一种基于光谱可调LED光源和多光谱成像技术的物体表面颜色测量方法 下载: 1559次
A Method for Measuring Surface Color Based on Spectral Tunable LED Light Source and Multispectral Imaging Technology
温州大学数理与电子信息工程学院, 浙江 温州 325035
图 & 表
图 1. 光谱反射率基函数
Fig. 1. Basis functions for spectral reflectance
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图 2. 单色仪测量方法和数字图像测量方法得到的相机光谱灵敏度
Fig. 2. Camera spectral sensitivity obtained by monochromator measurement and digital imaging measurement
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图 3. 基函数除以相机灵敏度得到的光谱功率分布。(a) bi(λ)/s(λ);(b) bi(λ)/s(λ)
Fig. 3. Spectral power distribution constructed by dividing basis function by camera sensitivity function. (a) bi(λ)/s(λ); (b) bi(λ)/s(λ)
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图 4. 11颗LED的光谱功率分布
Fig. 4. Spectral power distribution of 11 LEDs
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图 5. 多光谱成像系统
Fig. 5. Multispectral imaging system
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图 6. 16颗LED的光谱功率分布
Fig. 6. Spectral power distribution of 16 LEDs
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图 7. 9个理想光源(实线)和拟合光源(虚线)比较
Fig. 7. Nine ideal light sources (solid lines) and fitted light sources (broken lines)
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图 8. 重建出的前12个光谱反射率与分光光度计测量的光谱反射率的对比
Fig. 8. Comparison of the first 12 spectral reflectance between reconstructed result and ground truth
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图 9. 重建出的后12个光谱反射率与分光光度计测量的光谱反射率的对比
Fig. 9. Comparison of the last 12 spectral reflectance between reconstructed result and ground truth
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表 1不同数量基函数时的平均RMSE和ΔEab*
Table1. Average RMSE and ΔEab* under different numbers of basis functions
Number of b(λ) | RMSE | Δ |
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4 | 0.051 | 4.2 | 5 | 0.050 | 3.7 | 6 | 0.049 | 3.7 |
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表 2在不同光源照度下的RMSE和ΔEab*
Table2. RMSE and ΔEab* under different light intensities of illumination
Illuminance /lx | RMSE | Δ |
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43 | 0.033 | 3.1 | 55 | 0.037 | 4.8 | 132 | 0.061 | 9.3 | Mixed | 0.031 | 2.3 |
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表 3前12个色块的RMSE和ΔEab*
Table3. RMSE and ΔEab* of the first 12 color patches
No. | Color patch | RMSE | Δ |
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1 | Dark skin | 0.022 | 4.5 | 2 | Light skin | 0.030 | 1.1 | 3 | Blue sky | 0.035 | 2.0 | 4 | Foliage | 0.014 | 2.5 | 5 | Blue flower | 0.018 | 2.9 | 6 | Bluish green | 0.038 | 0.2 | 7 | Orange | 0.046 | 2.6 | 8 | Purplish blue | 0.032 | 0.9 | 9 | Moderate red | 0.034 | 3.2 | 10 | Purple | 0.046 | 4.4 | 11 | Yellow green | 0.021 | 3.6 | 12 | Orange yellow | 0.047 | 2.9 | Average | | 0.032 | 2.5 |
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表 4后12个色块的RMSE和ΔEab*
Table4. RMSE and ΔEab* of the last 12 color patches
No. | Color patch | RMSE | Δ |
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13 | Blue | 0.025 | 1.7 | 14 | Green | 0.022 | 1.8 | 15 | Red | 0.055 | 4.7 | 16 | Yellow | 0.036 | 2.1 | 17 | Magenta | 0.045 | 1.5 | 18 | Cyan | 0.035 | 1.4 | 19 | White | 0.045 | 2.1 | 20 | Neutral 8 | 0.024 | 1.7 | 21 | Neutral 6.5 | 0.026 | 1.9 | 22 | Neutral 5 | 0.033 | 3.9 | 23 | Neutral 3.5 | 0.017 | 2.6 | 24 | Black | 0.004 | 1.8 | Average | | 0.031 | 2.3 |
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褚金金, 崔桂华, 柳耀武, 徐婷, 阮秀凯, 蔡启博, 谈燕花. 一种基于光谱可调LED光源和多光谱成像技术的物体表面颜色测量方法[J]. 光学学报, 2018, 38(8): 0833001. Jinjin Chu, Guihua Cui, Yaowu Liu, Ting Xu, Xiukai Ruan, Qibo Cai, Yanhua Tan. A Method for Measuring Surface Color Based on Spectral Tunable LED Light Source and Multispectral Imaging Technology[J]. Acta Optica Sinica, 2018, 38(8): 0833001.