mirror of https://github.com/davisking/dlib.git
83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
|
|
/*
|
|
|
|
This is a simple example illustrating the use of the get_surf_points() function. It
|
|
pulls out SURF points from an input image and displays them on the screen as an overlay
|
|
on the image.
|
|
|
|
For a description of the SURF algorithm you should consult the following papers:
|
|
This is the original paper which introduced the algorithm:
|
|
SURF: Speeded Up Robust Features
|
|
By Herbert Bay, Tinne Tuytelaars, and Luc Van Gool
|
|
|
|
This paper provides a nice detailed overview of how the algorithm works:
|
|
Notes on the OpenSURF Library by Christopher Evans
|
|
|
|
*/
|
|
|
|
|
|
|
|
#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)
|
|
{
|
|
try
|
|
{
|
|
// make sure the user entered an argument to this program
|
|
if (argc != 2)
|
|
{
|
|
cout << "error, you have to enter a BMP file as an argument to this program" << endl;
|
|
return 1;
|
|
}
|
|
|
|
// Here we declare an image object that can store rgb_pixels. Note that in dlib
|
|
// there is no explicit image object, just a 2D array and various pixel types.
|
|
array2d<rgb_pixel> img;
|
|
|
|
// Now load the image file into our image. If something is wrong then load_image()
|
|
// will throw an exception. Also, if you linked with libpng and libjpeg then
|
|
// load_image() can load PNG and JPEG files in addition to BMP files.
|
|
load_image(img, argv[1]);
|
|
|
|
// Get SURF points from the image. Note that get_surf_points() has some optional
|
|
// arguments that allow you to control the number of points you get back. Here we
|
|
// simply take the default.
|
|
std::vector<surf_point> sp = get_surf_points(img);
|
|
cout << "number of SURF points found: "<< sp.size() << endl;
|
|
|
|
if (sp.size() > 0)
|
|
{
|
|
// A surf_point object contains a lot of information describing each point.
|
|
// The most important fields are shown below:
|
|
cout << "center of first SURF point: "<< sp[0].p.center << endl;
|
|
cout << "pyramid scale: " << sp[0].p.scale << endl;
|
|
cout << "SURF descriptor: \n" << sp[0].des << endl;
|
|
}
|
|
|
|
// Create a window to display the input image and the SURF points. (Note that
|
|
// you can zoom into the window by holding CTRL and scrolling the mouse wheel)
|
|
image_window my_window(img);
|
|
draw_surf_points(my_window, sp);
|
|
|
|
// wait until the user closes the window before we let the program
|
|
// terminate.
|
|
my_window.wait_until_closed();
|
|
}
|
|
catch (exception& e)
|
|
{
|
|
cout << "exception thrown: " << e.what() << endl;
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|