Dlib C++ Library に付属のサンプルプログラムで SURF を求める（Ubuntu 上）

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

sudo apt install libx11-dev

curl -L https://github.com/opencv/opencv/blob/master/samples/data/fruits.jpg?raw=true -o fruits.jpg
curl -L https://github.com/opencv/opencv/blob/master/samples/data/home.jpg?raw=true -o home.jpg

#include<dlib/image_keypoint/draw_surf_points.h>
#include<dlib/image_io.h>
#include<dlib/image_keypoint.h>
#include<fstream>

using namespace std;
using namespace dlib;

int main(int argc, char** argv)
{
        array2d<rgb_pixel> img;
        load_image(img, argv[2]);


        std::vector<surf_point> sp = get_surf_points(img);
        cout << "number of SURF points found: "<< sp.size() << endl;

	std::vector<surf_point>::iterator it;
	for( it = sp.begin(); it != sp.end(); it++ )
        {
            cout << "center of first SURF point: "<< it->p.center << endl;
            cout << "pyramid scale:     " << it->p.scale << endl;
            cout << "SURF descriptor: \n" << it->des << endl;
        }

	if ( atoi(argv[1]) != 0 ) {
	  image_window my_window(img);
	  draw_surf_points(my_window, sp);
	  my_window.wait_until_closed();
	}
}

g++ -I/usr/local/include a.c -L/usr/local/lib -ldlib -lpthread -lX11
./a.out 0 home.jpg 
./a.out 0 fruits.jpg 

./a.out 1 home.jpg 
./a.out 1 fruits.jpg