Radxa Wiki - User contributions [en]

Rockpi4/dev/install-opencv

2022-07-18T07:27:59Z

Rust: /* Dependencies */

{{rockpi4_header}}
{{Languages|rockpi4/dev/install-opencv}}
[[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.

== Compile OpenCV (4.0.1)==

To compile OpenCV on ROCK Pi, we need at least 4GB ram and we recommend to compile on ubuntu arm64 images.

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

To use OpenCV, an 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.

== Compile OpenCV (4.6.0) ==

=== Requirements ===

RAM >= 2G

Debian >= 10

=== Download Source Code ===

[https://opencv.org/releases/ Releases - OpenCV]

=== Dependencies ===

apt install build-essential cmake pkg-config ccache git
apt install python2 python3 python3-pip
apt install qt5-default
apt install libpng-dev libjpeg-dev
apt install libeigen3-dev
apt install ffmpeg libavcodec-dev libavformat-dev libswscale-dev libavresample-dev
apt install libgstreamer1.0-dev libgstreamermm-1.0-dev
apt install libgtk-3-dev libgtkglext1-dev libgtkglextmm-x11-1.2-dev

pip3 install numpy

Download `OpenBLAS` (Basic Linear Algebra Subprograms)

[http://www.openblas.net/ OpenBLAS : An optimized BLAS library]

# tar && cd project dir
make
sudo make install

* `qt5-default` may not be found in many apt source but there should be substitution
* `build-essential` `cmake` `pkg-config` `ccache` `git` essential to build
* `libpng-dev` `libjpeg-dev` image files surpport
* `libeigen3-dev` linear algebra surpport
* `ffmpeg` `libavcodec-dev` `libavformat-dev` `libswscale-dev` `libavresample-dev` video files surpport
* `libgstreamer1.0-dev` `libgstreamermm-1.0-dev` stream media surpport
* `libgtk-3-dev` `libgtkglext1-dev` `libgtkglextmm-x11-1.2-dev` GUI lib

=== Build ===

# tar && cd project dir
mkdir -p build && cd build
# generate makefile
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_PREFIX=/opt/opencv -DWITH_OPENGL=ON -DOPENCV_ENABLE_NONFREE=ON -DWITH_QT=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_1394=OFF -DBUILD_opencv_python2=OFF -DBUILD_opencv_python3=ON -DPYTHON3_LIBRARY=$(python3 -c "from distutils.sysconfig import get_config_var;from os.path import dirname,join ; print(join(dirname(get_config_var('LIBPC')),get_config_var('LDLIBRARY')))") -DPYTHON3_NUMPY_INCLUDE_DIRS=$(python3 -c "import numpy; print(numpy.get_include())") -DPYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")

* ''WITH_OPENGL''=ON : enables OpenGL hardware acceleration surpport

* ''CMAKE_BUILD_TYPE''=Release : or Debug if you want

* ''CMAKE_VERBOSE_MAKEFILE''=ON : easy to find errors

* ''OPENCV_ENABLE_NONFREE''=ON : Some algorithms included in the library are known to be protected by patents and are disabled by default

* ''CMAKE_INSTALL_PREFIX''=/opt/opencv： To install produced binaries root location

* ''WITH_QT''=ON : use Qt to draw a window

* ''BUILD_TESTS''=OFF，''BUILD_PERF_TESTS''=OFF：shorten the build time

* ''OPENCV_GENERATE_PKGCONFIG''=ON： enables `.pc` file generation along with standard CMake package

* For more information, [https://docs.opencv.org/4.6.0/db/d05/tutorial_config_reference.html OpenCV: OpenCV configuration options reference]

