Dlib库【9】——Surf特征点

配置Dlib环境：  链接

效果如图所示：

感觉Slam里会用得比较多，图片旋转平移之后取surf特征点连线…………

代码如下：

// 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.  Itpulls out SURF points from an input image and displays them on the screen as an overlayon 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 FeaturesBy Herbert Bay, Tinne Tuytelaars, and Luc Van GoolThis paper provides a nice detailed overview of how the algorithm works:Notes on the OpenSURF Library by Christopher Evans*/#define DLIB_JPEG_SUPPORT#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 programif (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;}}//  ----------------------------------------------------------------------------

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