OpenCV Build Scripts

linux-amd64-pc

• Build on a Linux system (assumed to be amd64 / x86_64)
• Setup a chroot (to build on older distro for glibc compatibility)

  # Use different package manager if not debian based system
  sudo apt install schroot debootstrap
  
  # Make chroot
  sudo debootstrap --variant=buildd --arch=amd64 focal /srv/chroot/focal-amd64 http://archive.ubuntu.com/ubuntu/

• Write chroot config file /etc/schroot/chroot.d/focal-amd64.conf

  [focal-amd64]
  description=Ubuntu 20.04 (amd64)
  type=directory
  directory=/srv/chroot/focal-amd64
  users=[YOUR_USERNAME]
  root-groups=root
  profile=desktop
  personality=linux
  

• On more recent Ubuntu / Debian systems, yescrypt is used, but this is not supported in older systems (focal included). Thus change /etc/pam.d/common-password by modifying yescrypt to be sha512. Failing to do so will prevent sudo from working in the chroot environment.
• Enter chroot with sudo schroot -c focal-amd64 and run

  sed -i 's/focal main/focal main universe multiverse/g' /etc/apt/sources.list
  apt update
  apt install sudo locales git python3 zip
  exit

• Enter the chroot without sudo schroot -c focal-amd64
• Run the build

  cd linux-amd64-pc
  ./buildopencv.sh | tee build.log
  cd build
  zip -0 linux-amd64-pc.zip OpenCV-*.deb OpenCV-*.tar.gz OpenCV-*.sh

• Upload the sh file

linux-arm64-pc

• Build on a Linux system (assumed to be amd64 / x86_64)
• Setup a chroot (to build on older distro for glibc compatibility)

  # Use different package manager if not debian based system
  sudo apt install schroot debootstrap qemu-user-static
  
  # Make chroot
  sudo debootstrap --variant=buildd --arch=arm64 focal /srv/chroot/focal-arm64 http://ports.ubuntu.com/ubuntu-ports

• Write chroot config file /etc/schroot/chroot.d/focal-arm64.conf

  [focal-arm64]
  description=Ubuntu 20.04 (arm64)
  type=directory
  directory=/srv/chroot/focal-arm64
  users=[YOUR_USERNAME]
  root-groups=root
  profile=desktop
  personality=linux
  

• On more recent Ubuntu / Debian systems, yescrypt is used, but this is not supported in older systems (focal included). Thus change /etc/pam.d/common-password by modifying yescrypt to be sha512. Failing to do so will prevent sudo from working in the chroot environment.
• Enter chroot with sudo schroot -c focal-arm64 and run

  sed -i 's/focal main/focal main universe multiverse/g' /etc/apt/sources.list
  apt update
  apt install sudo locales git python3 zip
  exit

• Enter the chroot without sudo schroot -c focal-arm64
• Run the build

  cd linux-arm64-pc
  ./buildopencv.sh | tee build.log

• Upload the sh file

linux-arm64-jetsonnano

Note: you can build natively on a Jetson Nano. However, you may need a swapfile on the SD card. Also, if building on the jetson nano, change BUILD_THREADS to 1 in the build script.

• Build on a Linux system (assumed to be amd64 / x86_64)
• Setup a chroot using an Ubuntu Focal Jetson nano image link

  # Use different package manager if not debian based system
  sudo apt install schroot qemu-user-static
  
  # Mount image
  sudo losetup -f -P --show ./jetson-image.img
  sudo mkdir /srv/chroot/jetson-image
  sudo mount /dev/loop# /srv/chroot/jetson-image

• Write chroot config file /etc/schroot/chroot.d/focal-arm64.conf

  [jetson-image]
  description=Jetson OS Image
  type=directory
  directory=/srv/chroot/jetson-image
  users=[YOUR_USERNAME]
  root-groups=root
  profile=desktop
  personality=linux
  

• On more recent Ubuntu / Debian systems, yescrypt is used, but this is not supported in older systems (focal included). Thus change /etc/pam.d/common-password by modifying yescrypt to be sha512. Failing to do so will prevent sudo from working in the chroot environment.
• Enter chroot with sudo schroot -c jetson-image and run

  sed -i 's/focal main/focal main universe multiverse/g' /etc/apt/sources.list
  apt update
  apt install sudo locales git python3 zip
  exit

• Enter the chroot without sudo schroot -c jetson-image
• Run the build

  cd linux-arm64-jetsonnano
  ./buildopencv.sh | tee build.log

• Upload the sh file

windows-amd64-pc

• Install the following
  • CMake: Make sure cmake is in your PATH
  • Build Tools for Visual Studio
  • GStreamer: Use the "MSVC development installer" and perform a "complete install"
  • OpenJDK 11: Make sure JAVA_HOME is set to the directory java is installed in (not the bin, the root directory). Alternatively, you can make sure the desired java is in your PATH.
  • Apache ANT: Make sure ant is in your path
  • Python 3.8: Make sure the desired python is the first item in your path and is named python3 not python (just rename the exe file).
  • NumPy (python3 -m pip install numpy)
• Note that the build script requires Windows 10 17063 or later which includes curl and bsdtar
• Run the build

  cd windows-arm64-pc
  .\buildopencv.cmd
  cd build

• Upload the installer