我尝试在 BFMatcher 上实现 knnMatch,如下所示:
BFMatcher matcher(NORM_L2, true);
vector<DMatch> matches;
//matcher.match(descriptors1, descriptors2, matches);
matcher.knnMatch(descriptors1, descriptors2, matches, 2);
并收到以下错误:
fiducialMain.cpp: In function ‘void fiducialCalc(cv::Mat, cv::Mat, cv::Mat&, cv::Mat&, int&)’:
fiducialMain.cpp:98:56: error: no matching function for call to ‘cv::BFMatcher::knnMatch(cv::Mat&, cv::Mat&, std::vector<cv::DMatch>&, int)’
matcher.knnMatch(descriptors1, descriptors2, matches,2);
^
fiducialMain.cpp:98:56: note: candidates are:
In file included from fiducialMain.cpp:15:0:
/usr/local/include/opencv2/features2d/features2d.hpp:1116:18: note: void cv::DescriptorMatcher::knnMatch(const cv::Mat&, const cv::Mat&, std::vector<std::vector<cv::DMatch> >&, int, const cv::Mat&, bool) const
CV_WRAP void knnMatch( const Mat& queryDescriptors, const Mat& trainDescriptors,
^
/usr/local/include/opencv2/features2d/features2d.hpp:1116:18: note: no known conversion for argument 3 from ‘std::vector<cv::DMatch>’ to ‘std::vector<std::vector<cv::DMatch> >&’
/usr/local/include/opencv2/features2d/features2d.hpp:1130:18: note: void cv::DescriptorMatcher::knnMatch(const cv::Mat&, std::vector<std::vector<cv::DMatch> >&, int, const std::vector<cv::Mat>&, bool)
CV_WRAP void knnMatch( const Mat& queryDescriptors, CV_OUT vector<vector<DMatch> >& matches, int k,
^
/usr/local/include/opencv2/features2d/features2d.hpp:1130:18: note: no known conversion for argument 2 from ‘cv::Mat’ to ‘std::vector<std::vector<cv::DMatch> >&’
谁能解释这个错误?
最佳答案
请再看看the docs
而普通的匹配函数有一个vector<DMatch>
结果,
knnMatch(大声说:k-nearest-neighbours!)产生几个(k)个 vector ,因此你需要一个:
vector < vector
结果
关于c++ - BFMatcher knnMatch,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28729880/