--- /dev/null
+#include <iostream>
+
+#include <opencv2/core/core.hpp>
+#include <opencv2/features2d/features2d.hpp>
+#include <opencv2/highgui/highgui.hpp>
+#include <opencv2/gpu/gpu.hpp>
+
+using namespace std;
+using namespace cv;
+using namespace cv::gpu;
+
+void help()
+{
+ cout << "\nThis program demonstrates using SURF_GPU features detector, descriptor extractor and BruteForceMatcher_GPU" << endl;
+ cout << "\nUsage:\n\tmatcher_simple_gpu <image1> <image2>" << endl;
+}
+
+int main(int argc, char* argv[])
+{
+ if (argc != 3)
+ {
+ help();
+ return -1;
+ }
+
+ GpuMat img1(imread(argv[1], CV_LOAD_IMAGE_GRAYSCALE));
+ GpuMat img2(imread(argv[2], CV_LOAD_IMAGE_GRAYSCALE));
+ if (img1.empty() || img2.empty())
+ {
+ cout << "Can't read one of the images" << endl;
+ return -1;
+ }
+
+ SURF_GPU surf;
+
+ // detecting keypoints & computing descriptors
+ GpuMat keypoints1GPU, keypoints2GPU;
+ GpuMat descriptors1GPU, descriptors2GPU;
+ surf(img1, GpuMat(), keypoints1GPU, descriptors1GPU);
+ surf(img2, GpuMat(), keypoints2GPU, descriptors2GPU);
+
+ // matching descriptors
+ BruteForceMatcher_GPU< L2<float> > matcher;
+ GpuMat trainIdx, distance;
+ matcher.matchSingle(descriptors1GPU, descriptors2GPU, trainIdx, distance);
+
+ // downloading results
+ vector<KeyPoint> keypoints1, keypoints2;
+ vector<float> descriptors1, descriptors2;
+ vector<DMatch> matches;
+ SURF_GPU::downloadKeypoints(keypoints1GPU, keypoints1);
+ SURF_GPU::downloadKeypoints(keypoints2GPU, keypoints2);
+ SURF_GPU::downloadDescriptors(descriptors1GPU, descriptors1);
+ SURF_GPU::downloadDescriptors(descriptors2GPU, descriptors2);
+ BruteForceMatcher_GPU< L2<float> >::matchDownload(trainIdx, distance, matches);
+
+ // drawing the results
+ Mat img_matches;
+ drawMatches(img1, keypoints1, img2, keypoints2, matches, img_matches);
+ imshow("matches", img_matches);
+ waitKey(0);
+
+ return 0;
+}