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    题名: 演色性評估之相關性指標Correlation;Index for Evaluation of Color Rendition
    作者: 陳建成;Chien-Chen Chen
    贡献者: 光電科學研究所
    关键词: 演色性;相關性;主成分分析;correlation;principal component analysis;color rendition
    日期: 2005-06-28
    上传时间: 2009-09-22 10:29:39 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 雖然在CIE的方式外,仍有許多評估演色性質的方法,由CIE提出的CRI仍然是最廣為利用且是目前唯一國際通用的方法,但事實上卻存在著許多本質上的問題。 本文提出以線性相關係數(Linear Correlation Coefficient)為基礎的新評估方式,試圖解決現今演色性根本的問題。其中,採用fundamental metamer 的觀念與 Matrix-R 的計算方式來得到光譜直流的成分。此外,利用Munsell Book of Colors 各色塊之間的等色覺差異的特性,做為新評估指標的建立標準。從中並發現 fundamental metamer的線性相關係數與Munsell hue、value、chroma存在著特定的關聯性,且已在分析上得到極佳的驗證。另外,在取樣測量色塊顏色與數量的決定上,採用了主成分分析(PCA)來得到色塊樣本的獨立子空間,此獨立子空間代表了色塊樣本實際有用的光譜資,且在與前述fundamental metamer之線性相關係數的合併架構中,此結果經與CIEDE2000的對應結果顯示,在評估演色性上,此架構確實可行,而且具有相當的客觀性。 Up to date, there are a lot of evaluation methods for rating the color rendition having been proposed. Among them, the CRI recommended by CIE is the most utilized withinthe lighting community, and is the only internationally agreed metric currently. However,some intrinsic drawbacks do make those evaluation methods inactive in certain special cases. In this thesis, the basic concept of the Linear Correlation Coefficient has been proposed to solve the fundamental problems of color rendering. In calculating the linear correlation coefficient, the fundamental metamer and the Matrix-R have been applied for obtaining the invariant components of the spectrum. Besides, the chips of Munsell Book of Colors are also adapted for the requirement of the sample set with equal perceptual distance. It is found that there exists certain relation between the Linear Correlation Coefficient of the obtained fundamental metamers and Munsell hue, value, and chroma. Some preliminary fitting models for the specific relation has been established and proved to work very well. Finally, as considering the least number of samples of the specified data set, the well known Principal Component Analysis, which is the important and useful tool in color technology, was used to find the independent subspace which the specified sample data set actually localize. i.e. the truly useful spectral information of a specified sample data set. As compared with the result from CIEDE2000, the proposed scheme of the process in this thesis is really practical and very feasible.
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