本文關鍵詞：基于光譜的顏色噴墨再現(xiàn)關鍵問題研究　出處：《武漢大學》2013年博士論文　論文類型：學位論文

  更多相關文章： 光譜再現(xiàn) 色域 打印機拆分 墨量限制 光譜預測 光譜分色 建模度量

【摘要】：基于光譜的色彩再現(xiàn)可以降低傳統(tǒng)色彩再現(xiàn)方式所固有的同色異譜問題的程度,實現(xiàn)設備無關、場景無關、觀察者無關的無條件色彩再現(xiàn),從而對原稿色彩信息進行真實客觀的復制。本論文以基于光譜的顏色噴墨再現(xiàn)為研究對象,從打印機拆分式建模、墨量限制算法設計、正向光譜預測建模、光譜色域映射算法設計、反向光譜分色建模、建模度量優(yōu)化等方面,對基于光譜的顏色噴墨再現(xiàn)進行了系統(tǒng)的研究,提出了一套完整的基于光譜的顏色噴墨再現(xiàn)方法,并以若干典型色彩樣本集作為案例對其色彩再現(xiàn)精度進行了驗證,取得了較為理想的結果。 1)依據(jù)顏色科學基本理論,對傳統(tǒng)色彩再現(xiàn)方法的固有問題進行了深入分析,并在此基礎上對光譜色彩再現(xiàn)的理論優(yōu)勢及其技術體系結構進行了詳細論述。隨后,對基于光譜的顏色噴墨再現(xiàn)領域的研究內容、研究現(xiàn)狀等問題進行了較為全面的介紹。 2)通過具體實驗的設計,對研究所構建的顏色噴墨再現(xiàn)系統(tǒng)中打印及測量設備的準確性及穩(wěn)定性進行了量化表征。提出了一種基于光譜色域最大化思想的打印機拆分式建模方法,實現(xiàn)了打印機建模過程的簡化。 3)針對打印過程中存在的墨量超限問題,提出了一種基于高維非線性插值的墨量限制算法。通過計算分析與顯微觀察相結合的方法,實現(xiàn)墨量閾值的準確判斷,并在此基礎上通過算法參數(shù)的調節(jié),在打印墨量精準限制的同時實現(xiàn)了打印色域的最大化。隨后,從墨量限制過程的快捷性考慮,在該算法基礎上提出了一種快速墨量限制算法,在色域最大化程度與算法便捷性之間實現(xiàn)折中。 4)針對打印機正向光譜預測建模問題,對現(xiàn)有半色調呈色經(jīng)典模型及其代表性優(yōu)化算法進行了實現(xiàn)與分析,并在此基礎上提出了一種基于神經(jīng)網(wǎng)絡分區(qū)n值優(yōu)化的建模優(yōu)化方法,成功實現(xiàn)了目前半色調光譜預測領域精度最高的CYNSN (Celluar Yule-Nielsen Spectral Neugebauer)模型的優(yōu)化。 5)通過具體實驗,對于五類經(jīng)典最優(yōu)化算法在光譜分色方面的精度進行了比較與分析,并確立最優(yōu)算法。隨后,提出了一種基于色域判斷的子打印機反向分色方法,實現(xiàn)了子打印機色域內色彩的準確再現(xiàn)。 6)依據(jù)色域判斷思想,構建完成了基于打印機整體建模的色彩再現(xiàn)流程,并提出了相關光譜色域映射方法。分別以文物典型顏料色彩樣本、標準色卡色彩樣本、印刷色彩樣本等為例,以光譜誤差為建模度量,實現(xiàn)了高精度的光譜色彩再現(xiàn)。最后,從人眼視覺角度出發(fā),提出了一種基于混合建模度量的色彩再現(xiàn)方法,在光譜再現(xiàn)精度略有下降的情況下,實現(xiàn)了色度精度的顯著提高,并依據(jù)上述內容對基于光譜的色彩再現(xiàn)在降低同色異譜程度方面的合理性進行了解釋。
[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.
【學位授予單位】：武漢大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TP334.83

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