中文摘要：

多元回归法是彩色打印机特性化普遍采用的方法,实验对影响多元回归精度的阶数、色空间选择、以及训练样本选取进行了研究。研究结果表明：（1）二、三、四阶的特性化精度分别在10.9±0.3、6.6±0.2、6.0±0.2个CIELAB色差单位;（2）回归模型采用RGB到CIELAB或CIEXYZ的预测精度基本相同,大概相差1个CIELAB色差单位,但如果训练样本选择适当,两种色空间无差距;（3）训练样本的RGB取值要包括打印色域边界点0和255,这样将保证模型总体预测精度。研究结果将指导实际应用中回归阶数、色空间选择和训练样本的选择。

英文摘要：

Polynomial regression is a current method of characterizing color printers.The order number,color spaces and training samples of the polynomial regression are studied further on a color inkjet printer.Experimental results show：（1） The characterizing precision of the polynomial regression with second-order,third-order and fourth-order are respectively 10.9±0.3,6.6±0.2 and 6.0±0.2ΔE＊ab;（2）The difference of characterizing precision of the polynomial regression by using RGB to CIEXYZ or CIELAB is about one ΔE＊ab,and with increase of the training samples,this difference disappear;（3）The R,G,B of the printer should include 0 and 255 in the training samples,because both are boundary points of color gamut of a color printer,which will improve total characterizing precision of the polynomial regression model.