基于LED照明的色差评价研究

Study on Evaluation of Color Difference Based on LED Lighting

截止目前,多国相关颜色科学工作者已累计提出了40多个色差公式,但是目前所有的色差公式的相关使用,都只能限定在CIE给定的观测条件。固态照明作为近些年光源研究的重点方向,相关的研究如基于LED照明条件的色差研究仍未展开。该研究遵循CIE的色差研究指导原则,首先选取CIE推荐的17种颜色中心中的五种颜色,制成实验色块样张,分别以U30,TL84和D65光源为参考光源,以LED灯泡为实验光源。选用CIE1976LUV色差公式、CIE1976LAB色差公式、CIEDE2000色差公式分别对打印色块进行理论色差值的计算。然后采用20名观察者,通过心理物理学的视觉评价实验对打印色样进行主观色差评价,最后通过标准化残差平方和(STRESS)将客观计算值与主观评价数据进行对比分析。发现实验中选用的三种色差公式在LED照明条件下的色差预测性能均不是很理想。相比而言,在LED照明条件下,CIE1976LUV公式的预测性能相对要好,CIEDE2000公式次之,CIE1976LAB公式最差。

Until now,multinational related color scientists have accumulated more than 40 color formula,but the current use of all the color difference formula can only be limited to the given observation conditions in the CIE.Solid-state lighting as the focus of recent years,the focus of research,related research,such as related research based on LED lighting conditions has not started yet.So in this experiment,following the CIE color of the guiding principle of the study,we first selected CIE recommended 17 color centers in the five colors,which were made of experimental color proofs,followed by U30,TL84,D65 standard light source was set as the reference light source,To LED light bulb as experimental light source.The CIE1976LUV color difference formula,CIE1976LAB color difference formula and CIEDE2000 color difference formula were used to calculate the color difference of the printed patches respectively.Then,20 visual observers were used to evaluate the subjective color difference of the printed patches by the visual evaluation experiment based on psychophysics.Finally,the objective calculation residual value(STRESS)is used to compare the objective calculation value with the subjective evaluation data.Found in this test selected three color formula in the LED lighting conditions,the color prediction performance is not very satisfactory.Overall,in the LED lighting conditions,CIE1976LUV formula predictive performance is relatively better,followed by CIEDE2000 formula,CIE1976LAB formula the third.