Author: |
陳怡君 Chen Yi-Chun |
---|---|
Thesis Title: |
自然影像中複合光源之分析研究 A Study on the Analysis of Multiple Illuminants in a Natural Image |
Advisor: |
周遵儒
Chou, Tzren-Ru |
Degree: |
碩士 Master |
Department: |
圖文傳播學系 Department of Graphic Arts and Communications |
Thesis Publication Year: | 2009 |
Academic Year: | 97 |
Language: | 中文 |
Number of pages: | 131 |
Keywords (in Chinese): | 物體反射譜 、光源 、色域 |
Keywords (in English): | Spectral reflectance, Illuminant, Color gamut |
Thesis Type: | Academic thesis/ dissertation |
Reference times: | Clicks: 204 Downloads: 16 |
Share: |
School Collection Retrieve National Library Collection Retrieve Error Report |
影像拍攝過程中,由於環境光源的影響易導致物體呈現不同的色彩,無法忠實地表現物體真實的顏色,使得無法辨識影像內物體與真實物體是否相同,因此,若欲呈現真實地色彩則必須控制環境光源。於環境光源控方面,可分為事前花費大筆成本建構標準拍攝環境空間;另外一方面,則可透過事後的色彩技術,估計其拍攝時環境光源進而還原出物體色彩。
本研究欲開發一套複合光源的分析方法:首先,本研究藉由色彩比例值進行物體反射譜的模擬。其次,在單一光源估計方面,透過色域極限點光源偵測法與不變色光源偵測法,將欲估計自然影像經過色彩空間轉換,根據與參考色位置的距離計算,找出該參考色對應到的光源,進而估計當時物體拍攝時的環境光源。最後,在複合光源分析方面,將運用影像分割判斷出影像中主光源的可能性。
希望藉由實驗結果,提高影像顯示的準確性,此結果預計將可應用於影像合成、數位典藏、醫學影像等數位影像後製過程,透過色彩修正處理,促使影像更符合真實現象。
The impact of environmental light source leads into the object show a different color in the process of capture. That can not be faithful performance of the real color. So we can not know the object of image and the real object whether the same. Therefore, if we want to present true color, we must control environmental light source. That can spend substantial costs to construct standards environment space of capture before shooting, or through the color technology after shooting to estimate environment light source to further restore color of objects.
This study aimed to develop a method of analysis of multiple illuminants. First of all, we simulated spectral reflectance of objects that used by the proportion of color. Secondly, two methods of single illuminant estimation were derived, including gamut extreme light estimation and invariant color light estimation. We used the natural image via color space conversion to estimate single illuminant by calculating distance form the reference color. Finally, in the analysis of multiple illuminants, we used image segmentation to understand it changing circumstances then making out the main illuminant in the image.
We hope through experimental results improve the accuracy of image display. These results will be applied to color amendments of synthesis image, digital archives, medical imaging and other digital image post-production process to make it be more natural and more coordinative.
[1] M.J. Shyu, J. Y. Wang, and C.Y. Chen, “A Preliminary Study of Multi-Spectral Image Capturing for Oriental Water Color Painting,” The 9th International Symposium on Multispectral Colour Science and Application, pp.117-122, 2007.
[2] V. Bochko, N. Tsumura, and Y. Miyake, “A Spectral Color Imaging System for Estimating Spectral Reflectance of Paint,” Journal of Imaging Science and Technology, Vol.51, No.1, pp.70-78, 2007.
[3] 諸葛慧(2006)。色溫調整影像合成技術之研究。國立台灣師範大學圖文傳播學系碩士論文。
[4] 大田 登著/陳鴻興、陳詩涵合譯 (2007)。 色彩工程學:理論與應用。台北:全華圖書股份有限公司。
[5] International Organization for Standardization, “CIELAB Standard Colour Image Data,” ISO 12640-3, 2007.
[6] B. Hill, “The History of Multispectral Imaging at the University of Aachen,” University of Aachen, 2005.
[7] 西堀真宏、渡邊憲、宮崎安洋、田中直文、荒川真一、千葉由美、二宮彩子、西堀真宏、大喬久美子、田中博、上村健二、宮田公佳、中口俊哉、津村德道、三宅洋一、滝脇弘嗣、鬼頭伸一郎、洪博哲、橋本憲幸,”マルチスペクトルイメージングの医療応用,” 医療情報学, Vol.25, No.3, pp.161-166, 2005.
[8] 三宅洋一、羽石秀昭、津村徳道、杉浦博明、久野徹也、林純一郎、石倉一智、千崎岳夫、原田良男, “偏角分光イメージングに基づく高精細質感情報記録再現システムの開発,”情報処理推進機構, 2003.
