提出了一种用于光源类型检测的同色异谱对的构建方法,实现了对光源类型的快速有效判定。在目标光源下,利用R矩阵理论从Standard Object Colour Spectra Database中分解出同色异谱黑光谱集;将同色异谱黑与任意目标样本光谱相加,获得目标样本的同色异谱样本集;去除样本集中光谱存在负值的样本;以一般同色异谱指数作为评价指标,选择目标样本同色异谱指数最大的样本,完成同色异谱对的构建。选取4种常见光源,以ColorChecker色卡为目标样本,利用上述方法构建同色异谱对。通过计算同色异谱对在不同光源下的色差值,对其在光源类型判定方面的有效性进行验证。实验结果表明:该方法构建的同色异谱对在非目标光源下具有人眼可辨别的显著色差水平,能够有效地对目标光源的类型进行判定。

A method is proposed to construct metameric pairs for illuminant detection. The proposed method allows the quick and effective determination of the illuminant type. According to this method, a metameric black spectrum set is initially decomposed from the Standard Object Colour Spectra Database under the target illuminant based on the matrix R theory. Subsequently, a metameric sample set of the target sample is obtained by adding a metameric black to any target sample. After eliminating the samples that exhibit negative spectra, the sample with the largest metamerism index is selected to construct a metameric pair, with the general metamerism index as an evaluation index. Further, the proposed method is used to construct metameric pairs under four standard illuminants. The validity of the proposed method can be verified by calculating the color-difference value of the metameric pairs under different illuminants. The experimental results demonstrate that the metameric pairs exhibit a significant color-difference level under non-target illuminants and they can effectively determine the target illuminant type.