result output may look like below：

-- General configuration for OpenCV 4.6.0 =====================================
-- Version control: unknown
--
-- Platform:
-- Timestamp: 2022-07-13T07:48:24Z
-- Host: Linux 4.4.154-116-rockchip-g86a614bc15b3 aarch64
-- CMake: 3.13.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: Release
--
-- CPU/HW features:
-- Baseline: NEON FP16
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 8.3.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- ccache: YES
-- Precompiled headers: NO
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo stitching video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: java python2 python3 ts
-- Applications: apps
-- Documentation: NO
-- Non-free algorithms: YES
--
-- GUI: QT5
-- QT: YES (ver 5.11.3 )
-- QT OpenGL support: YES (Qt5::OpenGL 5.11.3)
-- GTK+: YES (ver 3.24.5)
-- GThread : YES (ver 2.58.3)
-- GtkGlExt: YES (ver 1.2.0)
-- OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so)
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 62)
-- WEBP: build (ver encoder: 0x020f)
-- PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.36)
-- TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
-- JPEG 2000: build (ver 2.4.0)
-- OpenEXR: /usr/lib/aarch64-linux-gnu/libImath.so /usr/lib/aarch64-linux-gnu/libIlmImf.so /usr/lib/aarch64-linux-gnu/libIex.so /usr/lib/aarch64-linux-gnu/libHalf.so /usr/lib/aarch64-linux-gnu/libIlmThread.so (ver 2_2)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
-- FFMPEG: YES
-- avcodec: YES (58.35.100)
-- avformat: YES (58.20.100)
-- avutil: YES (56.22.100)
-- swscale: YES (5.3.100)
-- avresample: YES (4.0.0)
-- GStreamer: YES (1.14.4)
-- v4l/v4l2: YES (linux/videodev2.h)
--
-- Parallel framework: pthreads
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Lapack: YES (/opt/OpenBLAS/lib/libopenblas.so)
-- Eigen: YES (ver 3.3.7)
-- Custom HAL: YES (carotene (ver 0.0.1))
-- Protobuf: build (3.19.1)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/rock/OpenCV/opencv-4.6.0/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.7.3)
-- Libraries: NO
-- numpy: /home/rock/.local/lib/python3.7/site-packages/numpy/core/include (ver 1.16.2)
-- install path: -
--
-- Python (for build): /usr/bin/python2.7
--
-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /usr/local
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/rock/OpenCV/opencv-4.6.0/build

check the output，install dependencies and reuse the full `cmake` command to make item to '''YES''' if it interests you

eg. ''OpenGL Support'' and ''OpenCL'' should be '''YES''' if you want full hardware acceleration feature

After the generation, make :

make all
#or make all -j$(grep -c ^processor /proc/cpuinfo)
make install

== Troubleshooting ==

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

Rockpi4/dev/install-opencv

2022-07-18T07:26:44Z

Rust: /* Build */

{{rockpi4_header}}
{{Languages|rockpi4/dev/install-opencv}}
[[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.

== Compile OpenCV (4.0.1)==

To compile OpenCV on ROCK Pi, we need at least 4GB ram and we recommend to compile on ubuntu arm64 images.

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

To use OpenCV, an 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.

== Compile OpenCV (4.6.0) ==

=== Requirements ===

RAM >= 2G

Debian >= 10

=== Download Source Code ===

[https://opencv.org/releases/ Releases - OpenCV]

=== Dependencies ===

apt install build-essential cmake pkg-config ccache git
apt install python2 python3 python3-pip
apt install qt5-default
apt install libpng-dev libjpeg-dev
apt install libeigen3-dev
apt install ffmpeg libavcodec-dev libavformat-dev libswscale-dev libavresample-dev
apt install libgstreamer1.0-dev libgstreamermm-1.0-dev
apt install libgtk-3-dev libgtkglext1-dev libgtkglextmm-x11-1.2-dev

pip3 install numpy

Download `OpenBLAS` (Basic Linear Algebra Subprograms)

[http://www.openblas.net/ OpenBLAS : An optimized BLAS library]()

# tar && cd project dir
make
sudo make install

* `qt5-default` may not be found in many apt source but there should be substitution
* `build-essential` `cmake` `pkg-config` `ccache` `git` essential to build
* `libpng-dev` `libjpeg-dev` image files surpport
* `libeigen3-dev` linear algebra surpport
* `ffmpeg` `libavcodec-dev` `libavformat-dev` `libswscale-dev` `libavresample-dev` video files surpport
* `libgstreamer1.0-dev` `libgstreamermm-1.0-dev` stream media surpport
* `libgtk-3-dev` `libgtkglext1-dev` `libgtkglextmm-x11-1.2-dev` GUI lib

