Anyone know how to call knnMatch in version 2.4.10?
I used it in this way, but it doesn't work and met errors. Anyone know how to use it?
std::vector< DMatch > matches;
BFMatcher matcher(NORM_L2, true);
Mat mask;
matcher.knnMatch(descriptors_1, descriptors_2, matches, 2, mask, false); // Find two nearest matches
Finally, I solved the problem by changing the declaration of matches :
to be:
vector<vector<DMatch>> matches;
Well, for knnmatch you effectively need a vector of vector of knn match, since first you have the best Dmatch for a specific keypoint pair, then you have a vector for all Dmatchs of the image, then a second vector allowing you to store the second best matches with the same structure
This said, beside the change you show in this answer, is the code present in the question works correctly now?
Taking a look at the current knnMatch documentation I guess the matcher interface was changed.
It seems that since 2.4.10 you need to use the pointer interface. Something like this should work
Ptr<DescriptorMatcher> matcher;
matcher->create("BruteForce");
Mat mask;
matcher -> knnMatch(descriptors_1, descriptors_2, matches, 2, mask, false); // Find two nearest matches
Can you check the result?
Nope, It was a suggestion. Can you give us the error that was generated by this code?
Line of code please, where is this error generated.
Asked: 2015-01-28 02:58:39 -0600
Seen: 569 times
Last updated: Feb 09 '15
