颜色测量设备获取的光谱数据或色度数据应能够真实客观的表征物体的颜色信息。 针对不能直接与测量仪器接触的测量目标, 需要采用非接触式颜色测量方法获取其颜色信息。 根据光谱辐射度理论分析可知, 非接触式颜色测量过程中照明距离、 测量距离及曝光时间的变化对测量结果有较大影响, 而已有研究成果中并未深入研究测量参数的变化对测量结果的影响。 为了在非接触式颜色测量过程中得到准确的结果, 提出了一种基于正交试验的非接触式颜色测量参数的最优化方法。 实验通过光谱辐射度计(PhotoResearch705, Photo Research 公司, 美国)获取不同参数组合条件下标准色卡(GretagMacbeth ColorChecker Rendition Chart)的颜色信息, 结合极差分析法和方差分析法, 实验结果显示测量值与标准值的色差CIEDE2000最小为0.878 8ΔE, 最大为1.543 1ΔE, 表明该方法能有效的选取最佳参数组合, 并能分析各参数对测量结果影响的大小。

Spectral data or chrominance data acquired with color measurement device is able to objectively characterize the true color information of the object. As to the measuring target that without direct contact with the measuring instrument, it needs to adopt the non-contact color measurement method to obtain the color information.The spectral irradiance theoretical analysis shows that the changes of the color illumination distance, measuring distance and exposure time have greater impact on the measurement results. However, there is no in-depth study on the influence of the changes of measuring parameters for the measured results. In order to get the most accurate measurement results in the process of non-contact color measurement, parameter optimization study based on orthogonal experiment was proposed. Experiment with different combinations of parameters was conducted to obtain the color information of ColorChecker via PR705 spectroradiometer with range analysis and variance analysis method.Experimental results show that the minimum color difference of measured value and the standard value is 0.878 8ΔE, and the maximum color difference is 1.543 1ΔE. Data results show that the proposed method can effectively select the best combination of parameters, and to analyze the impact of various parameters on the result.