With opencv environment (common Python) in the jetson nano

NVIDIA development board is arm64, so for the source will be replaced to support domestic source of arm64 (not described in detail, but very important)

1. Default has been installed on your jetson nano mirror and start. Open the control terminal, enter the following command dependent libraries

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential python3 python3-dev python3-pip python3-pandas python3-opencv python3-h5py libhdf5-serial-dev hdf5-tools nano ntp

2. Install opencv

• OpenCV is the first step in building on the definition of swap space in Jetson Nano.
• Jetson Nano having 4GB RAM. This is not enough to build OpenCV from source. Therefore, we need to define swap space on Nano to prevent memory corruption

• pip3 install virtualenv
  python3 -m virtualenv -p python3 env 
  echo "source env/bin/activate" >> ~/.bashrc
  source ~/.bashrc
  

  　　

# Turn off swap
sudo swapoff /var/swapfile
# Allocates 4G of additional swap space at /var/swapfile
sudo fallocate -l 4G /var/swapfile
# Permissions
sudo chmod 600 /var/swapfile
# Make swap space
sudo mkswap /var/swapfile
# Turn on swap
sudo swapon /var/swapfile
# Automount swap space on reboot
sudo bash -c 'echo "/var/swapfile swap swap defaults 0 0" >> /etc/fstab'
# Reboot
sudo reboot

　　

Installation opencv dependencies, aptitude to operate by:

Update # 
sudo APT-GET Update 
sudo upgrade APT-GET 
# the Pre-requisites 
sudo aptitude install the unzip cmake Build-Essential pkg-config 
sudo aptitude install libjpeg-dev libpng-dev libtiff-dev 
sudo aptitude install the libavcodec-dev-dev libswscale- libavformat libv4l-dev dev 
sudo aptitude install libxvidcore-dev-dev libx264 

# the following items will tell you there is a conflict, you first select n, y can choose after the second 
sudo aptitude install for libgtk-3-dev 


sudo aptitude install libatlas dev-gfortran the -base 
sudo aptitude install python3-dev

　

Download opencv4.1 source code (you can download their own good and then upload up linux, that is used to upload files xshell6 of rz)

# Create a directory for opencv
mkdir -p projects/cv2
cd projects/cv2
 
# Download sources
wget -O opencv.zip https://github.com/opencv/opencv/archive/4.1.0.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.1.0.zip
 
# Unzip
unzip opencv.zip
unzip opencv_contrib.zip
 
# Rename
mv opencv-4.1.0 opencv
mv opencv_contrib-4.1.0 opencv_contrib

　　

Enter the virtual environment

source ~/env/bin/activate
# Install Numpy
pip install numpy

　　

Create a working paper

# Create a build directory
cd projects/cv2/opencv
mkdir build
cd build

　　

The following code is the path in the build operation

cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D INSTALL_C_EXAMPLES=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    # Contrib path
    -D OPENCV_EXTRA_MODULES_PATH=~/projects/cv2/opencv_contrib/modules \
    # Your virtual environment's Python executable
    # You need to specify the result of echo $(which python)
    -D PYTHON_EXECUTABLE=~/env/bin/python \
    -D BUILD_EXAMPLES=ON ..

　　

Upload the missing file (may be missing):

 https://files.cnblogs.com/files/ikic/boostdesc_bgm.i,vgg_generated_48.i%E7%AD%89.rar

After downloading the above is good, which will put all the files to  opencv_contrib / modules / xfeatures2d / src /

cd projects/cv2/opencv_contrib/modules/xfeatures2d/src/

　　And then upload all the files inside the rz xshell

 

 

 Some would say that if uploading errors, one by one upload.

 

Uploaded back to build working directory after successful

cd projects/cv2/opencv/build

　　

make -j2

　　

During compilation, you encounter some problems:

 Favorite quote pencil word blog (there was no screenshot):

This time, when they went to 73% of the error fatal error: features2d / test /

: No such file or directory
 #include "features2d / the Test / test_detectors_regression.impl.hpp"
          ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~

 

 Encounter this problem,

Is the first document a problem, the following two files in the folder are copied to opencv_contrib / modules / xfeatures2d / test

In open this file, modify the file nod.

 

 

After modify the file copy and paste the error

The following sentence into
 #include "features2d / test / test_detectors_regression.impl.hpp"
 and so on, where you modify the header include error where the file, which file is missing that will move over from opencv

 

 

 

These errors after modification operation (re-run)

make -j2

　

Until all run behind success

In the build installed opencv

# Install OpenCV
sudo make install
sudo ldconfig

　　

The constructed OpenCV library linked to the virtual environment virtualenv

Go to the WHERE at The Folder # OpenCV's Native Library IS Built 
cd /usr/local/lib/python3.6/site-packages/cv2/python-3.6 
ls 
# Rename (xxx is an alternative, after the results of ls to look at Back to modify) 
mv cv2.cpython-36m-xxx-linux-gnu.so cv2.so 
# Go to your Virtual Environments Site-Packages Standard Package Folder 
cd ~ / env / lib / python3.6 / Site-Packages Standard Package / 
# Symlink at The Native Library 
ln -s /usr/local/lib/python3.6/site-packages/cv2/python-3.6/cv2.so cv2.so

　　This is done