Hey guys,

This post is about building your own Raspberry Pi face recognition service.

Hardware prerequisites:

– A working Raspberry Pi (I’ve used model 3+, the fastest on the market at the time of writing this article) with a 2.5A charger, a 16 Gb SD-card, HDMI cable
– Any USB webcam
– Optional: an Arduino like motion sensor

Note: this setup might work on older versions of the Pi, however the overall performance might be impacted!

Software prerequisites:

– You will need latest version of Raspbian installed on the Pi
– WiFi or Ethernet working and configured to your local network.

Run sudo raspi-config and configure the basics:
– Set up your keyboard layout (It defaults to a British keyboard layout)
– Change default user password
– Enable the Raspberry Pi camera (if you have one attached)
– Configure gpu memory split under ‘Advanced’. Set it up ’16’.
– Save changes and reboot.

Install required libraries with these commands:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential \
cmake \
gfortran \
git \
wget \
curl \
graphicsmagick \
libgraphicsmagick1-dev \
libatlas-dev \
libavcodec-dev \
libavformat-dev \
libboost-all-dev \
libgtk2.0-dev \
libjpeg-dev \
liblapack-dev \
libswscale-dev \
pkg-config \
python3-dev \
python3-numpy \
python3-pip \
sudo apt-get clean

Install the picamera python library with array support (if you are using a camera):

sudo apt-get install python3-picamera
sudo pip3 install --upgrade picamera[array]

Temporarily enable a larger swap file size (so the dlib compile won’t fail due to limited memory):

sudo nano /etc/dphys-swapfile

< change CONF_SWAPSIZE=100 to CONF_SWAPSIZE=1024 and save / exit nano >

sudo /etc/init.d/dphys-swapfile restart

Download and install dlib v19.6:

mkdir -p dlib
git clone -b 'v19.6' --single-branch https://github.com/davisking/dlib.git dlib/
cd ./dlib
sudo python3 setup.py install --compiler-flags "-mfpu=neon"

Install face_recognition:

sudo pip3 install face_recognition

Revert the swap file size change now that dlib is installed:

sudo nano /etc/dphys-swapfile

< change CONF_SWAPSIZE=1024 to CONF_SWAPSIZE=100 and save / exit nano >

sudo /etc/init.d/dphys-swapfile restart

Download the face recognition code examples:

git clone --single-branch https://github.com/ageitgey/face_recognition.git

Last step! Running our stuff!
cd ./face_recognition/examples
python3 facerec_on_raspberry_pi.py

Totally Optional: If you want a desktop GUI, install PIXEL:

sudo apt-get install --no-install-recommends xserver-xorg xinit raspberrypi-ui-mods

Once you run the script, the end result should look something like this:

Thanks to Adam Geitgey for creating his really nice Python library, which you can find in his Github account.


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