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Update kimera_vio_install.md: modify opencv cmake command #237

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Update kimera_vio_install.md: modify opencv cmake command #237

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6 changes: 3 additions & 3 deletions docs/kimera_vio_install.md
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Expand Up @@ -111,14 +111,14 @@ sudo make -j $(nproc) install

Note that you can use `apt-get install libopencv-dev libopencv-contrib-dev` on 20.04 instead of building from source.

Download OpenCV and run cmake:
Download OpenCV and [opencv_contrib](https://github.com/opencv/opencv_contrib) and run cmake:
```bash
git clone https://github.com/opencv/opencv.git
cd opencv
git checkout tags/4.2 # 3.4 or higher should be fine
mkdir build
cd build
cmake -DWITH_VTK=On .. # Use -DWITH_TBB=On if you have TBB
cmake -DOPENCV_EXTRA_MODULES_PATH=<path to opencv_contrib>/opencv_contrib/modules -DWITH_VTK=On .. # Use -DWITH_TBB=On if you have TBB
```

Finally, build and install OpenCV:
Expand All @@ -142,7 +142,7 @@ sudo make -j $(nproc) install

Finally, go to the OpenCV build folder and build and install OpenCV:
```bash
cmake -DWITH_VTK=On .. # now VTK should be correctly detected, Use -DWITH_TBB=On if you have TBB
cmake -DOPENCV_EXTRA_MODULES_PATH=<path to opencv_contrib>/opencv_contrib/modules -DWITH_VTK=On .. # now VTK should be correctly detected, Use -DWITH_TBB=On if you have TBB
sudo make -j $(nproc) install
```

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