Journal of Infrared and Millimeter Waves, Volume. 42, Issue 6, 851(2023)

A self-calibration method of the boresight angles of airborne hyperspectral VNIR/SWIR modules

Ran GUO1,2 and Yue-Ming WANG1,2、*
Author Affiliations
  • 1Key Laboratory of Space Active Opto-Electronics Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China
  • 2University of Chinese Academy of Sciences,Beijing 100049,China
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    Figures & Tables(23)
    The algorithm flowchart of boresight angle calibration
    The schematic diagram of the AMMIS optical system for a single VNIR subsystem
    The schematic diagram of the AMMIS optical system for a single SWIR subsystem
    The imaging modes of six VNIR/SWIR subsystems
    The definition of camera coordinate system and the illustration of projection process
    The effect of boresight angles on forward intersection (blue is before applying disturbance to boresight angles,red is after applying disturbance to boresight angles)
    The schematic diagram of flight direction and imaging subsystem identification
    The distribution of feature points in VNIR images captured by camera group 1 and their local enlargements,Note:red dots are the locations of feature points
    The distribution of feature points in SWIR images captured by camera group 1 and their local enlargements,Note:blue dots are the locations of feature points
    The schematic diagram of Dist in the rasterized image with ΔX,ΔY in UTM coordinate system
    The influence of various feature selection methods on the results of feature point selection (a case study using the first group of camera)
    Checkerboard images projected in UTM coordinate system for VNIR and SWIR data using various methods
    The comparative analysis of reprojection error and projection plane altitude error using random search and approximate formulas (a case study using the second group of camera)
    The peprojection error of VNIR and SWIR images from three sets of cameras with original parameters
    The reprojection error of VNIR and SWIR images from three sets of cameras with our method
    The reprojection error of VNIR and SWIR images from three sets of cameras calibrated with homography constraints and our method
    The reprojection error of VNIR and SWIR images from three sets of cameras with homography constraints
    • Table 1. Core parameters of the AMMIS VNIR/SWIR hyperspectral imaging subsystem

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      Table 1. Core parameters of the AMMIS VNIR/SWIR hyperspectral imaging subsystem

      参数VNIRSWIR
      波长范围/nm400~1 0001 000~2 500
      视场角/°1414
      瞬时视场角/mrad0.250.5
      焦距/mm12850
      波段数256512
      单机像元数1024512
      像元尺寸/μm3225
      数据位数/bit1616
      相邻单机之间夹角/°12.7812.78
    • Table 2. Number of features extracted from VNIR and SWIR images

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      Table 2. Number of features extracted from VNIR and SWIR images

      相机分组123
      FLANN1 8552 7744 124
      FLANN +RANSAC1 5102 5742 926
      FLANN +RANSAC+DBSCAN1 1812 4062 784
    • Table 3. The calibration result of the boresight angles and focal length scale

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      Table 3. The calibration result of the boresight angles and focal length scale

      相机分组123
      横滚角 (rad)-0.013 5-0.013 92-0.014 2
      俯仰角(rad)0.000 06-0.000 48-0.000 66
      偏航角(rad)-0.000 360.003 640.000 86
      焦距比例1.004 61.000 81.003 6
    • Table 4. The comparison of reprojection error in UTM coordinate system before and after calibration

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      Table 4. The comparison of reprojection error in UTM coordinate system before and after calibration

      相机分组校正前校正后
      X坐标残差Y 坐标残差sX 坐标残差Y 坐标残差
      Mean(m)STD(m)Mean(m)STD(m)Mean(m)STD(m)Mean(m)STD(m)
      1-3.60.9132.51.750.0090.480.0060.56
      2-2.81.2129.60.53-0.010.46-0.0530.49
      3-2.21.1230.10.620.0150.47-0.090.52
    • Table 5. Quadratic curve fitting results for the relationship between Y-direction reprojection error and Dist

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      Table 5. Quadratic curve fitting results for the relationship between Y-direction reprojection error and Dist

      单应性约束本文方法
      相机分组123123
      A-0.06-0.0430.0130.01-0.028-0.12
      B0.410.23-0.08-0.10.150.65
      C-0.51-0.240.140.25-0.16-0.75
    • Table 6. Euler angles derived from the decomposition of the homography matrix

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      Table 6. Euler angles derived from the decomposition of the homography matrix

      相机分组X (°)Y (°)Z (°)
      11.2e-047.6e-042.42
      2-1.2e-057.7e-049.8e-01
      33.5e-061.8e-052.7e-01
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    Ran GUO, Yue-Ming WANG. A self-calibration method of the boresight angles of airborne hyperspectral VNIR/SWIR modules[J]. Journal of Infrared and Millimeter Waves, 2023, 42(6): 851

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    Paper Information

    Category: Research Articles

    Received: Feb. 1, 2023

    Accepted: --

    Published Online: Dec. 26, 2023

    The Author Email: Yue-Ming WANG (wangym@mail.sitp.ac.cn)

    DOI:10.11972/j.issn.1001-9014.2023.06.019

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