Chinese Journal of Lasers, Volume. 46, Issue 7, 0704010(2019)
Improved Method for On-Orbit Modulation Transfer Function Detection of Space Cameras
Figures & Tables(19)
Fig. 4. Generated round-edge simulation images. (a) High-resolution simulation image; (b) low-resolution simulation image; (c) theoretical MTF curve of simulation image
Fig. 8. Acquisition images of two test targets. (a) Three-bar target; (b) three-bar target (local amplification); (c) round-edge target 1; (d) round-edge target 2; (e) round-edge target 3
Fig. 10. Results of lunar-edge method from laboratory images. (a) Images of three round-edge targets with different radii; (b) positions of subpixel-edge detection; (c) ESF curves; (d) LSF curves; (e) MTF curves
Table 1. Theoretical MTF values at various spatial frequencies
View tableTable 1. Theoretical MTF values at various spatial frequencies
Spatial frequency MTF Spatial frequency MTF Spatial frequency MTF 0 1.000000 14 0.800863 28 0.409192 1 0.998751 15 0.774989 29 0.383224 2 0.995458 16 0.748124 30 0.358026 3 0.989765 17 0.720620 31 0.333701 4 0.982020 18 0.692468 32 0.310255 5 0.972031 19 0.663928 33 0.287773 6 0.960040 20 0.635065 34 0.266251 7 0.946013 21 0.606066 35 0.245743 8 0.930090 22 0.577041 36 0.226245 9 0.912383 23 0.548127 37 0.207774 10 0.892939 24 0.519447 38 0.190336 11 0.871990 25 0.491109 39 0.173907 12 0.849512 26 0.463225 40 0.158507 13 0.825830 27 0.435892 41 0.144072
Table 2. Theoretical edge position of each line in simulation image
View tableTable 2. Theoretical edge position of each line in simulation image
Row No. Edge position Row No. Edge position Row No. Edge position 1 33.7188 11 35.4844 21 36.5000 2 33.9375 12 35.6094 22 36.5156 3 34.1406 13 35.7500 23 36.6250 4 34.3281 14 35.8750 24 36.6250 5 34.5313 15 35.9844 25 36.6406 6 34.7031 16 36.0781 26 36.7500 7 34.8750 17 36.1719 27 36.7500 8 35.0469 18 36.2500 28 36.7500 9 35.1875 19 36.3594 29 36.7500 10 35.3438 20 36.4063 30 36.7500
Table 3. Edge detection error of three methods
View tableTable 3. Edge detection error of three methods
SNR /dB Edge detection error /pixel Interpolation method Gray moment method Fitting method 50 0.2205 0.0156 0.0133 40 0.2570 0.0222 0.0215 30 0.5167 0.0871 0.0422
Table 4. Edge fitting errorof arcs with different lengths
View tableTable 4. Edge fitting errorof arcs with different lengths
SNR /dB Arc degree /(°) Fitting error /pixel Straight line fitting Polynomial fitting Circle fitting 4(6 rows) 0.0052 0.0068 0.0084 8(12 rows) 0.0575 0.0254 0.0255 12(18 rows) 0.0970 0.0290 0.0288 50 16(24 rows) 0.1653 0.0259 0.0257 20(30 rows) 0.2523 0.0235 0.0234 40(60 rows) 1.0042 0.0171 0.0169 60(90 rows) 2.2933 0.0220 0.0144 4(6 rows) 0.0098 0.0100 0.1247 8(12 rows) 0.0581 0.0273 0.0267 12(18 rows) 0.0976 0.0308 0.0306 40 16(24 rows) 0.1653 0.0269 0.0262 20(30 rows) 0.2524 0.0239 0.0238 40(60 rows) 1.0042 0.0181 0.0181 60(90 rows) 2.2933 0.0235 0.0166 4(6 rows) 0.0788 0.0803 0.2666 8(12 rows) 0.0936 0.0784 0.0796 12(18 rows) 0.1024 0.0467 0.0722 30 16(24 rows) 0.1666 0.0347 0.0381 20(30 rows) 0.2532 0.0351 0.0442 40(60 rows) 1.0050 0.0432 0.0424 60(90 rows) 2.2936 0.0499 0.0461
