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ROS TF变换定义分析 #29

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Durant35 opened this issue May 30, 2018 · 2 comments
Open

ROS TF变换定义分析 #29

Durant35 opened this issue May 30, 2018 · 2 comments

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@Durant35
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static_transform_publisher x y z yaw pitch roll frame_id child_frame_id period_in_ms
static_transform_publisher x y z qx qy qz qw frame_id child_frame_id  period_in_ms 
  • 定义了T: frame_id --> child_frame_id
@Durant35
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高翔《视觉SLAM十四讲》

  • 设某个点在世界坐标系中的坐标p_w,在相机坐标系下为p_c,那么:p_c = T_{cw} p_w
  • T_{cw} 表示世界坐标系到相机坐标系间的变换,或者反过来的T_{wc}p_w = T_{wc} p_c = T_{cw}^{-1} p_c
  • T_{wc}直接表示相机在何处,即相机在世界坐标系下的坐标,更为直观;实践当中使用T_{cw}更为常见

@Durant35
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TF定义了child_frame_id坐标系到frame_id坐标系的变换T

更为直观的理解是child_frame_id坐标系在frame_id坐标系下的坐标

左乘T可以将child_frame_id坐标系下的点转换到frame_id坐标系

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