=== Build ===

# tar && cd project dir
mkdir -p build && cd build
# generate makefile
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_PREFIX=/opt/opencv -DWITH_OPENGL=ON -DOPENCV_ENABLE_NONFREE=ON -DWITH_QT=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_1394=OFF -DBUILD_opencv_python2=OFF -DBUILD_opencv_python3=ON -DPYTHON3_LIBRARY=$(python3 -c "from distutils.sysconfig import get_config_var;from os.path import dirname,join ; print(join(dirname(get_config_var('LIBPC')),get_config_var('LDLIBRARY')))") -DPYTHON3_NUMPY_INCLUDE_DIRS=$(python3 -c "import numpy; print(numpy.get_include())") -DPYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")

* ''WITH_OPENGL''=ON : enables OpenGL hardware acceleration surpport

* ''CMAKE_BUILD_TYPE''=Release : or Debug if you want

* ''CMAKE_VERBOSE_MAKEFILE''=ON : easy to find errors

* ''OPENCV_ENABLE_NONFREE''=ON : Some algorithms included in the library are known to be protected by patents and are disabled by default

* ''CMAKE_INSTALL_PREFIX''=/opt/opencv： To install produced binaries root location

* ''WITH_QT''=ON : use Qt to draw a window

* ''BUILD_TESTS''=OFF，''BUILD_PERF_TESTS''=OFF：shorten the build time

* ''OPENCV_GENERATE_PKGCONFIG''=ON： enables `.pc` file generation along with standard CMake package

* For more information, [https://docs.opencv.org/4.6.0/db/d05/tutorial_config_reference.html OpenCV: OpenCV configuration options reference]

result output may look like below：

-- General configuration for OpenCV 4.6.0 =====================================
-- Version control: unknown
--
-- Platform:
-- Timestamp: 2022-07-13T07:48:24Z
-- Host: Linux 4.4.154-116-rockchip-g86a614bc15b3 aarch64
-- CMake: 3.13.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: Release
--
-- CPU/HW features:
-- Baseline: NEON FP16
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 8.3.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- ccache: YES
-- Precompiled headers: NO
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo stitching video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: java python2 python3 ts
-- Applications: apps
-- Documentation: NO
-- Non-free algorithms: YES
--
-- GUI: QT5
-- QT: YES (ver 5.11.3 )
-- QT OpenGL support: YES (Qt5::OpenGL 5.11.3)
-- GTK+: YES (ver 3.24.5)
-- GThread : YES (ver 2.58.3)
-- GtkGlExt: YES (ver 1.2.0)
-- OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so)
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 62)
-- WEBP: build (ver encoder: 0x020f)
-- PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.36)
-- TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
-- JPEG 2000: build (ver 2.4.0)
-- OpenEXR: /usr/lib/aarch64-linux-gnu/libImath.so /usr/lib/aarch64-linux-gnu/libIlmImf.so /usr/lib/aarch64-linux-gnu/libIex.so /usr/lib/aarch64-linux-gnu/libHalf.so /usr/lib/aarch64-linux-gnu/libIlmThread.so (ver 2_2)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
-- FFMPEG: YES
-- avcodec: YES (58.35.100)
-- avformat: YES (58.20.100)
-- avutil: YES (56.22.100)
-- swscale: YES (5.3.100)
-- avresample: YES (4.0.0)
-- GStreamer: YES (1.14.4)
-- v4l/v4l2: YES (linux/videodev2.h)
--
-- Parallel framework: pthreads
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Lapack: YES (/opt/OpenBLAS/lib/libopenblas.so)
-- Eigen: YES (ver 3.3.7)
-- Custom HAL: YES (carotene (ver 0.0.1))
-- Protobuf: build (3.19.1)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/rock/OpenCV/opencv-4.6.0/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.7.3)
-- Libraries: NO
-- numpy: /home/rock/.local/lib/python3.7/site-packages/numpy/core/include (ver 1.16.2)
-- install path: -
--
-- Python (for build): /usr/bin/python2.7
--
-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /usr/local
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/rock/OpenCV/opencv-4.6.0/build

check the output，install dependencies and reuse the full `cmake` command to make item to '''YES''' if it interests you

eg. ''OpenGL Support'' and ''OpenCL'' should be '''YES''' if you want full hardware acceleration feature

After the generation, make :

make all
#or make all -j$(grep -c ^processor /proc/cpuinfo)
make install

== Troubleshooting ==

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

Rockpi4/dev/install-opencv

2022-07-18T07:21:22Z

Rust: /* Build */

{{rockpi4_header}}
{{Languages|rockpi4/dev/install-opencv}}
[[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.

