An efficient procedure for recovering spectral reflectance using an object’s tristimulus values under multi-illuminants is proposed by adapting with the characteristics of the testing sample to obtain the transformation matrix of pseudoinverse. Specifically, we propose the reference illuminants selection strategy and local sample weighted strategy to obtain the optimal transformation matrix under multi-illuminants condition. Selecting the reference illuminants are based on the result of the spectral angle mapper (SAM) statistics. The number of the selected local training samples and the weighted local samples can be determined by using the multicolor space Euclidean distance. To compare the experimental results, the proposed method significantly increases the spectral and colorimetric accuracy for the spectral reflectance recovery process.

中文翻译：

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在多光源下从三刺激值恢复光谱反射率

通过适应测试样品的特性，获得伪逆矩阵，提出了一种在多光源下利用物体的三刺激值恢复光谱反射率的有效方法。具体来说，我们提出了参考光源选择策略和局部样本加权策略，以获得多光源条件下的最优变换矩阵。选择参考光源是基于光谱角度映射器（SAM）统计数据的结果。所选局部训练样本和加权局部样本的数量可以通过使用多色空间欧式距离来确定。为了比较实验结果，该方法显着提高了光谱反射率恢复过程的光谱和比色准确度。