Stephen: Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/install-opencv}} ROCK Pi 4 > Development > Install OpenCV This..."

2019-01-07T12:38:46Z

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[[rockpi4 | ROCK Pi 4]] > [[rockpi4/dev | Development]] > [[rockpi4/dev/install-opencv | Install OpenCV]]

This a guide to install OpenCV on your ROCK Pi 4 that running Ubuntu. All the instructions are done in terminal.

== Steps Of Install OpenCV ==

=== Step 1: Get Ubuntu running on ROCK Pi 4 ===

To use OpenCV, a OS desktop is necessary. If your ROCK Pi 4 is running Ubuntu but without desktop, you can install Ubuntu mate desktop.

sudo apt install ubuntu-mate-core && sudo apt install ubuntu-mate-desktop

=== Step 2: Install all the recommended packages ===

* Compilers:

$ sudo apt-get install build-essential

* Required:

$ sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

* Recommended optional packages

$ sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev
$ sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libavresample-dev
$ sudo apt install tesseract-ocr cmake-data liblept5

=== Step 3: Download OpenCV source ===

We suggest that you are at the home folder, so that you don't have to change the code in the next steps.

We need to download OpenCV source. OpenCV latest release: [[https://opencv.org/releases.html here]]. As of writing this, the latest release is 4.0.1. For the newer version, just replace the link for the source code zip file.

$ cd ~
$ wget -O opencv.zip https://github.com/opencv/opencv/archive/4.0.1.zip
$ unzip opencv.zip

And we also need to install the contribution packages of OpenCV. Here we get the latest release version:

$ cd ~
$ wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.0.1.zip
$ unzip opencv_contrib.zip

=== Step 4: Configuring and compiling ===

Confifure thte build using cmake:

$ cd ~/opencv-4.0.1/
$ mkdir build
$ cd build
$ export PY_NAME=$(python -c 'from sys import version_info as v; print("python%d.%d" % v[:2])')
$ export PY_NUMPY_DIR=$(python -c 'import os.path, numpy.core; print(os.path.dirname(numpy.core.__file__))')
$ cmake -DCMAKE_BUILD_TYPE=RELEASE \
-DCMAKE_INSTALL_PREFIX=/usr/local \
\
-DPYTHON2_EXECUTABLE=$(which python) \
-DPYTHON_INCLUDE_DIR=/usr/include/$PY_NAME \
-DPYTHON_INCLUDE_DIR2=/usr/include/aarch64-linux-gnu/$PY_NAME \
-DPYTHON_LIBRARY=/usr/lib/aarch64-linux-gnu/lib$PY_NAME.so \
-DPYTHON2_NUMPY_INCLUDE_DIRS=/usr/lib/$PY_NAME/dist-packages/numpy/core/include/ \
\
-DBUILD_DOCS=OFF \
-DBUILD_EXAMPLES=OFF \
-DBUILD_TESTS=OFF \
-DBUILD_PERF_TESTS=OFF \
\
-DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.0.1/modules \
..

Compile OpenCV in the build folder:

$ make -j$(nproc --all)

Install OpenCV in the build folder:

$ sudo make install
$ sudo ldconfig

=== Step 5: Test your building and installation ===

To confirm that you have install ed OpenCV correctly , try this:

rock@linux:~$ python
Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'4.0.1'
>>>

=== Step6: Do the sample supported by OpenCV official ===

$ cd ~/opencv-4.0.1/samples/python
$ python watershed.py

Finally, if you don't need the files in opencv-4.0.1 or opencv_contrib-4.0.1. You can remove them:

$ cd ~
$ rm -rf opencv-4.0.1 opencv_contrib-4.0.1 opencv_contrib.zip opencv.zip

If you follow the code exactly, you will find it working just fine.

== Troubleshooting ==

* Post your issue at the forum: https://forum.radxa.com/c/dev

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