Install Precompiled Dlib on Raspberry Pi

Dlib is an open-source library that provides machine learning algorithms and tools for solving classification, regression, and clustering problems. This tutorial demonstrates how to install precompiled Dlib on Raspberry Pi.

Install Dlib

Connect to Raspberry Pi via SSH. Download the .deb package from releases page of the repository using the following command:

curl -sSLo dlib.deb https://github.com/prepkg/dlib-raspberrypi/releases/latest/download/dlib-aarch64-linux-gnu.deb

Once the download is complete, run the command to install Dlib:

sudo apt install -y ./dlib.deb

The .deb package is no longer necessary, remove it:

rm -rf dlib.deb

Testing Dlib

To test program compilation, install GNU C++ compiler:

sudo apt install -y g++

Download a test image from the Internet:

curl -sSLo test.jpg https://raw.githubusercontent.com/ageitgey/face_recognition/master/examples/two_people.jpg

Create a main.cpp file:

nano main.cpp

Add the following code:

#include <dlib/image_processing/frontal_face_detector.h>
#include <dlib/image_io.h>

using namespace dlib;

int main() {
    array2d<rgb_pixel> img;
    load_image(img, "test.jpg");

    frontal_face_detector detector = get_frontal_face_detector();
    std::vector<rectangle> bboxes = detector(img);

    for (unsigned int i = 0; i < bboxes.size(); i++) {
        draw_rectangle(img, bboxes[i], rgb_pixel(0, 255, 0), 3);
    }

    save_jpeg(img, "result.jpg");

    return 0;
}

The code is used to detect faces in an image and draw a bounding box around the detected faces. The final image is saved to a file.

Execute the following command to compile a code:

g++ main.cpp -o test -O3 -Wno-psabi -ldlib

Run a program:

./test

Here is result:

Uninstall Dlib

If decided to completely remove Dlib and related dependencies, run the following command:

sudo apt purge --autoremove -y dlib