JackyFWong/vectorizer

Calculates distance between two points in real time via OpenCV on a RPi

vectorizer

Calculates distance between two points in real time via OpenCV on Rasperry Pi with C++.

Dependencies

Install OpenCV. Install hdf5 and vtk if your system doesn't it (e.g. Arch Linux).

Instructions for Arch Linux...

pacman -S opencv
pacman -S hdf5
pacman -S vtk

Instructions for doing it manually on the RPi are located here and here

sudo apt-get update && sudo apt-get upgrade
sudo apt-get install build-essential cmake unzip pkg-config
sudo apt-get install libjpeg-dev libtiff-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libgtk-3-dev
sudo apt-get install libcanberra-gtk*
sudo apt-get install libatlas-base-dev gfortran

Now we get OpenCV itself...

cd ~
wget -O opencv.zip https://github.com/opencv/opencv/archive/4.0.0.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.0.0.zip
unzip opencv.zip
unzip opencv_contrib.zip
mv opencv-4.0.0 opencv
mv opencv_contrib-4.0.0 opencv_contrib

Compiling OpenCV

cd ~/opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
    -D ENABLE_NEON=ON \
    -D ENABLE_VFPV3=ON \
    -D BUILD_TESTS=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D INSTALL_PYTHON_EXAMPLES=OFF \
    -D BUILD_EXAMPLES=OFF ..

The guide mentions increasing the swap size on your RPi. Do so.

sudo vim /etc/dphys-swapfile

Then, set CONF_SWAPSIZE to 2048 and restart swap

sudo /etc/init.d/dphys-swapfile stop
sudo /etc/init.d/dphys-swapfile start

Finally, for the multi-hour part,

make
sudo make install
sudo ldconfig

Reset the swap size back to 100 once you're finished.

Install the raspicam library afterwards.

git clone https://github.com/cedricve/raspicam .
cd raspicam
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

Using the program

Compile the program on your RPi. If you haven't created the build folder, do so. The CMakeLists.txt should be good. This needs to be done only once.

cd live/build
cmake ..

Compile every time afterwards.

cd live/build
make

Execute live/build/video for the program.

Have the program execute on startup

We will be be using rc.local to run the program during boot.

Edit the rc.local file

sudo vim /etc/rc.local

Add the command to execute the program from root. in the file.

sudo /[path-to-repo-folder]/vectorizer/live/build/video &

Such as ./home/pi/vectorizer/live/build/video &. The ampersand is required because the program runs continuously. Ensure that

exit 0

is at the end of the file.

Recommended!

If you want the debug output to be saved to a file, the line should be

sudo bash -c '/[path]/vectorizer/live/build/video > /home/pi/debug-log.txt 2>&1' &