Image Focusing Method Based on Multiple Differential Filtering Effects for Aerial Cameras

Haijiang Wang; Lina Zheng; Qi Kang

doi:10.3788/AOS202242.0411001

Acta Optica Sinica, Volume. 42, Issue 4, 0411001(2022)

Image Focusing Method Based on Multiple Differential Filtering Effects for Aerial Cameras

Haijiang Wang^1,2, Lina Zheng^1、*, and Qi Kang^1,2

¹Key Laboratory of Airborne Optical Imaging and Measurement, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 133033, China

²University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(8)

Fig. 1. Power spectrum distribution of output signal

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Fig. 2. Multiple differential spatial filter

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Fig. 3. Process of using interlaced sampling to simulate spatial filter

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Fig. 4. Image at the calibrated focal plane position

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Fig. 5. Comparison of focal curves of different evaluation functions

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Fig. 6. Comparison of aerial images before and after focusing . (a) Before focusing; (b) after focusing

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Table 1. Measurement results of repeatability accuracy
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Table 1. Measurement results of repeatability accuracy
Angularvelocity of turntable /(rad·s^-1) Velocity ofimage motion /(mm·s^-1) RMS ofmeasurementerror /μm
0.025 5.00 6.57
0.078 15.50 10.68
0.142 28.34 14.24
0.182 36.42 23.46
0.212 42.50 29.15
0.266 53.20 41.16

Table 2. Focusing accuracies of four evaluation functions
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Table 2. Focusing accuracies of four evaluation functions
Image focusing method Focusing accuracy /μm
Proposed method 41.16
Sobel 47.32
Robert 49.52
Laplacian 52.83

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Haijiang Wang, Lina Zheng, Qi Kang. Image Focusing Method Based on Multiple Differential Filtering Effects for Aerial Cameras[J]. Acta Optica Sinica, 2022, 42(4): 0411001

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