== Compile OpenCV (4.0.1)==

To compile OpenCV on ROCK Pi, we need at least 4GB ram and we recommend to compile on ubuntu arm64 images.

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

To use OpenCV, an 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.

== Compile OpenCV (4.6.0) ==

=== Requirements ===

RAM >= 2G

Debian >= 10

=== Download Source Code ===

[https://opencv.org/releases/ Releases - OpenCV]

=== Dependencies ===

apt install build-essential cmake pkg-config ccache git
apt install python2 python3 python3-pip
apt install qt5-default
apt install libpng-dev libjpeg-dev
apt install libeigen3-dev
apt install ffmpeg libavcodec-dev libavformat-dev libswscale-dev libavresample-dev
apt install libgstreamer1.0-dev libgstreamermm-1.0-dev
apt install libgtk-3-dev libgtkglext1-dev libgtkglextmm-x11-1.2-dev

pip3 install numpy

Download `OpenBLAS` (Basic Linear Algebra Subprograms)

[http://www.openblas.net/ OpenBLAS : An optimized BLAS library]()

# tar && cd project dir
make
sudo make install

* `qt5-default` may not be found in many apt source but there should be substitution
* `build-essential` `cmake` `pkg-config` `ccache` `git` essential to build
* `libpng-dev` `libjpeg-dev` image files surpport
* `libeigen3-dev` linear algebra surpport
* `ffmpeg` `libavcodec-dev` `libavformat-dev` `libswscale-dev` `libavresample-dev` video files surpport
* `libgstreamer1.0-dev` `libgstreamermm-1.0-dev` stream media surpport
* `libgtk-3-dev` `libgtkglext1-dev` `libgtkglextmm-x11-1.2-dev` GUI lib

=== Build ===

# tar && cd project dir
mkdir -p build && cd build
# generate makefile
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_PREFIX=/opt/opencv -DWITH_OPENGL=ON -DOPENCV_ENABLE_NONFREE=ON -DWITH_QT=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_1394=OFF -DBUILD_opencv_python2=OFF -DBUILD_opencv_python3=ON -DPYTHON3_LIBRARY=$(python3 -c "from distutils.sysconfig import get_config_var;from os.path import dirname,join ; print(join(dirname(get_config_var('LIBPC')),get_config_var('LDLIBRARY')))") -DPYTHON3_NUMPY_INCLUDE_DIRS=$(python3 -c "import numpy; print(numpy.get_include())") -DPYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")

* `WITH_OPENGL`=ON : enables OpenGL hardware acceleration surpport

* `CMAKE_BUILD_TYPE`=Release : or Debug if you want

* `CMAKE_VERBOSE_MAKEFILE`=ON : easy to find errors

* `OPENCV_ENABLE_NONFREE`=ON : Some algorithms included in the library are known to be protected by patents and are disabled by default

* `CMAKE_INSTALL_PREFIX`=/opt/opencv： To install produced binaries root location

* `WITH_QT`=ON : use Qt to draw a window

* `BUILD_TESTS`=OFF，`BUILD_PERF_TESTS`=OFF：shorten the build time

* `OPENCV_GENERATE_PKGCONFIG`=ON： enables `.pc` file generation along with standard CMake package

* For more information, [https://docs.opencv.org/4.6.0/db/d05/tutorial_config_reference.html OpenCV: OpenCV configuration options reference]

