Colorimetric Characterization of Digital Reflection Microscope Based on Non-RAW Data

Xu Peng; Zhang Keqi; Zhang Haijun; Mao Lei; Qiu Yuanfang; Zeng Zhi

doi:10.3788/LOP202158.0133001

Laser & Optoelectronics Progress, Volume. 58, Issue 1, 133001(2021)

Colorimetric Characterization of Digital Reflection Microscope Based on Non-RAW Data

Xu Peng^1,2,3、*, Zhang Keqi¹, Zhang Haijun², Mao Lei¹, Qiu Yuanfang¹, and Zeng Zhi¹

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

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Figures & Tables(8)

Fig. 1. Flowchart of color correction based on non-RAW data

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Fig. 2. Nonlinearity correction curves of RGB channels. (a) R channel; (b) G channel; (c) B channel

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Fig. 3. Color correction results of Classic card and sample. (a) True color of Classic card; (b) appearance color of sample; (c) JEPG image color of Classic card; (d)-(g) color correction results of Classic card under different methods, which are nonlinearity uncorrected + linear colorimetric characterization model, nonlinearity corrected + linear colorimetric characterization model, nonlinearity uncorrected + polynomial colorimetric characterization model, and nonlinearity corrected + polynomial colori

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Fig. 4. Nonlinearity correction curves of RGB channels under three luminance levels. (a) R channel; (b) G channel; (c) B channel

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Fig. 5. Chromaticity of light source under different luminance levels

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Table 1. Accuracy of colorimetric characterization before and after nonlinearity correction
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Table 1. Accuracy of colorimetric characterization before and after nonlinearity correction
ΔE₀₀ Linear model Polynomial model
Before After Before After
Mean 9.96 4.27 2.80 2.58
Max 23.08 8.48 9.25 7.74
Std. 5.77 1.76 2.01 1.97

Table 2. Accuracy of colorimetric characterization before and after nonlinearity correction under three luminance levels
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Table 2. Accuracy of colorimetric characterization before and after nonlinearity correction under three luminance levels
Luminance level Linear model Polynomial model
Before After Before After
L1 9.96 4.27 2.80 2.58
L2 9.27 3.26 2.72 2.62
L3 8.89 2.72 2.43 2.33

Table 3. Accuracy of colorimetric characterization before and after correction with general nonlinearity correction model under three luminance levels
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Table 3. Accuracy of colorimetric characterization before and after correction with general nonlinearity correction model under three luminance levels
Luminance level Linear model Polynomial model
Before After Before After
L1 9.96 5.14 2.80 2.64
L2 9.27 3.29 2.72 2.67
L3 8.89 3.09 2.43 2.35

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Xu Peng, Zhang Keqi, Zhang Haijun, Mao Lei, Qiu Yuanfang, Zeng Zhi. Colorimetric Characterization of Digital Reflection Microscope Based on Non-RAW Data[J]. Laser & Optoelectronics Progress, 2021, 58(1): 133001

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Paper Information

Category: Vision, Color, and Visual Optics

Received: Apr. 14, 2020

Accepted: --

Published Online: Jan. 28, 2021

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

DOI:10.3788/LOP202158.0133001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Accuracy of colorimetric characterization before and after nonlinearity correction

Table 1. Accuracy of colorimetric characterization before and after nonlinearity correction

Table 2. Accuracy of colorimetric characterization before and after nonlinearity correction under three luminance levels

Table 2. Accuracy of colorimetric characterization before and after nonlinearity correction under three luminance levels

Table 3. Accuracy of colorimetric characterization before and after correction with general nonlinearity correction model under three luminance levels

Table 3. Accuracy of colorimetric characterization before and after correction with general nonlinearity correction model under three luminance levels