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基于多项式回归模型的扫描仪色度特征化
引用本文:王勇,徐海松.基于多项式回归模型的扫描仪色度特征化[J].光学学报,2007,27(6):135-1138.
作者姓名:王勇  徐海松
作者单位:浙江大学现代光学仪器国家重点实验室,杭州,310027
摘    要:为了实现扫描仪精确的色度特征化,详细研究了多种不同项数、不同变换类型多项式回归模型,多项式的项数分别为3,5,9,11,18和20,变换类型包括扫描仪RGB空间到CIEXYZ或CIELAB空间的多种变换。以ANSIIT8.7/2标准色卡为色靶,对同一台扫描仪进行了色度特征化。实验结果表明,多项式项数小于11时,不同类型模型间的精度差异大,且线性化RGB能提高模型精度;项数大于11时,模型间精度差异缩小,而线性化RGB反而会降低模型精度。实验中,多项式项数为20时的RGB到CIEXYZ变换模型特征化精度最好,平均色差和最大色差分别为0.832和2.988 CIELAB色差单位。

关 键 词:色度学  色度特征化  多项式回归  扫描仪
文章编号:0253-2239(2007)06-1135-4
收稿时间:2006/8/8
修稿时间:2006-08-08

Colorimetric Characterization for Scanner Based on Polynomial Regression Models
Wang Yong,Xu Haisong.Colorimetric Characterization for Scanner Based on Polynomial Regression Models[J].Acta Optica Sinica,2007,27(6):135-1138.
Authors:Wang Yong  Xu Haisong
Institution:State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027
Abstract:In order to realize accurate colorimetric characterization for a scanner,several polynomial regression models with different number of items and different conversion types were evaluated.The items of polynomial included 3,5,9,11,18 and 20,and the conversion types consisted of manifold transformation from scanner RGB space to standard CIEXYZ or CIELAB colorimetric space.An identical scanner was colorimetrically characterized with these polynomial models utilizing ANSI IT8.7/2 as color targets.Experimental results showed that the performance of these models were quite different and the linearization of scanner RGB signals improved the model accuracy when the items of polynomial were less than 11,while the differences disappeared and the linearization decreased the model accuracy along with the items more than 11.In this experiment,the polynomial conversion from raw scanner RGB to CIEXYZ with 20 items gave the best performance with the mean/maxmium color defferences of 0.832/2.988 CIELAB units.
Keywords:colorimetry  colorimetric characterization  polynomial regression  scanner
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