Acta Optica Sinica, Volume. 44, Issue 23, 2311002(2024)
Radiometric Calibration of Spatial‑Spectral Coupling Multispectral Camera
Figures & Tables(18)
Fig. 1. Schematic diagram of imaging process of spatial-spectral coupling multi-spectral camera
Fig. 3. Some device parameters. (a) Quantum efficiency of detector; (b) transmittance curves of filter and lens
Fig. 4. Basic principle diagram and experimental diagram of laboratory radiation calibration
Fig. 10. Reflectivities of standard diffuse reflectance whiteboard and diffuse reflectance greyboard
Fig. 11. Reflectivity images and relative error distributions of diffuse greyboard
Table 1. List of center wavelengths of multi-band-pass narrow-band filters
View tableTable 1. List of center wavelengths of multi-band-pass narrow-band filters
Waveband Wavelength /nm Bandwidth /nm 1 450 20 2 555 20 3 660 20 4 840 30
Table 2. Proportional initial values of radiation response coefficients
View tableTable 2. Proportional initial values of radiation response coefficients
Pixel Radiation response coefficient 450 nm 555 nm 660 nm 840 nm R 0.026 0.107 0.538 0.329 G 0.083 0.566 0.110 0.241 B 0.609 0.045 0.047 0.299 NIR 0.047 0.043 0.115 0.795
Table 3. Proportional optimal solutions of radiative response coefficients
View tableTable 3. Proportional optimal solutions of radiative response coefficients
Pixel Radiative response coefficient Element of B 450 nm 555 nm 660 nm 840 nm R 0.023 0.115 0.531 0.331 0.0009 G 0.077 0.556 0.123 0.244 0.0006 B 0.575 0.053 0.052 0.320 0.0007 NIR 0.047 0.051 0.113 0.789 0.0004
Table 4. Proportional optimal solutions of scaling coefficients
View tableTable 4. Proportional optimal solutions of scaling coefficients
Waveband /nm Proportional optimal solution A -1B R G B NIR 450 -3.48×10-3 -1.07×10-1 1.81 -6.99×10-1 9.19×10-4 555 -3.47×10-3 1.92 -2.14×10-1 -3.62×10-1 5.46×10-4 660 2.13 -3.71×10-1 2.91×10-2 -7.92×10-1 1.40×10-3 840 -2.83×10-1 -6.47×10-2 -9.82×10-2 1.44 2.16×10-4
Table 5. Reflectivity and incident irradiance of PTFE-1 standard diffuse whiteboard for each band
View tableTable 5. Reflectivity and incident irradiance of PTFE-1 standard diffuse whiteboard for each band
Waveband /
nm
Reflectivity /
%
Radiance /
（W·m-2·sr-1）
Irradiance /
（W·m-2）
450 98.61 0.317 0.321 555 98.83 0.330 0.334 660 98.94 0.302 0.305 840 98.72 0.197 0.199
Table 6. Reflectivity and average relative error of diffuse gray board for each band
View tableTable 6. Reflectivity and average relative error of diffuse gray board for each band
Waveband /nm Reflectivity /% Mean relative error /% 450 64.47 5.86 555 61.92 5.53 660 61.21 5.25 840 58.65 5.03
Table 7. Uncertainty of radiometric calibration measurement
View tableTable 7. Uncertainty of radiometric calibration measurement
Uncertainty source Absolute uncertainty /% 450 nm 555 nm 660 nm 840 nm Total uncertainty 4.79 4.69 4.60 4.53 Integral sphere 3.23 3.27 3.24 3.17 ASD 1.78 1.63 1.56 1.38 Calibrated camera 3.07 2.95 2.87 2.94
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Xuan Wu, Bin Yang, Xianfeng Li, Junqiang Zhang, Tianjiao Lu. Radiometric Calibration of Spatial‑Spectral Coupling Multispectral Camera[J]. Acta Optica Sinica, 2024, 44(23): 2311002
Paper Information
Category: Imaging Systems
Received: Jul. 10, 2024
Accepted: Sep. 25, 2024
Published Online: Dec. 16, 2024
The Author Email: Junqiang Zhang (zhangjq@ciomp.ac.cn)
CSTR:32393.14.AOS241278
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