Installing OpenCV 4.2.0 on FriendlyCore/FriendlyDesktop

The easiest way to install it is to run FriendlyELEC's script.
Here are the packages and utilities your system will have after you follow the instructions in this tutorial:

• Qt 5.10.0 version of the HighGUI module (Better 2D window interface with zoom, image saving capabilities, etc)
• C++ interface and examples
• C interface and examples
• Python 3.6+ interface and examples

Currently supported boards

• RK3399
  NanoPC T4
  NanoPC M4
  NanoPC NEO4
  Som-RK3399

If you are using the s5p4418/s5p6818 development board, please checkout to the "s5pxx18" branch.

Installation

Note: OpenCV has been pre-installed in FriendlyCore/FriendlyDesktop (Version after 201905) and does not require manual installation.
Please download the latest FriendlyCore/FriendlyDesktop Image file from the following URL: http://download.friendlyarm.com

To make it easy to test python3 examples, you may copy cv-env.sh to the system directory，run the commands below:

git clone https://github.com/friendlyarm/install-opencv-on-friendlycore
cd install-opencv-on-friendlycore
cp examples/py/cv-env.sh /usr/bin/

Test out the OpenCV 4.2.0 and Python3 install

Run the commands below:

cd ~/install-opencv-on-friendlycore/examples/py/
. cv-env.sh
python ver.py

Will display:

4.2.0

it will activate a virtualenv, if you want to switch projects or otherwise leave your virtualenv, simply run:

deactivate 

Test python sample included in OpenCV 4.2.0: turing

. ~/install-opencv-on-friendlycore/cv-env.sh
. setqt5env
cd /usr/local/share/opencv4/samples/python
python turing.py

Build Qt5 MIPI-Camera example

Note: To run this demo you will need a camera(ov13850/ov4689/logitech c920 pro) and a display connected.
Run the commands below:

cd ~/install-opencv-on-friendlycore/examples/qt5/mipi-camera-videoprocessor/
qmake-qt5 .
make -j4

Run on FriendlyDesktop:

su pi
. setqt5env
export DISPLAY=:0.0
./mipi-camera-videoprocessor

Run on FriendlyCore:

./run-on-friendlycore.sh

Python: Stereo match example

Run the commands below:

cd ~/install-opencv-on-friendlycore/examples/py/single-camera-python-demo/
./run.sh

Python: Test single camera example

Note: To run this demo you will need a camera(ov13850/ov4689/logitech c920 pro) and a display connected.
Run the commands below:

cd ~/install-opencv-on-friendlycore/examples/py/single-camera-python-demo/
./run.sh

Python: Test dual camera example

Note: To run this demo you will need two cameras(ov13850/ov4689/logitech c920 pro) and a display connected.
Run the commands below:

cd ~/install-opencv-on-friendlycore/examples/py/dual-camera-python-demo/
./run.sh

C++: Test UVC camera example

Note: To run this demo you will need a usb camera(logitech c920 pro) and a display connected.
Build and run the commands below:

git clone https://github.com/friendlyarm/rk3399-opencv-uvccamera-cpp-demo.git
cd rk3399-opencv-uvccamera-cpp-demo
mkdir build
cd build
cmake ..
make
su pi
export DISPLAY=:0.0
. setqt5env
./opencamera