A Method for Measuring Surface Color Based on Spectral Tunable LED Light Source and Multispectral Imaging Technology

Jinjin Chu; Guihua Cui; Yaowu Liu; Ting Xu; Xiukai Ruan; Qibo Cai; Yanhua Tan

doi:10.3788/AOS201838.0833001

Acta Optica Sinica, Volume. 38, Issue 8, 0833001(2018)

A Method for Measuring Surface Color Based on Spectral Tunable LED Light Source and Multispectral Imaging Technology

Jinjin Chu^*, Guihua Cui^*, Yaowu Liu, Ting Xu, Xiukai Ruan, Qibo Cai, and Yanhua Tan

College of Mathematics, Physics and Electronic Information Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China

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Figures & Tables(13)

Fig. 1. Basis functions for spectral reflectance

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Fig. 2. Camera spectral sensitivity obtained by monochromator measurement and digital imaging measurement

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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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Fig. 4. Spectral power distribution of 11 LEDs

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Fig. 5. Multispectral imaging system

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Fig. 6. Spectral power distribution of 16 LEDs

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Fig. 7. Nine ideal light sources (solid lines) and fitted light sources (broken lines)

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Fig. 8. Comparison of the first 12 spectral reflectance between reconstructed result and ground truth

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Fig. 9. Comparison of the last 12 spectral reflectance between reconstructed result and ground truth

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Table 1. Average RMSE and ΔEab* under different numbers of basis functions
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Table 1. Average RMSE and ΔEab* under different numbers of basis functions
Number of b(λ) RMSE Δ $\begin{matrix} E_{ab}^{*} \end{matrix}$
4 0.051 4.2
5 0.050 3.7
6 0.049 3.7

Table 2. RMSE and ΔEab* under different light intensities of illumination
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Table 2. RMSE and ΔEab* under different light intensities of illumination
Illuminance /lx RMSE Δ $\begin{matrix} E_{ab}^{*} \end{matrix}$
43 0.033 3.1
55 0.037 4.8
132 0.061 9.3
Mixed 0.031 2.3

Table 3. RMSE and ΔEab* of the first 12 color patches

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Table 3. RMSE and ΔEab* of the first 12 color patches

No.	Color patch	RMSE	Δ $\begin{matrix} E_{ab}^{*} \end{matrix}$
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

Table 4. RMSE and ΔEab* of the last 12 color patches

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Table 4. RMSE and ΔEab* of the last 12 color patches

No.	Color patch	RMSE	Δ $\begin{matrix} E_{ab}^{*} \end{matrix}$
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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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

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