Lixuan Chen, Peng Rao, Yingying Sun, Qiang Ren, Hanlu Zhu. On-Orbit Modulation Transfer Function Measurement Method of Space Cameras Based on Star Points[J]. Laser & Optoelectronics Progress, 2020, 57(16): 161102
- Laser & Optoelectronics Progress
- Vol. 57, Issue 16, 161102 (2020)
Fig. 1. Point source imaging system
Fig. 2. Schematic of point source method
Fig. 3. Schematic of star point method reconstructionPSF process
Fig. 4. Simulation results of few pixels star point images. (a) Image1; (b) image2; (c) image3; (d) image4
Fig. 5. Simulation results of multi-pixel star point images. (a) Image1; (b) image2; (c) image3; (d) image4
Fig. 6. Scatter plots of star point images. (a) Scatter plot of single star point image; (b) encrypted scatter plot of 4 star point images registration
Fig. 7. Scatter plots of star point images registered with different number of images. (a) Single image; (b) 4 images; (c) 6 images; (d) 8 images; (e) 10 images
Fig. 8. Normalized MSE of PSF and MTF under different number of registered images. Few pixels star point images, (a) MSE after PSF normalization, (b) MSE after MTF normalization; multi-pixel star point images, (c) MSE after PSF normalization; (d) MSE after MTF normalization
Fig. 9. MTF obtained by LSF through different processing methods under different images. (a) Few pixels star point simulation images; (b) multi-pixel star point simulation images
Fig. 10. Schematic of optimized star point method
Fig. 11. MSE curves of MTF under different noise standard deviations
Fig. 12. Star point simulation diagram with different radius. (a) 0.4 pixel; (b) 0.6 pixel; (c) 0.8 pixel; (d) 0.9 pixel; (e) 1.0 pixel; (f) 2.0 pixel; (g) 3.0 pixel; (h) 4.0 pixel
Fig. 13. MSE curves of MTF under different radius
Fig. 14. Point source image sequences with different defocus. (a) -0.2 mm; (b) -0.1 mm; (c) 0 mm; (d) +0.1 mm; (e) +0.2 mm
Fig. 15. Overfocus curves of traditional point source method and proposed method
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Table 1. Processing method of each step in star point method
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Table 2. Comparison of center positioning error and running time of few pixels simulation star point images
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Table 3. Comparison of center positioning error and running time of multi-pixel simulation star point images
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Table 4. MSE of MTF obtained by different LSF processing methods under different number of images
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Table 5. MSE of MTF under different noise standard deviations
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Table 6. MSE of MTF under different radius of dispersion circles
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Table 7. Parameters of imaging system
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Table 8. Index evaluation results
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