[Jetson_nano] Install opencv 4.1

Add Swap Memory

$  sudo apt-get install zram-config

$ sudo gedit /usr/bin/init-zram-swapping

Replace the line:
mem=$(((totalmem / 2 / ${NRDEVICES}) * 1024))

with this line:

mem=$(((totalmem / ${NRDEVICES}) * 1024))

 

And then reboot.

 

Install Opencv 4.1

1. Updating the packages:

$ sudo apt update
$ sudo apt install -y build-essential cmake git libgtk2.0-dev pkg-config libswscale-dev libtbb2 libtbb-dev
$ sudo apt install -y python-dev python3-dev python-numpy python3-numpy
$ sudo apt install -y curl

 

2. Install video & image formats:

$ sudo apt install -y libjpeg-dev libpng-dev libtiff-dev libjasper-dev
$ sudo apt install -y libavcodec-dev libavformat-dev
$ sudo apt install -y libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
$ sudo apt install -y libv4l-dev v4l-utils qv4l2 v4l2ucp libdc1394-22-dev

 

3. Download OpenCV & Contribs Modules:

$ curl -L https://github.com/opencv/opencv/archive/4.1.0.zip -o opencv-4.1.0.zip
$ curl -L https://github.com/opencv/opencv_contrib/archive/4.1.0.zip -o opencv_contrib-4.1.0.zip

 

4. Unzipping packages:

$ unzip opencv-4.1.0.zip
$ unzip opencv_contrib-4.1.0.zip
$ cd opencv-4.1.0/

 

5. Create directory:

$ mkdir release
$ cd release/

 

6. Build Opencv using Cmake:

cmake 	-D WITH_CUDA=ON \
		-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.1.0/modules \
		-D WITH_GSTREAMER=ON \
		-D WITH_LIBV4L=ON \
		-D BUILD_opencv_python2=ON \
		-D BUILD_opencv_python3=ON \
		-D BUILD_TESTS=OFF \
		-D BUILD_PERF_TESTS=OFF \
		-D BUILD_EXAMPLES=OFF \
		-D CMAKE_BUILD_TYPE=RELEASE \
		-D CMAKE_INSTALL_PREFIX=/usr/local ..

 

7. Compile the OpenCV with Contribs Modules:

$ make -j4
$ sudo make install

The installation is now completed.

 

 

> 제대로 설치되었는지 확인

$ pkg-config --modversion opencv
$ pkg-config --libs --cflags opencv

 

---

> 가상환경이 아닌 곳에서는 정상 실행되지만 가상환경에서는 정상실행이 안됨. 그럴때 아래 2번까지만 진행했을때 정상적으로 동작확인. 

 

1. Try search opencv4.pc and notice the location of the file (usr/lib/aarch64-linux-gnu/pkgconfig/)
2. Then rename it to opencv.pc
3. Add `export PKG_CONFIG_PATH=/path/to/` to .bashrc so terminal recognized it.