1. 程式人生 > >相機校準引數說明

相機校準引數說明

翻譯自https://github.com/ethz-asl/kalibr/wiki/yaml-formats

相機系統校準(camchain.yaml)

該檔案儲存相機的內部和外部引數的校準以及IMU相對於相機的空間和時間校準引數。

每臺攝像機都有以下引數:

  • CAMERA_MODEL
    camera_model(pinhole / omni)(針孔、全向)

  • intrinsics
    包含給定投影型別的內部引數的向量。要素如下:
    pinhole:[fu fv pu pv]
    omn​​i:[xi fu fv pu pv]
    ds:[xi alpha fu fv pu pv]
    eucm:[alpha beta fu fv pu pv]

  • distortion_model
    distortion_model(radtan /equidistant)

  • distortion_coeffs
    失真模型的引數向量

  • T_cn_cnm1
    相機外在轉換,總是相對於鏈中的最後一個相機
    (例如cam1:T_cn_cnm1 = T_c1_c0,將cam0轉換為cam1座標)

  • T_cam_imu
    IMU extrinsics:從IMU到相機座標的轉換(T_c_i)

  • timeshift_cam_imu
    相機和IMU時間戳之間的時間間隔,以秒為單位(t_imu = t_cam + shift)

  • rostopic
    攝像機影象流的主題

  • resolution
    相機解析度[width,height]

示例chain.yaml

cam0:
  camera_model: pinhole
  intrinsics: [461.629, 460.152, 362.680, 246.049]
  distortion_model: radtan
  distortion_coeffs: [-0.27695497, 0.06712482, 0.00087538, 0.00011556]
  T_cam_imu:
  - [0.01779318, 0.99967549,-0.01822936, 0.07008565]
  - [-0.9998017, 0.01795239
, 0.00860714,-0.01771023] - [0.00893160, 0.01807260, 0.99979678, 0.00399246] - [0.0, 0.0, 0.0, 1.0] timeshift_cam_imu: -8.121e-05 rostopic: /cam0/image_raw resolution: [752, 480] cam1: camera_model: omni intrinsics: [0.80065662, 833.006, 830.345, 373.850, 253.749] distortion_model: radtan distortion_coeffs: [-0.33518750, 0.13211436, 0.00055967, 0.00057686] T_cn_cnm1: - [ 0.99998854, 0.00216014, 0.00427195,-0.11003785] - [-0.00221074, 0.99992702, 0.01187697, 0.00045792] - [-0.00424598,-0.01188627, 0.99992034,-0.00064487] - [0.0, 0.0, 0.0, 1.0] T_cam_imu: - [ 0.01567142, 0.99978002,-0.01393948,-0.03997419] - [-0.99966203, 0.01595569, 0.02052137,-0.01735854] - [ 0.02073927, 0.01361317, 0.99969223, 0.00326019] - [0.0, 0.0, 0.0, 1.0] timeshift_cam_imu: -8.681e-05 rostopic: /cam1/image_raw resolution: [752, 480]

IMU配置(imu.yaml)

IMU使用YAML檔案配置。

imu.yaml

#Accelerometers
accelerometer_noise_density: 1.86e-03   #Noise density (continuous-time)
accelerometer_random_walk:   4.33e-04   #Bias random walk

#Gyroscopes
gyroscope_noise_density:     1.87e-04   #Noise density (continuous-time)
gyroscope_random_walk:       2.66e-05   #Bias random walk

rostopic:                    /imu0      #the IMU ROS topic
update_rate:                 200.0      #Hz (for discretization of the values above)