我正在编写一个代码,通过在OPENCV中使用SURF从2个图像中提取特征及其描述符。描述符用于匹配两个图像的特征。为了计算最佳匹配,我计算了dotproduct并找出两个特征描述符矩阵之间的角度。我在acos函数中遇到错误。我已经添加了代码和下面的错误..opencv中的acos函数错误
任何人都可以在程序中提示错误。
int main(int argc, char** argv)
{
//-- Step 1: Detect the keypoints using SURF Detector
int minHessian = 400;
SurfFeatureDetector detector(minHessian,1,3,false,true);
std::vector<KeyPoint> keypoints_1, keypoints_2;
detector.detect(img_1, keypoints_1);
detector.detect(img_2, keypoints_2);
// computing descriptors
SurfDescriptorExtractor extractor(minHessian,1,1,1,0);
Mat descriptors1, descriptors2;
extractor.compute(img_1, keypoints_1, descriptors1);
extractor.compute(img_2, keypoints_2, descriptors2);
std::cout << descriptors1.rows << std::endl;
std::cout << descriptors1.cols << std::endl;
std::cout << descriptors2.rows << std::endl;
std::cout << descriptors2.cols << std::endl;
Mat a;
Mat b(descriptors2.rows,descriptors2.cols, CV_32F);
a=descriptors1;
b=descriptors2;
Mat m;
if(((descriptors2.rows)||(descriptors1.rows))==0)
{
m.push_back(0);
return 0;
}
Mat des2t;
std::cout << des2t.rows << std::endl;
std::cout << des2t.cols << std::endl;
des2t= b.t();
std::cout << des2t.rows << std::endl;
std::cout << des2t.cols << std::endl;
m= Mat::zeros(descriptors1.rows,1,CV_32F);
Mat dotprod = a*des2t;
Mat angle ;
angle = std::acos(dotprod);
std::cout << dotprod.rows << std::endl;
std::cout << dotprod.cols << std::endl;
return 0;
}
错误:
In function ‘int main(int, char**)’:
surf.cpp:116:29: error: no matching function for call to ‘acos(cv::Mat&)’
surf.cpp:116:29: note: candidates are:
/usr/include/i386-linux-gnu/bits/mathcalls.h:55:1: note: double acos(double)
/usr/include/i386-linux-gnu/bits/mathcalls.h:55:1: note: no known conversion for argument 1 from ‘cv::Mat’ to ‘double’
/usr/include/c++/4.6/cmath:102:3: note: float std::acos(float)
/usr/include/c++/4.6/cmath:102:3: note: no known conversion for argument 1 from ‘cv::Mat’ to ‘float’
/usr/include/c++/4.6/cmath:106:3: note: long double std::acos(long double)
/usr/include/c++/4.6/cmath:106:3: note: no known conversion for argument 1 from ‘cv::Mat’ to ‘long double’
/usr/include/c++/4.6/cmath:112:5: note: template<class _Tp> typename __gnu_cxx::__enable_if<std::__is_integer<_Tp>::__value, double>::__type std::acos(_Tp)
make[2]: *** [CMakeFiles/surf.dir/surf.cpp.o] Error 1
make[1]: *** [CMakeFiles/surf.dir/all] Error 2
make: *** [all] Error 2
有没有什么方法可以将关键点的数量限制在100以内,并且根据它们的强度排列关键点? –