以尽可能准确的再现颜色的光谱或色度。相对来说,逆向模型对于实际应用更有价值。论文首先根据物理混色原理建立前向打印模型,分析了打印机内的墨水分色过程和介质上的呈色过程。对于呈色过程,分别采用基于简单点增益的YNSN模型和基于复杂点增益的改进型YNSN模型。并通过非线性优化求解分色过程中图像RGB对应的CMYK喷墨量,并建立两者间的多项式回归关系。论文还采用三维查找表法和局部多项式回归法实现打印机的前向颜色特性化。最后提出了一种六邻域局部空间算法,通过权重参数和幂因子的优化,进一步提高了算法精度。在研究逆向打印模型时,首先采用单光源多项式回归法建立CIEXYZ到RGB空间的映射关系,实现了在本光源下的精确颜色再现,但其在不同光源下未能获得较好效果。为此,本论文最后提出了一种局部空间数值优化方法,通过参数的优化,进一步提高了逆向模型的算法精度,实现了多光谱图像的高保真打印。
[Abstract]:Desktop inkjet printer is an important color reproduction device in daily life. Its color characterization includes two main parts: forward characterization of printer. The conversion between the RGB color space associated with the device and the spectrum or chromaticity independent of the device; The reverse characterization of the printer, that is, the conversion of the known reflection spectrum to the RGB color space, in order to reproduce the spectrum or chroma of the color as accurately as possible. Reverse model is more valuable for practical application. Firstly, according to the principle of physical color mixing, the forward printing model is established, and the process of ink separation in printer and the process of color generation in medium are analyzed. The YNSN model based on simple point gain and the improved YNSN model based on complex point gain are adopted, respectively, and the CMYK inkjet amount corresponding to the image RGB in the process of color separation is solved by nonlinear optimization. The polynomial regression relationship between them is established. The forward color characteristic of printer is realized by using 3D lookup table method and local polynomial regression method. Finally, a six-neighborhood local space algorithm is proposed. Through the optimization of weight parameters and power factors, the accuracy of the algorithm is further improved. In the research of reverse print model, the mapping relationship between CIEXYZ and RGB space is established by polynomial regression method of single light source, and the accurate color reproduction is realized under this light source. However, it can not get better results under different light sources. Therefore, a numerical optimization method of local space is proposed in this paper, which improves the accuracy of the inverse model further through the optimization of parameters. The high fidelity printing of multispectral image is realized.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP334.83

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