[9] M.J. Vrhel and H.J. Trussell, “Color Correction Using Principal Components,” Color Research and Application, Vol.17, No.5, pp.328-338, 1992.
[10] M.J. Vrhel, R. Gershon, and L.S. Iwan, “Measurement and Analysis of Object Reflectance Spectra,” Color Research and Application, Vol.19, No.2, pp.4-9, 1994.
[11] L.T. Maloney,” Evaluation of Linear Models of Surface Spectral Reflectance with Small Numbers of Parameters,” Journal of the Optical Society of America A, Vol.3, No.10, pp.1673-1683, 1986.
[12] 津村徳道、羽石秀昭、三宅洋一,”重回帰分析によるマルチバンド画像からの分光反射率の推定,” 光学,Vol.27, No.7, pp.384-391, 1998.
[13] A. Mansouri, T. Sliwa, J. Y. Hardeberg, and Y. voisin, “ Spectral Reflectance Estimation using Wavelet Basis Decomposition,” The 9th International Symposium on Multispectral Colour Science and Application, pp.136-141, 2007.
[14] S. Westland and C. Ripamonti, Computational Colour Science using Matlab, John Wiley & Sons lnc., 2004.
[15] M.J. Vrhel and H.J. Trussell, “Filter Considerations in Color Correction,” IEEE Transactions on Image Processing, Vol.2, No.3, pp.147-161, 1994.
[16] K. Takase, N. Tsumura, T. Nakaguchi, and Y. Miyake,” Fast Estimation Algorithm for Calculation of Reflectance Map Based on Wiener Estimation Technique,” Optical Review, Vol.12, No.1, pp.20-24, 2005.
[17] M. Stokes, M. Anderson, S. Chandrasekar, and R. Motta,
“ A Standard Default Color Space for the Internet ─ sRGB,” http://www.w3.org/Graphics/Color/sRGB,1996.
[18] T.R. Chou and Y.C. Chen, “ Estimation and Simulation of Color Temperature in Complex Images Using Gamut Extremes,” The 9th International Symposium on Multispectral Colour Science and Application, pp.103-108, 2007.
[19] 周遵儒、陳怡君, ”色溫估計之色域極限點效果評估,” 2007色彩學研討會論文集, pp.113-120, 2007.
[20] S.A. Shafer, “Using Color to Separate Reflection Components,” Color Research and Application, Vol.10, No.4, pp.210-218, 1985.
[21] M. Störring, H. J. Andersen, and E. Granum, “ Estimation of the Illuminant Colour from Human Skin Colour,” Fourth IEEE International Conference on Automatic Face and Gesture Recognition 2000, pp.64-69, 2000.
[22] H.C. Lee,” Method for Computing Scene-illuminant Chromaticity from Specular Highlight,” Journal of the Optical Society of America A, Vol.3, No.10, pp.1694-1699, 1986.
[23] T.M. Lehmann and C. Palm, “Color Line Search for Illuminant Estimation in Real-world Scenes,” Journal of the Optical Society of America A, Vol.18, No.11, pp.2679-2691, 2001.
[24] S. Tominaga, S. Ebuisi, and B. Wandell, “Color temperature estimation of scene illumination,” Proceedings of the IS&T/SID Seventh Color Imaging Conference, pp.42-48, 1999.
[25] G.D. Finlayson and S.D. Hordley, “Color Constancy at a Pixel,” Journal of the Optical Society of America A, Vol.18, No.2, pp.253-264, 2001.
[26] 永田泰弘、三ッ塚由貴子(2007)。よくわかる 色彩の科学。東京:株式会社ナツメ社。
[27] N. Sandor and J. Schanda, ”Visual Colour-rendering Experiment,” AIC Colour 05: 10th Congress of the International Colour Association, pp.511-514, 2005.
[28] P. Green and L. Macdonald, “ Colour Enginerring: Achieving Device Independent Colour”, John Wiley & Sons lnc., pp.63-64,2002.
[29] WolframMathWorld, http://mathworld.wolfram.com, 2008.
[30] M. Freeman著/郭哲維、張宇翔、沈昶甫合譯(2007)。數位攝影徹底研究光影之部─採光、測光、補光與閃燈的完全應用。台北:旗標出版股份有限公司。
[31] Munsell Color Science Laboratory,http://www.cis.rit.edu/mcsl/online/cie.php, 2008.
[32] 一見敏男(1995)。グラフィック表現のための色彩学入門。東京:日本印刷新聞社。