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数字域时间延迟积分CMOS遥感相机动态传函建模分析

陶淑苹,冯钦评,陈晓龙,郑亮亮,张紫玉,高倓

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陶淑苹, 冯钦评, 陈晓龙, 郑亮亮, 张紫玉, 高倓. 数字域时间延迟积分CMOS遥感相机动态传函建模分析[J]. , 2022, 15(5): 983-991. doi: 10.37188/CO.2022-0111
引用本文: 陶淑苹, 冯钦评, 陈晓龙, 郑亮亮, 张紫玉, 高倓. 数字域时间延迟积分CMOS遥感相机动态传函建模分析[J]. , 2022, 15(5): 983-991.doi:10.37188/CO.2022-0111
TAO Shu-ping, FENG Qin-ping, CHEN Xiao-long, ZHENG Liang-liang, ZHANG Zi-yu, GAO Tan. Dynamic MTF modeling and analysis of digital domain TDI CMOS remote sensing camera[J]. Chinese Optics, 2022, 15(5): 983-991. doi: 10.37188/CO.2022-0111
Citation: TAO Shu-ping, FENG Qin-ping, CHEN Xiao-long, ZHENG Liang-liang, ZHANG Zi-yu, GAO Tan. Dynamic MTF modeling and analysis of digital domain TDI CMOS remote sensing camera[J].Chinese Optics, 2022, 15(5): 983-991.doi:10.37188/CO.2022-0111

数字域时间延迟积分CMOS遥感相机动态传函建模分析

doi:10.37188/CO.2022-0111
基金项目:国家自然科学基金项目(No. 62075219);吉林省重点科技研发计划项目(No. 20220201076GX)
详细信息
    作者简介:

    陶淑苹(1986—),女,山东潍坊人,博士,副研究员,硕士生导师,2008年于四川大学通信工程专业获得学士学位,2013年于中国科学院大学光学工程专业获得博士学位,主要从事空间遥感成像的研究。E-mail:taoshuping-163@163.com

  • 中图分类号:TP394.1;TH691.9

Dynamic MTF modeling and analysis of digital domain TDI CMOS remote sensing camera

Funds:Supported by National Natural Science Foundation of China (No. 62075219); Key Technological Research Projects of Jilin Province, China (No. 20220201076GX)
More Information
  • 摘要:

    调制传递函数(MTF)是遥感相机的重要评价指标,但是目前对于数字域 TDI CMOS 相机动态MTF特性研究十分有限,为了深入研究其像质下降机理,结合数字域TDI CMOS成像原理,建立了像元、电子快门、曝光时间、振动引起的数字域TDI成像MTF下降数学模型。结合推导模型开展了预估分析和实验验证。结果表明:传感器的有效像元区域分布会影响图像MTF,且开口率越小影响越大;CMOS传感器的卷帘快门会导致数字域TDI成像MTF下降,卷帘速度越慢影响越严重,其中卷帘速度从6 μs变为10 μs时,对应的图像MTF从0.191下降为0.177;曝光时间越短则MTF越高,尤其当存在低频像移失配时更为明显,曝光时间从180 μs减小为100 μs时,图像MTF从0.126提高为0.155,但同时也会影响图像信噪比,因此在实际应用中应合理选择曝光时间。

  • 图 1数字域TDI算法原理图

    Figure 1.Schematic diagram of TDI algorithm in digital domain

    图 2“L”形有效区域像元结构图

    Figure 2.Pixel structure of "L" shaped effective area

    图 3不同开口率下TDI CMOS的MTF曲线

    Figure 3.MTF curves of TDI CMOS at different opening rates

    图 4运动目标点在传感器投影成像为线

    Figure 4.The moving target point is imaged as a line in the projection of the sensor

    图 5不同RS速度和级数下的MTF曲线

    Figure 5.MTF curves at different RS speeds and stages

    图 6像移与正弦运动关系图

    Figure 6.Relationship between image motion and sinusoidal motion

    图 7MTF与振动频率及曝光时间的关系图

    Figure 7.Relationship between MTF, vibration frequency and exposure time

    图 8不同开口率下扇形靶标仿真图像:从左到右的开口率分别为0.8、0.5、0.3

    Figure 8.Simulation images of the sector target under different aperture ratios: 0.8, 0.5 and 0.3 (from left to right)

    图 9图8中各图像的MTF曲线

    Figure 9.MTF of images in figure 8

    图 10行读出时间分别为(a)6 μs;(b)10 μs时不同卷帘速度的TDI图像

    Figure 10.TDI images with different rolling shutter speeds. (a) 6 μs; (b) 10 μs

    图 11不同曝光时间的TDI图像:曝光时间(从上到下)分别为100、140、180 μs

    Figure 11.TDI images with different exposure times. 100, 140 and 180 μs (from top to bottom)

    表 1图像MTF和SNR测试结果

    Table 1.The MTF and SNR test results of images

    测试图像 MTF SNR/dB
    上图 0.155 17.496
    中图 0.136 23.012
    下图 0.126 26.004
    下载: 导出CSV
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出版历程
  • 收稿日期:2022-06-01
  • 修回日期:2022-07-12
  • 网络出版日期:2022-08-05

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