I note the FlannBasedMatcher::match have a parameter mask, so I give a try with following code:
#include<opencv.hpp>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/calib3d/calib3d.hpp"
#include "opencv2/nonfree/nonfree.hpp"
using namespace cv;
using namespace std;
int main() {
Mat rightImg = imread("right.jpg", 0);
Mat leanImg = imread("lean.jpg", 0);
if (!rightImg.data || !leanImg.data) {
cout << "Fail to read your image. Please check your path.\n";
return -1;
}
resize(leanImg, leanImg, rightImg.size());
int minHessian = 400;
SurfFeatureDetector detector(minHessian);
vector<KeyPoint> keypoints_right, keypoints_lean;
detector.detect(rightImg, keypoints_right);
detector.detect(leanImg, keypoints_lean);
Mat med_right, med_lean;
drawKeypoints(rightImg, keypoints_right, med_right);
drawKeypoints(leanImg, keypoints_lean, med_lean);
SurfDescriptorExtractor extractor;
Mat descriptors_right, descriptors_lean;
extractor.compute(rightImg, keypoints_right, descriptors_right);
extractor.compute(leanImg, keypoints_lean, descriptors_lean);
FlannBasedMatcher matcher;
vector< DMatch > matches;
Mat mask(rightImg.size(), CV_8UC1, Scalar(255));
ellipse(mask, Point(rightImg.cols / 2, rightImg.rows / 2), Size(rightImg.cols / 2.5, rightImg.rows / 2.5), 0, 0, 360, Scalar(0), CV_FILLED);
matcher.match(descriptors_right, descriptors_lean, matches/*, mask*/);// You can use the mask or not to test
Mat img_matches;
drawMatches(rightImg, keypoints_right, leanImg, keypoints_lean,
matches, img_matches, Scalar::all(-1), Scalar::all(-1),
vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS);
return 0;
}
And this is my right.jpg and lean.jpg. But I note I will get a same result whether I use the mask in the FlannBasedMatcher::match.You can use the mask or not to test. Is there I have missed something or the OpenCV have a bug in my 2.4.13?
