为了实现彩色图像原稿在数字化复制过程中色彩的精确还原再现, 基于色度特征化理论, 应用多项式回归法, 提出一种以扫描仪和彩色喷墨打印机组成的彩色图像数字化复制系统为应用对象的闭环式颜色还原校正模型, 通过直接修正图像像素的三基色值, 对彩色图像在扫描和打印这两个图像复制环节实施颜色复合统一校正。同时, 采用循环逼近的校正方法, 有效提高了颜色还原校正的精度。理论分析和实验结果表明, 经过该模型的颜色还原校正后, 复制稿与原稿的最大色差从未经校正的48.51ΔE*ab降到了7.90ΔE*ab, 平均色差由15.91ΔE*ab降到了2.69ΔE*ab, 达到了颜色精确还原再现的目的。

During the process of digitized duplication, in order to reproduce and reappear the color of the color image manuscript, a closed-loop color correction method with the application object of color image duplication system, composed of a scanner and a color ink-jet printer is proposed, which is based on the colorimetric characterization theory and applies the model of polynomial regression. Compound and unitied calibration is achieve by correcting tristimulus values of image pictures when it is being scanned and printed. Accuracy of color restoration is improved effectively by circulating approximation. Theoretical analysis and experimental results show that after color correction by the method, the maximum color difference between the final copy and the original copy is reduced from 48.51ΔE*ab to 7.90ΔE*ab, and the average color difference is reduced from 15.91ΔE*ab to 2.69ΔE*ab. Thus it achieves accurate reproduction and reappearance of color.