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Update import order in kalibr_calibrate_cameras to fix cv_bridge_boost exception #677

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@aatb-ch aatb-ch commented Mar 8, 2024

This pr fixes an exception i hit on 20.04 Noetic running in a vm on amd64, need to import cv2 before cv_bridge

parallels@ros1vm:~/aatb_ws/src/sparepack_misc/calib$ rosrun kalibr kalibr_calibrate_cameras  --target ../target/april_6x6.yaml  --models pinhole-radtan pinhole-radtan  --topics /oak/left/image_raw /oak/right/image_raw  --bag ../bag/all.bag
importing libraries
Traceback (most recent call last):
  File "/home/parallels/kalibr_ws/devel/lib/kalibr/kalibr_calibrate_cameras", line 15, in <module>
    exec(compile(fh.read(), python_script, 'exec'), context)
  File "/home/parallels/kalibr_ws/src/kalibr/aslam_offline_calibration/kalibr/python/kalibr_calibrate_cameras", line 4, in <module>
    import cv_bridge
  File "/opt/ros/noetic/lib/python3/dist-packages/cv_bridge/__init__.py", line 6, in <module>
    from cv_bridge.boost.cv_bridge_boost import cvtColorForDisplay, getCvType
SystemError: initialization of cv_bridge_boost raised unreported exception

ros-perception/vision_opencv#339
https://answers.ros.org/question/362388/cv_bridge_boost-raised-unreported-exception-when-importing-cv_bridge/

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