一种基于视觉评价的白光LED显色指数改进算法

A method of modifying color rendering index for white light LED based on visual experiment

现行的CIE显色指数对白光LED的评价结果存在与视觉感知不符的问题,需要新的显色指数计算方法或对CIE显色指数进行改进。提出了一种基于视觉实验改进的计算白光LED显色指数的新方法。通过色块样本的光谱反射比与光源相对光谱功率分布之间的关系,改进了显色指数计算公式,得到改进后的显色指数。把CIE显色指数与改进后的显色指数分别与视觉评价结果进行对比,证实了改进后的显色指数更符合视觉评价结果。

The CIE color rendering index（CRI）has some problems on evaluating white light LED because of its poor correlation with the visual color rendering,therefore it is necessary to find a new calculation method or modify the existing CIE color rendering index.A new kind of method based on visual evaluation experiment is proposed in order to modify the CRI of white light LED.To obtain the modified CRI,the CRI calculation method is modified by combining the relative spectral power distribution of the light sources with the spectral reflectance of the samples.By comparing the visual evaluations with the CIE CRI and the modified CRI respectively,it is confirmed that the modified CRI correlates more with the visual evaluations.