opencv 3.0 rc1, example source code for surf and matching (gpu version)

This code is SURF and Matching test in opencv 3.0 rc1.

Especially, for using surf class, we have to add extra library when build opencv 3.0 rc1.
The extra lib is opened in github named opencv_contrib.

refer to this page.

surf(gpu version) is included in xfeatures2d/cuda.hpp
and cpu version is xfeatures2d/nonfree.hpp

As we know, surf, sift are still nonfree. very not good!..-.-

necessary dlls


Now, refer this example code.
This cod is converted from

#include < stdio.h>  
#include < iostream>  

#include < opencv2\opencv.hpp>  
#include < opencv2\core.hpp>
#include < opencv2\highgui.hpp> 
#include < opencv2\cudaarithm.hpp>
#include < opencv2\xfeatures2d\cuda.hpp>
#include < opencv2\cudafeatures2d.hpp>
//#include < opencv2\xfeatures2d\nonfree.hpp>

#ifdef _DEBUG          
#pragma comment(lib, "opencv_core300d.lib")
#pragma comment(lib, "opencv_highgui300d.lib")  
#pragma comment(lib, "opencv_imgcodecs300d.lib")
#pragma comment(lib, "opencv_cudafeatures2d300d.lib")
#pragma comment(lib, "opencv_xfeatures2d300d.lib")
#pragma comment(lib, "opencv_features2d300d.lib")
#pragma comment(lib, "opencv_core300.lib")
#pragma comment(lib, "opencv_highgui300.lib")
#pragma comment(lib, "opencv_imgcodecs300.lib")
#pragma comment(lib, "opencv_cudafeatures2d300.lib")
#pragma comment(lib, "opencv_xfeatures2d300.lib")
#pragma comment(lib, "opencv_features2d300.lib")

using namespace cv;
using namespace std;

void main()

 cuda::GpuMat img1(imread("M:\\____videoSample____\\Image\\A2.jpg", CV_LOAD_IMAGE_GRAYSCALE));
 cuda::GpuMat img2(imread("M:\\____videoSample____\\Image\\A3.jpg", CV_LOAD_IMAGE_GRAYSCALE));

 unsigned long t_AAtime = 0, t_BBtime = 0;
 float t_pt;
 float t_fpt;
 t_AAtime = getTickCount();

 cuda::SURF_CUDA surf(400); 
 // detecting keypoints & computing descriptors   
 cuda::GpuMat keypoints1GPU, keypoints2GPU;
 cuda::GpuMat descriptors1GPU, descriptors2GPU;
 surf(img1, cuda::GpuMat(), keypoints1GPU, descriptors1GPU);
 surf(img2, cuda::GpuMat(), keypoints2GPU, descriptors2GPU);

 cout << "FOUND " << keypoints1GPU.cols << " keypoints on first image" << endl;
 cout << "FOUND " << keypoints2GPU.cols << " keypoints on second image" << endl;

 // matching descriptors   
 vector< vector< DMatch> > matches;
 Ptr< cuda::DescriptorMatcher > matcher = cuda::DescriptorMatcher::createBFMatcher();
 matcher->knnMatch(descriptors1GPU, descriptors2GPU, matches, 2);

 // downloading results  Gpu -> Cpu  
 vector< KeyPoint> keypoints1, keypoints2;
 vector< float> descriptors1, descriptors2;
 surf.downloadKeypoints(keypoints1GPU, keypoints1);
 surf.downloadKeypoints(keypoints2GPU, keypoints2);
 //surf.downloadDescriptors(descriptors1GPU, descriptors1);   
 //surf.downloadDescriptors(descriptors2GPU, descriptors2);  

 vector< KeyPoint> matchingKey1, matchingKey2;
 std::vector< DMatch > good_matches;
 for (int k = 0; k < min(descriptors1GPU.rows - 1, (int)matches.size()); k++)
  if ((matches[k][0].distance < 0.6*(matches[k][1].distance)) && ((int)matches[k].size() <= 2 && (int)matches[k].size()>0))


 t_BBtime = getTickCount();
 t_pt = (t_BBtime - t_AAtime) / getTickFrequency();
 t_fpt = 1 / t_pt;
 printf("feature extraction = %.4lf / %.4lf \n", t_pt, t_fpt);

 // drawing the results   
 Mat img_matches;
 Mat img11, img22;;;

 //drawMatches(img11, matchingKey1, img22, matchingKey2, good_matches, img_matches);   
 drawMatches(img11, keypoints1, img22, keypoints2, good_matches, img_matches);

 namedWindow("matches", 0);
 imshow("matches", img_matches);



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