目的 构建基于数字成像设备的光谱测量系统， 获得“快速、精确、低成本”的光谱反射比测量结果。 方法 通过数码相机获取印刷用色表ECI2002的 1485 个色块的 3 通道RGB 值，根据与待测样本的相似程度对训练样本赋予不同的权重， 并引入空间向量余弦度， 对可以表征颜色信息的光谱反射比进行重建；同时， 针对该测色系统进行镜头畸变校正、光源均匀性校正以及重复性校正。 结果 在训练样本数为 10时， 平均色差可以控制在 0.62以下， 均方根误差可以控制在 0.01 以下， 运算时间可以控制在1 min内 。 结论 构建的数字成像测量系统既可以提高测量精度， 又可以提高测量效率， 具有工程应用价值。

Objective To construct a spectral measurement system based on digital imaging equipment, and to achieve "fast, accurate, low-cost" spectral measurement results. Methods Three-channel RGB values were obtained from each color with the color table ECI2002 by a digital camera. Different weights were assigned according to the similarity of samples and the cosine similarity were introduced, to reconstruct the spectral reflectance which could represent the original color information. Meanwhile, lens distortion correction, light uniformity correction and system repetitiveness correction were proposed for the color measurement system. Results The proposed method brought the average color difference to below 0.62, RMS to below 0.01 and controlled the computation time within 1 min when the number of training sample was 10.Conclusion The digital imaging measurement system constructed in this paper could enhance the measurement accuracy and improve the efficiency, save the time, and therefore has engineering application potential.