willprice/README.md

## README.md

      
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    Install OpenCV 4.1.2 on Raspbian Buster
$ chmod +x *.sh
$ ./download-opencv.sh
$ ./install-deps.sh
$ ./build-opencv.sh
$ cd ~/opencv/opencv-4.1.2/build
$ sudo make install
Check you can run test.py using both python 2 and 3 to verify that OpenCV python bindings were successfully installed
$ wget "https://upload.wikimedia.org/wikipedia/en/7/7d/Lenna_%28test_image%29.png" -O lenna.jpg
$ python2 test.py lenna.jpg
$ python3 test.py lenna.jpg

WARNING: Users of boards with 1GB of memory
Compiling is very memory intensive, you will likely need to increase your swap size. Assuming you have a reasonably large SD card (>16GB to be safe), follow the procedure below to increase your swap size from the default 100MB to 2GB
$ sudo dphys-swapfile swapoff
$ sudo sed -i 's:CONF_SWAPSIZE=.*:CONF_SWAPSIZE=2048:g' /etc/dphys-swapfile
$ sudo reboot

  
## build-opencv.sh
#!/usr/bin/env bash
set -ex

OPENCV_VERSION=4.1.2
pushd ~/opencv/opencv-$OPENCV_VERSION
mkdir -p build
pushd build
MEM="$(free -m | awk /Mem:/'{print $2}')"  # Total memory in MB
# RPI 4 with 4GB RAM is actually 3906MB RAM after factoring in GPU RAM split.
# We're probably good to go with `-j $(nproc)` with 3GB or more RAM.
if [[ $MEM -ge 3000 ]]; then
  NUM_JOBS=$(nproc)
else
  NUM_JOBS=1 # Earlier versions of the Pi don't have sufficient RAM to support compiling with multiple jobs.
fi

# -D ENABLE_PRECOMPILED_HEADERS=OFF
# is a fix for https://github.com/opencv/opencv/issues/14868

# -D OPENCV_EXTRA_EXE_LINKER_FLAGS=-latomic
# is a fix for https://github.com/opencv/opencv/issues/15192

cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-$OPENCV_VERSION/modules \
      -D OPENCV_ENABLE_NONFREE=ON \
      -D BUILD_PERF_TESTS=OFF \
      -D BUILD_TESTS=OFF \
      -D BUILD_DOCS=ON \
      -D BUILD_EXAMPLES=ON \
      -D ENABLE_PRECOMPILED_HEADERS=OFF \
      -D WITH_TBB=ON \
      -D WITH_OPENMP=ON \
      -D ENABLE_NEON=ON \
      -D ENABLE_VFPV3=ON \
      -D OPENCV_GENERATE_PKGCONFIG=YES \
      -D OPENCV_EXTRA_EXE_LINKER_FLAGS=-latomic \
      -D PYTHON3_EXECUTABLE=$(which python3) \
      -D PYTHON_EXECUTABLE=$(which python2) \
      ..
make -j "$NUM_JOBS"
popd; popd

## download-opencv.sh
#!/usr/bin/env bash
set -ex

OPENCV_VERSION=4.1.2
cd ~
mkdir -p opencv && pushd opencv

wget -O "opencv-${OPENCV_VERSION}.tar.gz" "https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.tar.gz"
wget -O "opencv_contrib-${OPENCV_VERSION}.tar.gz" "https://github.com/opencv/opencv_contrib/archive/${OPENCV_VERSION}.tar.gz"
tar -xvf "opencv-${OPENCV_VERSION}.tar.gz"
tar -xvf "opencv_contrib-${OPENCV_VERSION}.tar.gz"
popd

## install-deps.sh
#!/usr/bin/env bash
set -ex

sudo apt-get purge -y libreoffice*
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get dist-upgrade -y
sudo apt-get autoremove -y
# For some reason I couldn't install libgtk2.0-dev or libgtk-3-dev without running the
# following line
# See https://www.raspberrypi.org/forums/viewtopic.php?p=1254646#p1254665 for issue and resolution
sudo apt-get install -y devscripts debhelper cmake libldap2-dev libgtkmm-3.0-dev libarchive-dev \
                        libcurl4-openssl-dev intltool
sudo apt-get install -y build-essential cmake pkg-config libjpeg-dev libtiff5-dev libjasper-dev \
                        libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
                        libxvidcore-dev libx264-dev libgtk2.0-dev libgtk-3-dev \
                        libatlas-base-dev libblas-dev libeigen{2,3}-dev liblapack-dev \
                        gfortran \
                        python2.7-dev python3-dev python-pip python3-pip python python3
sudo pip2 install -U pip
sudo pip3 install -U pip
sudo pip2 install numpy
sudo pip3 install numpy

