With all default opencv + opencv_contrib build (vs2013), it seems that the mentioned class is abstract.
Test code:
#include <opencv2\core.hpp>
#include <opencv2\features2d.hpp>
#include <opencv2\xfeatures2d\nonfree.hpp>
//the corresponding libraries are linked
int main()
{
cv::Mat m;
cv::xfeatures2d::SURF surf;
return 0;
}
Error:
Error 1 error C2259: 'cv::xfeatures2d::SURF' : cannot instantiate abstract class c:\documents\visual studio 2013\projects\xfeattest\xfeattest\main.cpp 8 1 xfeatTest
2 IntelliSense: object of abstract class type "cv::xfeatures2d::SURF" is not allowed:
function "cv::xfeatures2d::SURF::setHessianThreshold" is a pure virtual function
function "cv::xfeatures2d::SURF::getHessianThreshold" is a pure virtual function
function "cv::xfeatures2d::SURF::setNOctaves" is a pure virtual function
The nonfree.hpp:
#ifndef __OPENCV_XFEATURES2D_FEATURES_2D_HPP__
#define __OPENCV_XFEATURES2D_FEATURES_2D_HPP__
#include "opencv2/features2d.hpp"
namespace cv
{
namespace xfeatures2d
{
/*!
SIFT implementation.
The class implements SIFT algorithm by D. Lowe.
*/
class CV_EXPORTS_W SIFT : public Feature2D
{
public:
CV_WRAP static Ptr<SIFT> create( int nfeatures = 0, int nOctaveLayers = 3,
double contrastThreshold = 0.04, double edgeThreshold = 10,
double sigma = 1.6);
};
typedef SIFT SiftFeatureDetector;
typedef SIFT SiftDescriptorExtractor;
/*!
SURF implementation.
The class implements SURF algorithm by H. Bay et al.
*/
class CV_EXPORTS_W SURF : public Feature2D
{
public:
CV_WRAP static Ptr<SURF> create(double hessianThreshold=100,
int nOctaves = 4, int nOctaveLayers = 3,
bool extended = false, bool upright = false);
CV_WRAP virtual void setHessianThreshold(double hessianThreshold) = 0;
CV_WRAP virtual double getHessianThreshold() const = 0;
CV_WRAP virtual void setNOctaves(int nOctaves) = 0;
CV_WRAP virtual int getNOctaves() const = 0;
CV_WRAP virtual void setNOctaveLayers(int nOctaveLayers) = 0;
CV_WRAP virtual int getNOctaveLayers() const = 0;
CV_WRAP virtual void setExtended(bool extended) = 0;
CV_WRAP virtual bool getExtended() const = 0;
CV_WRAP virtual void setUpright(bool upright) = 0;
CV_WRAP virtual bool getUpright() const = 0;
};
typedef SURF SurfFeatureDetector;
typedef SURF SurfDescriptorExtractor;
}
} /* namespace cv */
#endif
Any idea what the problem could be?