result output may look like below：

-- General configuration for OpenCV 4.6.0 =====================================
-- Version control: unknown
--
-- Platform:
-- Timestamp: 2022-07-13T07:48:24Z
-- Host: Linux 4.4.154-116-rockchip-g86a614bc15b3 aarch64
-- CMake: 3.13.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: Release
--
-- CPU/HW features:
-- Baseline: NEON FP16
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 8.3.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- ccache: YES
-- Precompiled headers: NO
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo stitching video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: java python2 python3 ts
-- Applications: apps
-- Documentation: NO
-- Non-free algorithms: YES
--
-- GUI: QT5
-- QT: YES (ver 5.11.3 )
-- QT OpenGL support: YES (Qt5::OpenGL 5.11.3)
-- GTK+: YES (ver 3.24.5)
-- GThread : YES (ver 2.58.3)
-- GtkGlExt: YES (ver 1.2.0)
-- OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so)
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 62)
-- WEBP: build (ver encoder: 0x020f)
-- PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.36)
-- TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
-- JPEG 2000: build (ver 2.4.0)
-- OpenEXR: /usr/lib/aarch64-linux-gnu/libImath.so /usr/lib/aarch64-linux-gnu/libIlmImf.so /usr/lib/aarch64-linux-gnu/libIex.so /usr/lib/aarch64-linux-gnu/libHalf.so /usr/lib/aarch64-linux-gnu/libIlmThread.so (ver 2_2)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
-- FFMPEG: YES
-- avcodec: YES (58.35.100)
-- avformat: YES (58.20.100)
-- avutil: YES (56.22.100)
-- swscale: YES (5.3.100)
-- avresample: YES (4.0.0)
-- GStreamer: YES (1.14.4)
-- v4l/v4l2: YES (linux/videodev2.h)
--
-- Parallel framework: pthreads
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Lapack: YES (/opt/OpenBLAS/lib/libopenblas.so)
-- Eigen: YES (ver 3.3.7)
-- Custom HAL: YES (carotene (ver 0.0.1))
-- Protobuf: build (3.19.1)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/rock/OpenCV/opencv-4.6.0/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.7.3)
-- Libraries: NO
-- numpy: /home/rock/.local/lib/python3.7/site-packages/numpy/core/include (ver 1.16.2)
-- install path: -
--
-- Python (for build): /usr/bin/python2.7
--
-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /usr/local
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/rock/OpenCV/opencv-4.6.0/build

check the output，install dependencies and reuse the full `cmake` command to make item to '''YES''' if it interests you

eg. `OpenGL Support` and `OpenCL` should be '''YES''' if you want full hardware acceleration feature

After the generation, make :

make all
#or make all -j$(grep -c ^processor /proc/cpuinfo)
make install

== Troubleshooting ==

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

Rockpi4/dev/install-opencv

2022-07-18T07:19:59Z

Rust: /* Compile OpenCV */

{{rockpi4_header}}
{{Languages|rockpi4/dev/install-opencv}}
[[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.

== Compile OpenCV (4.0.1)==

To compile OpenCV on ROCK Pi, we need at least 4GB ram and we recommend to compile on ubuntu arm64 images.

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

To use OpenCV, an 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.

== Compile OpenCV (4.6.0) ==

=== Requirements ===

RAM >= 2G

Debian >= 10

=== Download Source Code ===

[https://opencv.org/releases/ Releases - OpenCV]

=== Dependencies ===

apt install build-essential cmake pkg-config ccache git
apt install python2 python3 python3-pip
apt install qt5-default
apt install libpng-dev libjpeg-dev
apt install libeigen3-dev
apt install ffmpeg libavcodec-dev libavformat-dev libswscale-dev libavresample-dev
apt install libgstreamer1.0-dev libgstreamermm-1.0-dev
apt install libgtk-3-dev libgtkglext1-dev libgtkglextmm-x11-1.2-dev

pip3 install numpy

Download `OpenBLAS` (Basic Linear Algebra Subprograms)

[http://www.openblas.net/ OpenBLAS : An optimized BLAS library]()

# tar && cd project dir
make
sudo make install

* `qt5-default` may not be found in many apt source but there should be substitution
* `build-essential` `cmake` `pkg-config` `ccache` `git` essential to build
* `libpng-dev` `libjpeg-dev` image files surpport
* `libeigen3-dev` linear algebra surpport
* `ffmpeg` `libavcodec-dev` `libavformat-dev` `libswscale-dev` `libavresample-dev` video files surpport
* `libgstreamer1.0-dev` `libgstreamermm-1.0-dev` stream media surpport
* `libgtk-3-dev` `libgtkglext1-dev` `libgtkglextmm-x11-1.2-dev` GUI lib