## test.py
import numpy as np
import cv2
import sys

if len(sys.argv) < 2:
    print("USAGE: {} img-file".format(sys.argv[0]))
    sys.exit(1)

# Load an color image in grayscale
img = cv2.imread(sys.argv[1],0)
cv2.imshow('image',img)
cv2.waitKey(5000)
cv2.destroyAllWindows()
	#!/usr/bin/env bash
	set -ex

	OPENCV_VERSION=4.1.2
	pushd ~/opencv/opencv-$OPENCV_VERSION
	mkdir -p build
	pushd build
	MEM="$(free -m \| awk /Mem:/'{print $2}')" # Total memory in MB
	# RPI 4 with 4GB RAM is actually 3906MB RAM after factoring in GPU RAM split.
	# We're probably good to go with `-j $(nproc)` with 3GB or more RAM.
	if [[ $MEM -ge 3000 ]]; then
	NUM_JOBS=$(nproc)
	else
	NUM_JOBS=1 # Earlier versions of the Pi don't have sufficient RAM to support compiling with multiple jobs.
	fi

	# -D ENABLE_PRECOMPILED_HEADERS=OFF
	# is a fix for https://github.com/opencv/opencv/issues/14868

	# -D OPENCV_EXTRA_EXE_LINKER_FLAGS=-latomic
	# is a fix for https://github.com/opencv/opencv/issues/15192

	cmake -D CMAKE_BUILD_TYPE=RELEASE \
	-D CMAKE_INSTALL_PREFIX=/usr/local \
	-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-$OPENCV_VERSION/modules \
	-D OPENCV_ENABLE_NONFREE=ON \
	-D BUILD_PERF_TESTS=OFF \
	-D BUILD_TESTS=OFF \
	-D BUILD_DOCS=ON \
	-D BUILD_EXAMPLES=ON \
	-D ENABLE_PRECOMPILED_HEADERS=OFF \
	-D WITH_TBB=ON \
	-D WITH_OPENMP=ON \
	-D ENABLE_NEON=ON \
	-D ENABLE_VFPV3=ON \
	-D OPENCV_GENERATE_PKGCONFIG=YES \
	-D OPENCV_EXTRA_EXE_LINKER_FLAGS=-latomic \
	-D PYTHON3_EXECUTABLE=$(which python3) \
	-D PYTHON_EXECUTABLE=$(which python2) \
	..
	make -j "$NUM_JOBS"
	popd; popd
	#!/usr/bin/env bash
	set -ex

	sudo apt-get purge -y libreoffice*
	sudo apt-get clean
	sudo apt-get update
	sudo apt-get upgrade -y
	sudo apt-get dist-upgrade -y
	sudo apt-get autoremove -y
	# For some reason I couldn't install libgtk2.0-dev or libgtk-3-dev without running the
	# following line
	# See https://www.raspberrypi.org/forums/viewtopic.php?p=1254646#p1254665 for issue and resolution
	sudo apt-get install -y devscripts debhelper cmake libldap2-dev libgtkmm-3.0-dev libarchive-dev \
	libcurl4-openssl-dev intltool
	sudo apt-get install -y build-essential cmake pkg-config libjpeg-dev libtiff5-dev libjasper-dev \
	libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
	libxvidcore-dev libx264-dev libgtk2.0-dev libgtk-3-dev \
	libatlas-base-dev libblas-dev libeigen{2,3}-dev liblapack-dev \
	gfortran \
	python2.7-dev python3-dev python-pip python3-pip python python3
	sudo pip2 install -U pip
	sudo pip3 install -U pip
	sudo pip2 install numpy
	sudo pip3 install numpy
	import numpy as np
	import cv2
	import sys

	if len(sys.argv) < 2:
	print("USAGE: {} img-file".format(sys.argv[0]))
	sys.exit(1)

	# Load an color image in grayscale
	img = cv2.imread(sys.argv[1],0)
	cv2.imshow('image',img)
	cv2.waitKey(5000)
	cv2.destroyAllWindows()