Quantitative Image Quality Improvement Method Based on On-Orbit MTF Test

Table 1. Target test information
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Table 1. Target test information
测试序号太阳高度角/（°）卫星侧摆角/（°）偏航/（°）
1 55.60 1.01 2.80
2 68.75 −6.58 2.79
3 69.03 5.12 2.78
4 68.59 10.23 2.73
5 57.61 2.34 2.80

Table 2. Frequency response value
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Table 2. Frequency response value
归一化空间频率（Nyquist频率）垂轨MTF 沿轨MTF 频域响应幅值
0 1 1 1
0.25 0.7368 0.6534 1.1276
0.3536 0.6193 0.5127 1.2079
0.5 0.5024 0.3271 1.5359
0.7071 0.3294 0.1563 2.1075
1 0.1459 0.0421 3.4656

Table 3. SNR on orbit test
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Table 3. SNR on orbit test
反射率 DN SNR
反射率1 509.47 35.32
反射率2 1267.64 40.95
反射率3 1973.82 43.7
反射率4 2647.61 45.17
反射率5 3136.34 46.12

Table 4. Comparison before and after restoration

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Table 4. Comparison before and after restoration

	指标名称	复原前	复原后	对比结果
客观指标	亮度/DN	747.80	747.29	−0.07%
	标准差/DN	130.17	130.36	0.15%
	对比度	16.13	17.43	8.06%
	清晰度	0.36	0.39	8.33%
	方差/DN	1452.57	1 455.37	0.19%
	角二阶矩	0.05	0.05	0.00%
	图像信噪比/dB	34.36	33.88	−0.48
	垂轨方向MTF@奈频	0.1459	0.1460	0.07%
	沿轨方向MTF@奈频	0.0421	0.1477	250.83%
	NIIRS	4.57	4.69	2.63%
主观指标	噪声	轻微下降
主观指标	清晰度	明显提升

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Yuhe ZHOU, Ruimin FU, Wenwen QI. Quantitative Image Quality Improvement Method Based on On-Orbit MTF Test[J]. Spacecraft Recovery & Remote Sensing, 2024, 45(2): 125

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