Two-Dimensional Pointing Mirror Rotation Correction and Stitching Method

Fig. 3. Rotation angle of pointing mirror and size of detector array. (a) Schematic diagram of nine-grid image rotation angles; (b) coordinate of detector image size

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Fig. 4. Nine-grid terrain field-of-view model

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Fig. 5. Outdoor experimental scene

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Fig. 6. Results before and after image rotation correction for two adjacent images with angles $(- α, 0)$ and $(α, - β)$ . (a) Subimage 8 of raw images acquired by detector; (b) subimage 9 of raw images acquired by detector; (c) subimage 8 after image rotation correction; (d) subimage 9 after image rotation correction

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Fig. 7. Result display of different image stitching algorithms. (a) SIFT algorithm; (b) BRISK algorithm; (c) ORB algorithm; (d) SURF algorithm; (e) proposed algorithm

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Fig. 8. Stitched result of nine-grid large field-of-view

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Table 1. Main parameter settings for satellite detectors

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Table 1. Main parameter settings for satellite detectors

Parameter	Value
Detector specification $H \times W$	1024×1024
Orbit height $d$ /km	526.6
Focal length $f$ /mm	158
Sensor pixel dimensions $S_{h} \times S_{w}$ /（μm×μm）	15×15
Pitch axis $β$ /（°）	$-$ 3-3
Azimuth axis $α$ /（°）	$-$ 6-6

Table 2. $Δ ϕ$ before and after image rotation elimination
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Table 2. $Δ ϕ$ before and after image rotation elimination
Serial number $\bar{Δ ϕ_{O}}$ /（°） $\bar{Δ ϕ_{r}}$ /（°） Correction ratio /%
1 0.46 0 100
2 0.53 0 100
3 0.65 0 100
4 0.66 0 100
5 0.46 0 100

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Dandan Li, Chao Ma, Mengyang Chai, Dexin Sun. Two-Dimensional Pointing Mirror Rotation Correction and Stitching Method[J]. Acta Optica Sinica, 2024, 44(12): 1211001

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