Table 5. Accuracy results of different methods
View tableTable 5. Accuracy results of different methods
SNR /dB Fermi MSG+single Gaussian fitting MSG+double Gaussian fitting 50.0 0.0106 0.0273 0.0084 47.5 0.0107 0.0290 0.0090 45.0 0.0108 0.0308 0.0095 42.5 0.0112 0.0373 0.0103 40.0 0.0112 0.0393 0.0107 37.5 0.0131 0.0404 0.0129 35.0 0.0133 0.0573 0.0136 32.5 0.0144 0.0665 0.0140 30.0 0.0139 0.1049 0.0142
Table 6. Parameters of experimental devices
View tableTable 6. Parameters of experimental devices
Experimental device Parameter Light source Center wavelength:650 nm Parallel light pipe Focallength:1000 mm Lens Relative aperture:1∶12 CCD detector Cell size:0.012 mm
Table 7. MTF values of three-bar target test
View tableTable 7. MTF values of three-bar target test
Defocus position /mm MTF Defocus position /mm MTF Defocus position /mm MTF -0.75 0.00920 -0.25 0.16764 0.25 0.19157 -0.70 0.01141 -0.20 0.18051 0.30 0.14862 -0.65 0.02217 -0.15 0.19376 0.35 0.13900 -0.60 0.03439 -0.10 0.22116 0.40 0.11761 -0.55 0.04168 -0.05 0.2333 0.45 0.09270 -0.50 0.05688 0.00 0.22568 0.50 0.05384 -0.45 0.08602 0.05 0.22186 0.55 0.04535 -0.40 0.10215 0.10 0.21710 0.60 0.01680 -0.35 0.12632 0.15 0.21792 0.65 0.00032 -0.30 0.13891 0.20 0.19957 0.70 0.00012
Table 8. MTF values of round-edge target test
View tableTable 8. MTF values of round-edge target test
Defocus position /mm Round-edge target 1 Round-edge target 2 Round-edge target 3 -0.75 0.00109 0.05828 0.06555 -0.70 0.03612 0.06823 0.07635 -0.65 0.06608 0.08410 0.08156 -0.60 0.03407 0.08210 0.09555 -0.55 0.07076 0.08805 0.09635 -0.50 0.08372 0.11530 0.13225 -0.45 0.08201 0.14231 0.12667 -0.40 0.10369 0.15450 0.15703 -0.35 0.11279 0.15477 0.16997 -0.30 0.14080 0.17789 0.19099 -0.25 0.16225 0.17268 0.19216 -0.20 0.18424 0.18441 0.21711 -0.15 0.19507 0.20169 0.22634 -0.10 0.19621 0.20218 0.23121 -0.05 0.21491 0.19751 0.21939 0.00 0.22924 0.20478 0.23830 0.05 0.22083 0.20034 0.21507 0.10 0.22078 0.21254 0.20748 0.15 0.21589 0.18054 0.19756 0.20 0.20750 0.18907 0.18829 0.25 0.18407 0.17510 0.17659 0.30 0.14150 0.14235 0.15959 0.35 0.13955 0.12649 0.10052 0.40 0.10618 0.10087 0.08592 0.45 0.09021 0.06674 0.08080 0.50 0.07664 0.06061 0.06878 0.55 0.06089 0.02211 0.00700 0.60 0.05772 0.00595 0.03814 0.65 0.00038 0.00249 0.03138 0.70 0.00081 0.00034 0.03958
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Ying Cheng, Hongwei Yi, Xinlong Liu. Improved Method for On-Orbit Modulation Transfer Function Detection of Space Cameras[J]. Chinese Journal of Lasers, 2019, 46(7): 0704010
Paper Information
Category: measurement and metrology
Received: Nov. 16, 2018
Accepted: Feb. 25, 2019
Published Online: Jul. 11, 2019
The Author Email: Cheng Ying (chengying2015@opt.cn), Yi Hongwei (chengying2015@opt.cn)
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