Optimization of Colorimetric Characterization Target for Color Digital Cameras Based on Uniform Color Samples

Peng Xu; Haijun Zhang; Keqi Zhang; Lei Mao; Yuanfang Qiu; Jufeng Zhao

doi:10.3788/AOS202141.1133001

Acta Optica Sinica, Volume. 41, Issue 11, 1133001(2021)

Optimization of Colorimetric Characterization Target for Color Digital Cameras Based on Uniform Color Samples

Peng Xu^1,2,3、*, Haijun Zhang², Keqi Zhang¹, Lei Mao¹, Yuanfang Qiu¹, and Jufeng Zhao⁴

Author Affiliations

¹Ningbo Yongxin Optics Co., Ltd., Ningbo, Zhejiang 315040, China

²College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China

³Jiyang College of Zhejiang A&F University, Zhuji, Zhejiang 311800, China;

⁴School of Electronics and Information Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China

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Figures & Tables(10)

Fig. 1. Flowchart of optimizing target samples. (a) Selection of uniform color samples; (b) optimization of target samples

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Fig. 2. Uniform color samples

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Fig. 3. General spectral sensitivities of digital color cameras

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Fig. 4. Optimized target samples with RAW data. (a) Optimized target samples based on linear characterization model; (b)--(f) optimized target samples based on polynomial colorimetric characterization model with different terms, and the number of terms is 5, 6, 8, 9, and 11, respectively

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Fig. 5. Optimized target samples based on sRGB values and polynomial colorimetric characterization models. (a)--(e) Optimized target samples based on polynomial colorimetric characterization model with different terms, and the number of terms is 5, 6, 8, 9, and 11, respectively

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Fig. 6. Color difference maps of the recovered colorimetric images with two targets respectively. (a) Original image represented by sRGB image; (b) color difference map of the recovered colorimetric image with DC target; (c) color difference map of the recovered colorimetric image with P11 target

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Table 1. Number of optimized target samples with RAW data
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Table 1. Number of optimized target samples with RAW data
Parameter L P5 P6 P8 P9 P11
Color samples 72 30 168 504 336 168
Hue 6 6 6 9 6 6
Samples in each hue 12 5 28 56 56 28
Neutral samples 6 6 6 9 6 6
Total 78 36 174 513 342 174

Table 2. Accuracy of colorimetric characterization for different target samples with RAW data

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Table 2. Accuracy of colorimetric characterization for different target samples with RAW data

ΔE₀₀	Linear model				Polynomial model
ΔE₀₀	DSG	DC	CL	L	DSG	DC	CL	P5	P6	P8	P9	P11
Mean	1.02	1.03	1.00	0.97	0.91	1.01	0.93	1.14	1.00	1.13	0.89	0.99
Max.	2.71	2.54	2.69	2.42	2.04	2.00	1.83	2.60	2.32	2.30	1.89	2.00
Std.	0.55	0.57	0.58	0.48	0.47	0.52	0.47	0.47	0.36	0.34	0.38	0.40

Table 3. Number of optimized target samples with sRGB data
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Table 3. Number of optimized target samples with sRGB data
Parameter P5 P6 P8 P9 P11
Color samples 126 72 168 1008 504
Hue 18 18 12 18 9
Samples in each hue 7 4 14 56 56
Neutral samples 18 18 12 18 9
Total 144 90 180 1026 513

Table 4. Accuracy of colorimetric characterization for different target samples based on sRGB data
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Table 4. Accuracy of colorimetric characterization for different target samples based on sRGB data
ΔE₀₀ Polynomial model
DSG DC CL P5 P6 P8 P9 P11
Mean 1.77 1.64 1.88 8.98 7.95 8.19 2.05 1.64
Max. 5.49 4.06 6.30 13.49 11.28 13.03 4.44 3.82
Std. 1.37 1.02 1.45 2.29 1.77 2.05 0.99 0.88

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Peng Xu, Haijun Zhang, Keqi Zhang, Lei Mao, Yuanfang Qiu, Jufeng Zhao. Optimization of Colorimetric Characterization Target for Color Digital Cameras Based on Uniform Color Samples[J]. Acta Optica Sinica, 2021, 41(11): 1133001

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Paper Information

Category: Vision, Color, and Visual Optics

Received: Nov. 16, 2020

Accepted: Jan. 8, 2021

Published Online: Jun. 7, 2021

The Author Email: Xu Peng (xsjzxp@163.com)

DOI:10.3788/AOS202141.1133001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Number of optimized target samples with RAW data

Table 1. Number of optimized target samples with RAW data

Table 2. Accuracy of colorimetric characterization for different target samples with RAW data

Table 2. Accuracy of colorimetric characterization for different target samples with RAW data

Table 3. Number of optimized target samples with sRGB data

Table 3. Number of optimized target samples with sRGB data

Table 4. Accuracy of colorimetric characterization for different target samples based on sRGB data

Table 4. Accuracy of colorimetric characterization for different target samples based on sRGB data