Dlib C++ Library に付属のサンプルプログラムで顔検出を行う（Ubuntu 上）

sudo apt -y update
sudo apt -yV upgrade
sudo /sbin/shutdown -r now

sudo apt install libx11-dev

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

using namespace dlib;
using namespace std;

int main(int argc, char** argv)
{  
  frontal_face_detector detector = get_frontal_face_detector();
  array2d<unsigned char> img;
  load_image(img, argv[2]);
  pyramid_up(img);
  std::vector<rectangle> dets = detector(img);
  std::vector<rectangle>::iterator it;
  for( it = dets.begin(); it != dets.end(); it++ )
    cout << *it << endl; 

  if ( atoi(argv[1]) != 0 ) {
    image_window win;
    win.clear_overlay();
    win.set_image(img);
    win.add_overlay(dets, rgb_pixel(255,0,0));
    cin.get();
  }
}

g++ -I/usr/local/include a.c -L/usr/local/lib -ldlib -lpthread -lX11
./a.out 0 2007_007763.jpg
./a.out 1 2007_007763.jpg