buildOpenCV

Script for building OpenCV 3 on the NVIDIA Jetson Nano Developer Kit

Building for:

• Jetson Nano
• L4T 32.2.1/JetPack 4.2.2
• OpenCV 3.4.6
• Packaging Option ( Builds package by default; --no_package does not build package)

Note: The script does not check to see which version of L4T is running before building, understand the script may only work with the stated versions.

Building

This is a long build, you may want to write to a log file, for example:

$ ./buildOpenCV.sh |& tee openCV_build.log

While the build will still be written to the console, the build log will be written to openCV_build.log for later review.

On the Jetson Nano, this is a challenging build. There is not enough memory on the Nano to make with multiple jobs (i.e)

$ make -j4

without using a significant amount of swap file space. With L4T 32.2.1, there is a default swap space. However, if you are using a SD card, this can result in long compile times as both physcial memory and the swap file memory exhaust. Recommend using a USB drive for building. If you use a SD card, consider setting the environment variable NUM_JOBS in the buildOpenCV.sh script to 1. The build time may be longer, but you will not have the same amount of memory/SD card thrashing. If you are using a USB drive, you may want to add a swapfile: https://github.com/JetsonHacksNano/installSwapfile.

Note that if you are building for Python, you most definitely will benefit from building with a swap file and running on a USB drive. See: https://github.com/JetsonHacksNano/installSwapfile

Usage

usage: ./buildOpenCV.sh [[-s sourcedir ] | [-h]]
     -s | --sourcedir Directory in which to place the opencv sources (default $HOME ; this is usually ~/)
     -i | --installdir Directory in which to install opencv libraries (default /usr/local)
     --no_package Do not package OpenCV as .deb file (default is true)
     -h | --help Print help

Build Parameters

OpenCV is a very rich environment, with many different options available. Check the script to make sure that the options you need are included/excluded. By default, the buildOpenCV.sh script selects these major options:

• CUDA on
• GStreamer
• V4L - (Video for Linux)
• QT - (No gtk support built in)
• Python 2 bindings
• Python 3 bindings

Notes

chmod +x buildOpenCV.sh
./buildOpenCV.sh