Difference between revisions of "Explorer/RaspberryPi/Visualprocessing/Opencv"
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| Line 52: | Line 52: | ||
>>> cv2.__version__ | >>> cv2.__version__ | ||
'4.3.0' | '4.3.0' | ||
#include <opencv2/opencv.hpp> | |||
#define WIDTH 640 | |||
#define HEIGHT 480 | |||
#define FPS 30 | |||
#define SCALE 3/2 | |||
using namespace cv; | |||
using namespace std; | |||
int main(int, char**) | |||
{ | |||
unsigned int dataSize = sizeof(unsigned char)*WIDTH*HEIGHT*SCALE; | |||
Mat imageIn(WIDTH*SCALE, HEIGHT, CV_8UC1); | |||
Mat imageOut(WIDTH,HEIGHT,CV_8UC3,Scalar(0,0,0)); | |||
cout << getBuildInformation() << endl; | |||
string streamInGstStr="shmsrc socket-path=/tmp/camera2 ! video/x-raw,width="+to_string(WIDTH)+ | |||
",height="+to_string(HEIGHT)+",framerate="+to_string(FPS)+"/1,format=I420 ! appsink sync=true"; | |||
string streamOutGstStr="appsrc ! shmsink socket-path=/tmp/camera3 wait-for-connection=false async=false sync=false"; | |||
VideoCapture streamIn(streamInGstStr,CAP_GSTREAMER); | |||
VideoWriter streamOut(streamOutGstStr,0,FPS/1,Size(WIDTH,HEIGHT),true); | |||
if (streamIn.isOpened() && streamOut.isOpened()) { | |||
while (true) { | |||
streamIn.read(imageIn); | |||
if (!imageIn.empty()) { | |||
memcpy(imageOut.data,imageIn.data,dataSize); | |||
streamOut.write(imageOut); | |||
} | |||
} | |||
} | |||
return 0; | |||
} | |||
g++ -g test.cpp -o test `pkg-config --cflags --libs opencv4` | |||
rm /tmp/camera3;./test | |||
Revision as of 10:26, 26 June 2020
- Installation
PIZero installation > 10 hours
PI3 installation > 4 hours
sudo apt-get install -y cmake sudo apt-get install -y python-numpy python3-numpy libpython-dev libpython3-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libtiff-dev zlib1g-dev libjpeg-dev libpng-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev sudo apt-get install -y libatlas-base-dev gfortran
for raspberry pi3 sudo apt-get install -y libgtk2.0-dev
git clone https://github.com/opencv/opencv.git git clone https://github.com/opencv/opencv_contrib.git cd ~/opencv git checkout 4.3.0 cd ~/opencv_contrib git checkout 4.3.0
mkdir ~/opencv/build cd ~/opencv/build cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D INSTALL_PYTHON_EXAMPLES=OFF \ -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \ -D OPENCV_GENERATE_PKGCONFIG=YES \ -D BUILD_TESTS=OFF \ -D BUILD_PERF_TESTS=OFF \ -D BUILD_EXAMPLES=OFF ..
=> GStreamer: YES (1.14.4)
/etc/dphys-swapfile CONF_SWAPSIZE=2048 sudo /etc/init.d/dphys-swapfile stop sudo /etc/init.d/dphys-swapfile start
make & for raspberrypi3: make -j4&
sudo make install sudo ldconfig -v
- Check installation
python3 Python 3.7.3 (default, Dec 20 2019, 18:57:59) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 >>> cv2.__version__ '4.3.0'
#include <opencv2/opencv.hpp> #define WIDTH 640 #define HEIGHT 480 #define FPS 30 #define SCALE 3/2 using namespace cv; using namespace std;
int main(int, char**)
{
unsigned int dataSize = sizeof(unsigned char)*WIDTH*HEIGHT*SCALE;
Mat imageIn(WIDTH*SCALE, HEIGHT, CV_8UC1);
Mat imageOut(WIDTH,HEIGHT,CV_8UC3,Scalar(0,0,0));
cout << getBuildInformation() << endl;
string streamInGstStr="shmsrc socket-path=/tmp/camera2 ! video/x-raw,width="+to_string(WIDTH)+ ",height="+to_string(HEIGHT)+",framerate="+to_string(FPS)+"/1,format=I420 ! appsink sync=true"; string streamOutGstStr="appsrc ! shmsink socket-path=/tmp/camera3 wait-for-connection=false async=false sync=false";
VideoCapture streamIn(streamInGstStr,CAP_GSTREAMER); VideoWriter streamOut(streamOutGstStr,0,FPS/1,Size(WIDTH,HEIGHT),true);
if (streamIn.isOpened() && streamOut.isOpened()) {
while (true) {
streamIn.read(imageIn);
if (!imageIn.empty()) {
memcpy(imageOut.data,imageIn.data,dataSize);
streamOut.write(imageOut);
}
}
}
return 0;
}
g++ -g test.cpp -o test `pkg-config --cflags --libs opencv4` rm /tmp/camera3;./test