=== Build ===

# tar && cd project dir
mkdir -p build && cd build
# generate makefile
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_PREFIX=/opt/opencv -DWITH_OPENGL=ON -DOPENCV_ENABLE_NONFREE=ON -DWITH_QT=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_1394=OFF -DBUILD_opencv_python2=OFF -DBUILD_opencv_python3=ON -DPYTHON3_LIBRARY=$(python3 -c "from distutils.sysconfig import get_config_var;from os.path import dirname,join ; print(join(dirname(get_config_var('LIBPC')),get_config_var('LDLIBRARY')))") -DPYTHON3_NUMPY_INCLUDE_DIRS=$(python3 -c "import numpy; print(numpy.get_include())") -DPYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")

* `WITH_OPENGL`=ON : enables OpenGL hardware acceleration surpport

* `CMAKE_BUILD_TYPE`=Release : or Debug if you want

* `CMAKE_VERBOSE_MAKEFILE`=ON : easy to find errors

* `OPENCV_ENABLE_NONFREE`=ON : Some algorithms included in the library are known to be protected by patents and are disabled by default

* `CMAKE_INSTALL_PREFIX`=/opt/opencv： To install produced binaries root location

* `WITH_QT`=ON : use Qt to draw a window

* `BUILD_TESTS`=OFF，`BUILD_PERF_TESTS`=OFF：shorten the build time

* `OPENCV_GENERATE_PKGCONFIG`=ON： enables `.pc` file generation along with standard CMake package

* For more information, [https://docs.opencv.org/4.6.0/db/d05/tutorial_config_reference.html OpenCV: OpenCV configuration options reference]

result output may look like below：

-- General configuration for OpenCV 4.6.0 =====================================
-- Version control: unknown
--
-- Platform:
-- Timestamp: 2022-07-13T07:48:24Z
-- Host: Linux 4.4.154-116-rockchip-g86a614bc15b3 aarch64
-- CMake: 3.13.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: Release
--
-- CPU/HW features:
-- Baseline: NEON FP16
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 8.3.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- ccache: YES
-- Precompiled headers: NO
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo stitching video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: java python2 python3 ts
-- Applications: apps
-- Documentation: NO
-- Non-free algorithms: YES
--
-- GUI: QT5
-- QT: YES (ver 5.11.3 )
-- QT OpenGL support: YES (Qt5::OpenGL 5.11.3)
-- GTK+: YES (ver 3.24.5)
-- GThread : YES (ver 2.58.3)
-- GtkGlExt: YES (ver 1.2.0)
-- OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so)
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 62)
-- WEBP: build (ver encoder: 0x020f)
-- PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.36)
-- TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
-- JPEG 2000: build (ver 2.4.0)
-- OpenEXR: /usr/lib/aarch64-linux-gnu/libImath.so /usr/lib/aarch64-linux-gnu/libIlmImf.so /usr/lib/aarch64-linux-gnu/libIex.so /usr/lib/aarch64-linux-gnu/libHalf.so /usr/lib/aarch64-linux-gnu/libIlmThread.so (ver 2_2)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
-- FFMPEG: YES
-- avcodec: YES (58.35.100)
-- avformat: YES (58.20.100)
-- avutil: YES (56.22.100)
-- swscale: YES (5.3.100)
-- avresample: YES (4.0.0)
-- GStreamer: YES (1.14.4)
-- v4l/v4l2: YES (linux/videodev2.h)
--
-- Parallel framework: pthreads
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Lapack: YES (/opt/OpenBLAS/lib/libopenblas.so)
-- Eigen: YES (ver 3.3.7)
-- Custom HAL: YES (carotene (ver 0.0.1))
-- Protobuf: build (3.19.1)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/rock/OpenCV/opencv-4.6.0/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.7.3)
-- Libraries: NO
-- numpy: /home/rock/.local/lib/python3.7/site-packages/numpy/core/include (ver 1.16.2)
-- install path: -
--
-- Python (for build): /usr/bin/python2.7
--
-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /usr/local
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/rock/OpenCV/opencv-4.6.0/build

check the output，install dependencies and reuse the full `cmake` command to make item to **YES** if it interests you

eg. `OpenGL Support` and `OpenCL` should be **YES** if you want full hardware acceleration feature

After the generation, make :

make all
#or make all -j$(grep -c ^processor /proc/cpuinfo)
make install

== Troubleshooting ==

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