本文關(guān)鍵詞： 桌面噴墨打印機(jī) 顏色空間 前向特性化 逆向特性化 分色 呈色 多光譜圖像　出處：《浙江大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：桌面噴墨打印機(jī)是日常生活中重要的顏色再現(xiàn)設(shè)備,其顏色特性化包括兩個(gè)主要部分：打印機(jī)的前向特性化,即建立與設(shè)備相關(guān)的RGB顏色空間到與設(shè)備無關(guān)的光譜或色度之間的轉(zhuǎn)換；打印機(jī)的逆向特性化,即建立已知的反射光譜到RGB顏色空間的轉(zhuǎn)換,以盡可能準(zhǔn)確的再現(xiàn)顏色的光譜或色度。相對(duì)來說,逆向模型對(duì)于實(shí)際應(yīng)用更有價(jià)值。 論文首先根據(jù)物理混色原理建立前向打印模型,分析了打印機(jī)內(nèi)的墨水分色過程和介質(zhì)上的呈色過程。對(duì)于呈色過程,分別采用基于簡(jiǎn)單點(diǎn)增益的YNSN模型和基于復(fù)雜點(diǎn)增益的改進(jìn)型YNSN模型。并通過非線性優(yōu)化求解分色過程中圖像RGB對(duì)應(yīng)的CMYK噴墨量,并建立兩者間的多項(xiàng)式回歸關(guān)系。論文還采用三維查找表法和局部多項(xiàng)式回歸法實(shí)現(xiàn)打印機(jī)的前向顏色特性化。最后提出了一種六鄰域局部空間算法,通過權(quán)重參數(shù)和冪因子的優(yōu)化,進(jìn)一步提高了算法精度。 在研究逆向打印模型時(shí),首先采用單光源多項(xiàng)式回歸法建立CIEXYZ到RGB空間的映射關(guān)系,實(shí)現(xiàn)了在本光源下的精確顏色再現(xiàn),但其在不同光源下未能獲得較好效果。為此,本論文最后提出了一種局部空間數(shù)值優(yōu)化方法,通過參數(shù)的優(yōu)化,進(jìn)一步提高了逆向模型的算法精度,實(shí)現(xiàn)了多光譜圖像的高保真打印。
[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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TP334.83

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本文編號(hào)：1472048